ChangeLogTag: Mon Nov 3 17:02:42 UTC 2003 Don Hinton <dhinton@dresystems.com>

30 files changed, 3995 insertions, 0 deletions

diff --git a/ace/TMCast/Export.hpp b/ace/TMCast/Export.hpp
new file mode 100644
index 00000000000..149a83cb785
--- /dev/null
+++ b/ace/TMCast/Export.hpp
@@ -0,0 +1,54 @@
+
+// -*- C++ -*-
+// $Id$
+// Definition for Win32 Export directives.
+// This file is generated automatically by generate_export_file.pl TMCast
+// ------------------------------
+#ifndef TMCAST_EXPORT_H
+#define TMCAST_EXPORT_H
+
+#include "ace/config-all.h"
+
+#if !defined (TMCAST_HAS_DLL)
+#  define TMCAST_HAS_DLL 1
+#endif /* ! TMCAST_HAS_DLL */
+
+#if defined (TMCAST_HAS_DLL) && (TMCAST_HAS_DLL == 1)
+#  if defined (TMCAST_BUILD_DLL)
+#    define TMCast_Export ACE_Proper_Export_Flag
+#    define TMCAST_SINGLETON_DECLARATION(T) ACE_EXPORT_SINGLETON_DECLARATION (T)
+#    define TMCAST_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK) ACE_EXPORT_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK)
+#  else /* TMCAST_BUILD_DLL */
+#    define TMCast_Export ACE_Proper_Import_Flag
+#    define TMCAST_SINGLETON_DECLARATION(T) ACE_IMPORT_SINGLETON_DECLARATION (T)
+#    define TMCAST_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK) ACE_IMPORT_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK)
+#  endif /* TMCAST_BUILD_DLL */
+#else /* TMCAST_HAS_DLL == 1 */
+#  define TMCast_Export
+#  define TMCAST_SINGLETON_DECLARATION(T)
+#  define TMCAST_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK)
+#endif /* TMCAST_HAS_DLL == 1 */
+
+// Set TMCAST_NTRACE = 0 to turn on library specific tracing even if
+// tracing is turned off for ACE.
+#if !defined (TMCAST_NTRACE)
+#  if (ACE_NTRACE == 1)
+#    define TMCAST_NTRACE 1
+#  else /* (ACE_NTRACE == 1) */
+#    define TMCAST_NTRACE 0
+#  endif /* (ACE_NTRACE == 1) */
+#endif /* !TMCAST_NTRACE */
+
+#if (TMCAST_NTRACE == 1)
+#  define TMCAST_TRACE(X)
+#else /* (TMCAST_NTRACE == 1) */
+#  if !defined (ACE_HAS_TRACE)
+#    define ACE_HAS_TRACE
+#  endif /* ACE_HAS_TRACE */
+#  define TMCAST_TRACE(X) ACE_TRACE_IMPL(X)
+#  include "ace/Trace.h"
+#endif /* (TMCAST_NTRACE == 1) */
+
+#endif /* TMCAST_EXPORT_H */
+
+// End of auto generated file.
diff --git a/ace/TMCast/FaultDetector.hpp b/ace/TMCast/FaultDetector.hpp
new file mode 100644
index 00000000000..ba476cbd367
--- /dev/null
+++ b/ace/TMCast/FaultDetector.hpp
@@ -0,0 +1,41 @@
+// file      : TMCast/FaultDetector.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#include "Protocol.hpp"
+
+namespace TMCast
+{
+  class FaultDetector
+  {
+  public:
+    FaultDetector ()
+        : silence_period_ (-1)
+    {
+    }
+
+  public:
+    class Failed {};
+
+
+    void
+    insync ()
+    {
+      silence_period_ = 0;
+    }
+
+    void
+    outsync ()
+    {
+      if (++silence_period_ >= Protocol::FATAL_SILENCE_FRAME)
+      {
+        // cerr << "Silence period has been passed." << endl;
+        // cerr << "Decalring the node failed." << endl;
+        throw Failed ();
+      }
+    }
+
+  private:
+    short silence_period_;
+  };
+}
diff --git a/ace/TMCast/Group.cpp b/ace/TMCast/Group.cpp
new file mode 100644
index 00000000000..f6858d96644
--- /dev/null
+++ b/ace/TMCast/Group.cpp
@@ -0,0 +1,508 @@
+// file      : TMCast/Group.cpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#include "Group.hpp"
+
+#include <typeinfo>
+
+// OS primitives
+#include <ace/OS.h>
+#include <ace/Synch.h>
+#include <ace/Time_Value.h>
+#include <ace/SOCK_Dgram_Mcast.h>
+
+#include "Messaging.hpp"
+
+#include "Protocol.hpp"
+
+// Components
+
+#include "LinkListener.hpp"
+#include "FaultDetector.hpp"
+#include "TransactionController.hpp"
+
+namespace TMCast
+{
+  bool
+  operator== (std::type_info const* pa, std::type_info const& b)
+  {
+    return *pa == b;
+  }
+
+  //
+  //
+  //
+  class Terminate : public virtual Message {};
+
+
+  //
+  //
+  //
+  class Failure : public virtual Message {};
+
+
+  //
+  //
+  //
+  class Scheduler
+  {
+  public:
+    Scheduler (ACE_INET_Addr const& addr,
+               char const* id,
+               MessageQueue& out_send_data,
+               MessageQueue& out_recv_data,
+               MessageQueue& out_control)
+
+        : cond_ (mutex_),
+
+          addr_ (addr),
+          sock_ (),
+
+          out_control_ (out_control),
+
+          in_data_ (mutex_),
+          in_link_data_(mutex_),
+          in_control_ (mutex_),
+
+          sync_schedule (ACE_OS::gettimeofday ()),
+
+          transaction_controller_ (in_data_, out_send_data, out_recv_data)
+    {
+      ACE_OS::strncpy (id_, id, Protocol::MEMBER_ID_LENGTH);
+      id_[Protocol::MEMBER_ID_LENGTH - 1] = '\0';
+
+      sock_.set_option (IP_MULTICAST_TTL, 32); // @@ ttl is hardcoded
+
+      in_data_.subscribe (cond_);
+      in_link_data_.subscribe (cond_);
+      in_control_.subscribe (cond_);
+
+      if (ACE_OS::thr_create (&thread_thunk,
+                              this,
+                              THR_JOINABLE,
+                              &thread_) != 0) ::abort ();
+    }
+
+    ~Scheduler ()
+    {
+      {
+        MessageQueueAutoLock lock (in_control_);
+
+        in_control_.push (MessagePtr (new Terminate));
+      }
+
+      if (ACE_OS::thr_join (thread_, 0) != 0) ::abort ();
+
+      // cerr << "Scheduler is down." << endl;
+    }
+
+  public:
+    MessageQueue&
+    in_data ()
+    {
+      return in_data_;
+    }
+
+  private:
+    static void*
+    thread_thunk (void* arg)
+    {
+      Scheduler* obj = reinterpret_cast<Scheduler*> (arg);
+
+      obj->execute ();
+      return 0;
+    }
+
+    void
+    execute ()
+    {
+      try
+      {
+        sock_.join (addr_);
+
+        auto_ptr<LinkListener> ll (new LinkListener (sock_, in_link_data_));
+
+        {
+          AutoLock lock (mutex_);
+
+          // Loop
+          //
+          //
+
+          while (true)
+          {
+            cond_.wait (&sync_schedule);
+
+            // "Loop of Fairness"
+
+            bool done = false;
+
+            do
+            {
+              // control message
+              //
+              //
+              if (!in_control_.empty ())
+              {
+                done = true;
+                break;
+              }
+
+
+              // outsync
+              //
+              //
+              if (sync_schedule < ACE_OS::gettimeofday ())
+              {
+                // OUTSYNC
+
+                outsync ();
+
+                // schedule next outsync
+
+                sync_schedule =
+                  ACE_OS::gettimeofday () +
+                  ACE_Time_Value (0, Protocol::SYNC_PERIOD);
+              }
+
+              // link message
+              //
+              //
+              if (!in_link_data_.empty ())
+              {
+                MessagePtr m (in_link_data_.front ());
+                in_link_data_.pop ();
+
+                std::type_info const* exp (&typeid (*m));
+
+                if (exp == typeid (LinkFailure))
+                {
+                  // cerr << "link failure" << endl;
+                  throw false;
+                }
+                else if (exp == typeid (LinkData))
+                {
+
+                  LinkData* data (dynamic_cast<LinkData*> (m.get ()));
+
+                  // INSYNC, TL, CT
+
+                  // Filter out loopback.
+                  //
+                  if (ACE_OS::strcmp (data->header().member_id.id, id_) != 0)
+                  {
+                    insync ();
+                    transaction_list ();
+                    current_transaction (data->header().current,
+                                         data->payload (),
+                                         data->size ());
+                  }
+                }
+                else
+                {
+                  // cerr << "unknown message type from link listener: "
+                  //      << typeid (*m).name () << endl;
+                  abort ();
+                }
+              }
+
+              // api message
+              //
+              //
+              if (!in_data_.empty ())
+              {
+                // API
+
+                api ();
+              }
+
+            } while (!in_link_data_.empty() ||
+                     sync_schedule < ACE_OS::gettimeofday ());
+
+            if (done) break;
+          }
+        }
+      }
+      catch (...)
+      {
+        // cerr << "Exception in scheduler loop." << endl;
+
+        MessageQueueAutoLock lock (out_control_);
+        out_control_.push (MessagePtr (new Failure));
+      }
+    }
+
+    // Events
+    //
+    // Order:
+    //
+    // INSYNC, TSL, VOTE, BEGIN
+    // API
+    // OUTSYNC
+    //
+
+    void
+    insync ()
+    {
+      fault_detector_.insync ();
+    }
+
+    void
+    outsync ()
+    {
+      char buf[Protocol::MAX_MESSAGE_SIZE];
+
+      Protocol::MessageHeader* hdr =
+        reinterpret_cast<Protocol::MessageHeader*> (buf);
+
+      void* data = buf + sizeof (Protocol::MessageHeader);
+
+      hdr->length = sizeof (Protocol::MessageHeader);
+      hdr->check_sum = 0;
+
+      ACE_OS::strcpy (hdr->member_id.id, id_);
+
+      size_t size (0);
+
+      transaction_controller_.outsync (hdr->current, data, size);
+
+      hdr->length += size;
+
+      fault_detector_.outsync ();
+
+      // sock_.send (buf, hdr->length, addr_);
+
+      sock_.send (buf, hdr->length);
+    }
+
+    void
+    transaction_list ()
+    {
+    }
+
+    void
+    current_transaction (Protocol::Transaction const& t,
+                         void const* payload,
+                         size_t size)
+    {
+      transaction_controller_.current_transaction (t, payload, size);
+    }
+
+    void
+    api ()
+    {
+      transaction_controller_.api ();
+    }
+
+  private:
+    ACE_thread_t thread_;
+
+    ACE_Thread_Mutex mutex_;
+    ACE_Condition<ACE_Thread_Mutex> cond_;
+
+    typedef ACE_Guard<ACE_Thread_Mutex> AutoLock;
+
+    char id_[Protocol::MEMBER_ID_LENGTH];
+
+    ACE_INET_Addr addr_;
+    ACE_SOCK_Dgram_Mcast sock_;
+
+    MessageQueue& out_control_;
+
+    MessageQueue  in_data_;
+    MessageQueue  in_link_data_;
+    MessageQueue  in_control_;
+
+    // Protocol state
+    //
+    //
+
+    ACE_Time_Value sync_schedule;
+
+    FaultDetector fault_detector_;
+    TransactionController transaction_controller_;
+  };
+
+
+  //
+  //
+  //
+  class Group::GroupImpl
+  {
+  public:
+    ~GroupImpl ()
+    {
+    }
+
+    GroupImpl (ACE_INET_Addr const& addr, char const* id)
+      throw (Group::Failed)
+        : send_cond_ (mutex_),
+          recv_cond_ (mutex_),
+          failed_ (false),
+          in_send_data_ (mutex_),
+          in_recv_data_ (mutex_),
+          in_control_ (mutex_),
+          scheduler_ (new  Scheduler (addr,
+                                      id,
+                                      in_send_data_,
+                                      in_recv_data_,
+                                      in_control_)),
+          out_data_ (scheduler_->in_data ())
+    {
+      in_send_data_.subscribe (send_cond_);
+      in_recv_data_.subscribe (recv_cond_);
+
+      in_control_.subscribe (send_cond_);
+      in_control_.subscribe (recv_cond_);
+    }
+
+    void
+    send (void const* msg, size_t size)
+      throw (Group::InvalidArg, Group::Failed, Group::Aborted)
+    {
+      if (size > Protocol::MAX_PAYLOAD_SIZE) throw InvalidArg ();
+
+      // Note the potential deadlock if I lock mutex_ and out_data_ in
+      // reverse order.
+
+      MessageQueueAutoLock l1 (out_data_);
+      AutoLock l2 (mutex_);
+
+      throw_if_failed ();
+
+      out_data_.push (MessagePtr (new Send (msg, size)));
+
+      l1.unlock (); // no need to keep it locked
+
+      while (true)
+      {
+        throw_if_failed ();
+
+        if (!in_send_data_.empty ())
+        {
+          MessagePtr m (in_send_data_.front ());
+          in_send_data_.pop ();
+
+          std::type_info const* exp (&typeid (*m));
+
+          if (exp == typeid (TMCast::Aborted))
+          {
+            throw Group::Aborted ();
+          }
+          else if (exp == typeid (Commited))
+          {
+            return;
+          }
+          else
+          {
+            // cerr << "send: group-scheduler messaging protocol violation; "
+            //     << "unexpected message " << typeid (*m).name ()
+            //     << " " << typeid (Aborted).name () << endl;
+
+            abort ();
+          }
+        }
+
+        // cerr << "send: waiting on condition" << endl;
+        send_cond_.wait ();
+        // cerr << "send: wokeup on condition" << endl;
+      }
+    }
+
+
+
+    size_t
+    recv (void* msg, size_t size) throw (Group::Failed, Group::InsufficienSpace)
+    {
+      AutoLock lock (mutex_);
+
+      while (true)
+      {
+        throw_if_failed ();
+
+        if (!in_recv_data_.empty ())
+        {
+          MessagePtr m (in_recv_data_.front ());
+          in_recv_data_.pop ();
+
+          std::type_info const* exp (&typeid (*m));
+
+          if (exp == typeid (Recv))
+          {
+            Recv* data (dynamic_cast<Recv*> (m.get ()));
+
+            if (size < data->size ()) throw Group::InsufficienSpace ();
+
+            memcpy (msg, data->payload (), data->size ());
+
+            return data->size ();
+          }
+          else
+          {
+            // cerr << "recv: group-scheduler messaging protocol violation. "
+            //     << "unexpected message " << typeid (*m).name () << endl;
+
+            abort ();
+          }
+        }
+
+        recv_cond_.wait ();
+      }
+    }
+
+  private:
+    void
+    throw_if_failed ()
+    {
+      if (!failed_ && !in_control_.empty ()) failed_ = true;
+
+      if (failed_) throw Group::Failed ();
+    }
+
+  private:
+    ACE_Thread_Mutex mutex_;
+    ACE_Condition<ACE_Thread_Mutex> send_cond_;
+    ACE_Condition<ACE_Thread_Mutex> recv_cond_;
+
+    typedef ACE_Guard<ACE_Thread_Mutex> AutoLock;
+
+    bool failed_;
+
+    MessageQueue  in_send_data_;
+    MessageQueue  in_recv_data_;
+    MessageQueue  in_control_;
+
+    auto_ptr<Scheduler> scheduler_;
+
+    MessageQueue& out_data_;
+  };
+
+
+  // Group
+  //
+  //
+  Group::
+  Group (ACE_INET_Addr const& addr, char const* id)
+    throw (Failed)
+      : pimpl_ (new GroupImpl (addr, id))
+  {
+  }
+
+  Group::
+  ~Group ()
+  {
+  }
+
+  void Group::
+  send (void const* msg, size_t size) throw (InvalidArg, Failed, Aborted)
+  {
+    pimpl_->send (msg, size);
+  }
+
+  size_t Group::
+  recv (void* msg, size_t size) throw (Failed, InsufficienSpace)
+  {
+    return pimpl_->recv (msg, size);
+  }
+}
diff --git a/ace/TMCast/Group.hpp b/ace/TMCast/Group.hpp
new file mode 100644
index 00000000000..416cea0a17d
--- /dev/null
+++ b/ace/TMCast/Group.hpp
@@ -0,0 +1,51 @@
+// file      : TMCast/Group.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_GROUP_HPP
+#define TMCAST_GROUP_HPP
+
+#include <ace/Auto_Ptr.h>
+#include <ace/INET_Addr.h>
+
+#include "Export.hpp"
+
+namespace TMCast
+{
+  class TMCast_Export Group
+  {
+  public:
+    class Aborted {};
+    class Failed {};
+    class InvalidArg {};
+    class InsufficienSpace {};
+
+  public:
+    ~Group ();
+
+    Group (ACE_INET_Addr const& addr, char const* id) throw (Failed);
+
+  public:
+    void
+    send (void const* msg, size_t size) throw (InvalidArg, Failed, Aborted);
+
+    size_t
+    recv (void* msg, size_t size) throw (Failed, InsufficienSpace);
+
+  private:
+    bool
+    failed ();
+
+  private:
+    class GroupImpl;
+    auto_ptr<GroupImpl> pimpl_;
+
+  private:
+    Group (Group const&);
+
+    Group&
+    operator= (Group const&);
+  };
+}
+
+#endif // TMCAST_GROUP_HPP
diff --git a/ace/TMCast/GroupFwd.hpp b/ace/TMCast/GroupFwd.hpp
new file mode 100644
index 00000000000..beba06df79d
--- /dev/null
+++ b/ace/TMCast/GroupFwd.hpp
@@ -0,0 +1,15 @@
+// file      : TMCast/GroupFwd.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_GROUP_FWD_HPP
+#define TMCAST_GROUP_FWD_HPP
+
+#include "Export.hpp"
+
+namespace TMCast
+{
+  class TMCast_Export Group;
+}
+
+#endif // TMCAST_GROUP_FWD_HPP
diff --git a/ace/TMCast/LinkListener.hpp b/ace/TMCast/LinkListener.hpp
new file mode 100644
index 00000000000..990f9e8f803
--- /dev/null
+++ b/ace/TMCast/LinkListener.hpp
@@ -0,0 +1,166 @@
+// file      : TMCast/LinkListener.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+// OS primitives
+#include <ace/Synch.h>
+#include <ace/SOCK_Dgram_Mcast.h>
+#include <ace/Refcounted_Auto_Ptr.h>
+
+
+#include "Messaging.hpp"
+
+namespace TMCast
+{
+  //
+  //
+  //
+  class LinkFailure : public virtual Message {};
+
+
+  //
+  //
+  //
+  class LinkData : public virtual Message
+  {
+  public:
+    LinkData (Protocol::MessageHeader const* header,
+              void* payload,
+              size_t size)
+        : size_ (size)
+    {
+      ACE_OS::memcpy (&header_, header, sizeof (Protocol::MessageHeader));
+      ACE_OS::memcpy (payload_, payload, size_);
+    }
+
+    Protocol::MessageHeader const&
+    header () const
+    {
+      return header_;
+    }
+
+    void const*
+    payload () const
+    {
+      return payload_;
+    }
+
+    size_t
+    size () const
+    {
+      return size_;
+    }
+
+  private:
+    Protocol::MessageHeader header_;
+    char payload_[Protocol::MAX_MESSAGE_SIZE];
+    size_t size_;
+  };
+
+  typedef
+  ACE_Refcounted_Auto_Ptr<LinkData, ACE_Null_Mutex>
+  LinkDataPtr;
+
+  //
+  //
+  //
+  class LinkListener
+  {
+  private:
+    class Terminate : public virtual Message {};
+
+  public:
+    LinkListener (ACE_SOCK_Dgram_Mcast& sock, MessageQueue& out)
+        : sock_(sock), out_ (out)
+    {
+      if (ACE_OS::thr_create (&thread_thunk,
+                              this,
+                              THR_JOINABLE,
+                              &thread_) != 0) ::abort ();
+    }
+
+    ~LinkListener ()
+    {
+      {
+        MessageQueueAutoLock lock (control_);
+
+        control_.push (MessagePtr (new Terminate));
+      }
+
+      if (ACE_OS::thr_join (thread_, 0) != 0) ::abort ();
+
+      // cerr << "Link listener is down." << endl;
+    }
+
+
+    static void*
+    thread_thunk (void* arg)
+    {
+      LinkListener* obj = reinterpret_cast<LinkListener*> (arg);
+
+      obj->execute ();
+      return 0;
+    }
+
+    void
+    execute ()
+    {
+      char msg[Protocol::MAX_MESSAGE_SIZE];
+
+      ssize_t header_size = sizeof (Protocol::MessageHeader);
+
+      // OS::Time timeout (1000000); // one millisecond
+
+      ACE_Time_Value timeout (0, 1000); // one millisecond
+
+      try
+      {
+        while (true)
+        {
+          // Check control message queue
+
+          {
+            MessageQueueAutoLock lock (control_);
+
+            if (!control_.empty ()) break;
+          }
+
+          ACE_Addr junk;
+          ssize_t n = sock_.recv (msg,
+                                  Protocol::MAX_MESSAGE_SIZE,
+                                  junk,
+                                  0,
+                                  &timeout);
+
+          if (n != -1)
+          {
+            if (n < header_size) throw false;
+
+            Protocol::MessageHeader* header =
+              reinterpret_cast<Protocol::MessageHeader*> (msg);
+
+            MessageQueueAutoLock lock (out_);
+
+            out_.push (MessagePtr (new LinkData (header,
+                                                 msg + header_size,
+                                                 n - header_size)));
+          }
+        }
+      }
+      catch (...)
+      {
+        MessageQueueAutoLock lock (out_);
+
+        out_.push (MessagePtr (new LinkFailure));
+      }
+    }
+
+  private:
+    typedef ACE_Guard<ACE_Thread_Mutex> AutoLock;
+
+    ACE_thread_t thread_;
+    ACE_SOCK_Dgram_Mcast& sock_;
+    MessageQueue& out_;
+    MessageQueue  control_;
+  };
+}
diff --git a/ace/TMCast/MTQueue.hpp b/ace/TMCast/MTQueue.hpp
new file mode 100644
index 00000000000..d593c034723
--- /dev/null
+++ b/ace/TMCast/MTQueue.hpp
@@ -0,0 +1,177 @@
+// file      : TMCast/MTQueue.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_MT_QUEUE_HPP
+#define TMCAST_MT_QUEUE_HPP
+
+#include "ace/Auto_Ptr.h"
+#include "ace/Unbounded_Set.h"
+#include "ace/Unbounded_Queue.h"
+
+namespace TMCast
+{
+  template <typename T,
+            typename M,
+            typename C,
+            typename Q = ACE_Unbounded_Queue<T> >
+  class MTQueue
+  {
+  public:
+    typedef T ElementType;
+    typedef M MutexType;
+    typedef C ConditionalType;
+    typedef Q QueueType;
+
+  public:
+
+    MTQueue (std::size_t hint = 0)
+        : mutexp_ (new MutexType),
+          mutex_ (*mutexp_),
+          // queue_ (hint),
+          queue_ (),
+          signal_ (false)
+    {
+    }
+
+    MTQueue (MutexType& mutex, std::size_t hint = 0)
+        : mutexp_ (),
+          mutex_ (mutex),
+          // queue_ (hint),
+          queue_ (),
+          signal_ (false)
+    {
+    }
+
+  public:
+    bool
+    empty () const
+    {
+      return queue_.is_empty ();
+    }
+
+    std::size_t
+    size () const
+    {
+      return queue_.size ();
+    }
+
+    // typedef typename QueueType::Empty Empty;
+
+    class Empty {};
+
+    T&
+    front ()
+    {
+      ACE_Unbounded_Queue_Iterator<T> f (queue_);
+      T* tmp;
+      if (!f.next (tmp)) throw Empty ();
+
+      return *tmp;
+    }
+
+
+    T const&
+    front () const
+    {
+      ACE_Unbounded_Queue_Const_Iterator<T> f (queue_);
+      T* tmp;
+      if (!f.next (tmp)) throw Empty ();
+
+      return *tmp;
+    }
+
+    /*
+      T&
+      back ()
+      {
+      return queue_.back ();
+      }
+
+
+      T const&
+      back () const
+      {
+      return queue_.back ();
+      }
+    */
+
+    void
+    push (T const& t)
+    {
+      signal_ = empty ();
+      queue_.enqueue_tail (t);
+    }
+
+    void
+    pop ()
+    {
+      T junk;
+      queue_.dequeue_head (junk);
+    }
+
+  public:
+    void
+    lock () const
+    {
+      mutex_.acquire ();
+    }
+
+    void
+    unlock () const
+    {
+      if (signal_)
+      {
+        signal_ = false;
+
+        for (ConditionalSetConstIterator_ i (cond_set_);
+             !i.done ();
+             i.advance ())
+        {
+          ConditionalType** c;
+
+          i.next (c);
+
+          (*c)->signal ();
+        }
+      }
+
+      mutex_.release ();
+    }
+
+    void
+    subscribe (ConditionalType& c)
+    {
+      //@@ should check for duplicates
+      //
+      cond_set_.insert (&c);
+    }
+
+    void
+    unsubscribe (ConditionalType& c)
+    {
+      //@@ should check for absence
+      //
+      cond_set_.remove (&c);
+    }
+
+  private:
+    auto_ptr<MutexType> mutexp_;
+    mutable MutexType& mutex_;
+    QueueType queue_;
+
+    typedef
+    ACE_Unbounded_Set<ConditionalType*>
+    ConditionalSet_;
+
+    typedef
+    ACE_Unbounded_Set_Const_Iterator<ConditionalType*>
+    ConditionalSetConstIterator_;
+
+    ConditionalSet_ cond_set_;
+
+    mutable bool signal_;
+  };
+}
+
+#endif // TMCAST_MT_QUEUE_HPP
diff --git a/ace/TMCast/Makefile b/ace/TMCast/Makefile
new file mode 100644
index 00000000000..87f6d1964ba
--- /dev/null
+++ b/ace/TMCast/Makefile
@@ -0,0 +1,221 @@
+#----------------------------------------------------------------------------
+#
+# $Id$
+#
+#----------------------------------------------------------------------------
+
+MAKEFILE = Makefile
+LIB      = libTMCast.a
+SHLIB    = libTMCast.$(SOEXT)
+
+FILES= Group Protocol
+
+LIBS=$(ACELIB)
+
+#----------------------------------------------------------------------------
+#       Include macros and targets
+#----------------------------------------------------------------------------
+
+include $(ACE_ROOT)/include/makeinclude/wrapper_macros.GNU
+
+LSRC  = $(addsuffix .cpp,$(FILES))
+
+include $(ACE_ROOT)/include/makeinclude/macros.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.common.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.nonested.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.lib.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.local.GNU
+
+#----------------------------------------------------------------------------
+#       Local targets
+#----------------------------------------------------------------------------
+
+ifeq ($(shared_libs),1)
+ifneq ($(SHLIB),)
+CPPFLAGS     += -DTMCAST_BUILD_DLL
+endif
+endif
+
+#----------------------------------------------------------------------------
+#       Dependencies
+#----------------------------------------------------------------------------
+# DO NOT DELETE THIS LINE -- g++dep uses it.
+# DO NOT PUT ANYTHING AFTER THIS LINE, IT WILL GO AWAY.
+
+
+.obj/Group.o .obj/Group.so .shobj/Group.o .shobj/Group.so: Group.cpp Group.hpp \
+  $(ACE_ROOT)/ace/Auto_Ptr.h \
+  $(ACE_ROOT)/ace/pre.h \
+  $(ACE_ROOT)/ace/post.h \
+  $(ACE_ROOT)/ace/ace_wchar.h \
+  $(ACE_ROOT)/ace/ace_wchar.inl \
+  $(ACE_ROOT)/ace/Auto_Ptr.i \
+  $(ACE_ROOT)/ace/Global_Macros.h \
+  $(ACE_ROOT)/ace/OS_Export.h \
+  $(ACE_ROOT)/ace/Auto_Ptr.cpp \
+  $(ACE_ROOT)/ace/INET_Addr.h \
+  $(ACE_ROOT)/ace/Sock_Connect.h \
+  $(ACE_ROOT)/ace/ACE_export.h \
+  $(ACE_ROOT)/ace/Basic_Types.h \
+  $(ACE_ROOT)/ace/os_include/os_limits.h \
+  $(ACE_ROOT)/ace/os_include/os_unistd.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_types.h \
+  $(ACE_ROOT)/ace/os_include/os_stddef.h \
+  $(ACE_ROOT)/ace/os_include/os_inttypes.h \
+  $(ACE_ROOT)/ace/os_include/os_stdint.h \
+  $(ACE_ROOT)/ace/os_include/os_stdio.h \
+  $(ACE_ROOT)/ace/os_include/os_stdarg.h \
+  $(ACE_ROOT)/ace/os_include/os_float.h \
+  $(ACE_ROOT)/ace/os_include/os_stdlib.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_wait.h \
+  $(ACE_ROOT)/ace/os_include/os_signal.h \
+  $(ACE_ROOT)/ace/os_include/os_time.h \
+  $(ACE_ROOT)/ace/os_include/os_ucontext.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_resource.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_time.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_select.h \
+  $(ACE_ROOT)/ace/Basic_Types.i \
+  $(ACE_ROOT)/ace/os_include/netinet/os_in.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_socket.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_uio.h \
+  $(ACE_ROOT)/ace/Sock_Connect.i \
+  $(ACE_ROOT)/ace/Addr.h \
+  $(ACE_ROOT)/ace/Addr.i \
+  $(ACE_ROOT)/ace/INET_Addr.i \
+  $(ACE_ROOT)/ace/OS.h \
+  $(ACE_ROOT)/ace/OS_Dirent.h \
+  $(ACE_ROOT)/ace/OS_Errno.h \
+  $(ACE_ROOT)/ace/os_include/os_errno.h \
+  $(ACE_ROOT)/ace/OS_Errno.inl \
+  $(ACE_ROOT)/ace/os_include/os_dirent.h \
+  $(ACE_ROOT)/ace/OS_Dirent.inl \
+  $(ACE_ROOT)/ace/OS_String.h \
+  $(ACE_ROOT)/ace/OS_String.inl \
+  $(ACE_ROOT)/ace/os_include/os_string.h \
+  $(ACE_ROOT)/ace/os_include/os_strings.h \
+  $(ACE_ROOT)/ace/os_include/os_ctype.h \
+  $(ACE_ROOT)/ace/OS_Memory.h \
+  $(ACE_ROOT)/ace/OS_Memory.inl \
+  $(ACE_ROOT)/ace/OS_TLI.h \
+  $(ACE_ROOT)/ace/OS_TLI.inl \
+  $(ACE_ROOT)/ace/os_include/os_dlfcn.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_mman.h \
+  $(ACE_ROOT)/ace/os_include/os_netdb.h \
+  $(ACE_ROOT)/ace/os_include/net/os_if.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_sem.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_ipc.h \
+  $(ACE_ROOT)/ace/Time_Value.h \
+  $(ACE_ROOT)/ace/Time_Value.inl \
+  $(ACE_ROOT)/ace/Default_Constants.h \
+  $(ACE_ROOT)/ace/Min_Max.h \
+  $(ACE_ROOT)/ace/os_include/os_pthread.h \
+  $(ACE_ROOT)/ace/os_include/os_assert.h \
+  $(ACE_ROOT)/ace/os_include/os_fcntl.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_stat.h \
+  $(ACE_ROOT)/ace/iosfwd.h \
+  $(ACE_ROOT)/ace/os_include/arpa/os_inet.h \
+  $(ACE_ROOT)/ace/os_include/netinet/os_tcp.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_shm.h \
+  $(ACE_ROOT)/ace/os_include/os_pwd.h \
+  $(ACE_ROOT)/ace/os_include/os_stropts.h \
+  $(ACE_ROOT)/ace/os_include/os_termios.h \
+  $(ACE_ROOT)/ace/os_include/os_aio.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_un.h \
+  $(ACE_ROOT)/ace/os_include/os_poll.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_msg.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_utsname.h \
+  $(ACE_ROOT)/ace/os_include/os_syslog.h \
+  $(ACE_ROOT)/ace/OS.i Export.hpp \
+  $(ACE_ROOT)/ace/Synch.h \
+  $(ACE_ROOT)/ace/Auto_Event.h \
+  $(ACE_ROOT)/ace/Event.h \
+  $(ACE_ROOT)/ace/Event.inl \
+  $(ACE_ROOT)/ace/Auto_Event.inl \
+  $(ACE_ROOT)/ace/Barrier.h \
+  $(ACE_ROOT)/ace/Condition_Thread_Mutex.h \
+  $(ACE_ROOT)/ace/Thread_Mutex.h \
+  $(ACE_ROOT)/ace/Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Condition_Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Barrier.inl \
+  $(ACE_ROOT)/ace/Condition_Recursive_Thread_Mutex.h \
+  $(ACE_ROOT)/ace/Recursive_Thread_Mutex.h \
+  $(ACE_ROOT)/ace/Recursive_Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Condition_Recursive_Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Lock.h \
+  $(ACE_ROOT)/ace/Lock.inl \
+  $(ACE_ROOT)/ace/Manual_Event.h \
+  $(ACE_ROOT)/ace/Manual_Event.inl \
+  $(ACE_ROOT)/ace/Mutex.h \
+  $(ACE_ROOT)/ace/Mutex.inl \
+  $(ACE_ROOT)/ace/Null_Barrier.h \
+  $(ACE_ROOT)/ace/Null_Condition.h \
+  $(ACE_ROOT)/ace/Null_Mutex.h \
+  $(ACE_ROOT)/ace/Null_Semaphore.h \
+  $(ACE_ROOT)/ace/RW_Mutex.h \
+  $(ACE_ROOT)/ace/RW_Mutex.inl \
+  $(ACE_ROOT)/ace/RW_Thread_Mutex.h \
+  $(ACE_ROOT)/ace/RW_Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Semaphore.h \
+  $(ACE_ROOT)/ace/Semaphore.inl \
+  $(ACE_ROOT)/ace/Thread_Semaphore.h \
+  $(ACE_ROOT)/ace/Thread_Semaphore.inl \
+  $(ACE_ROOT)/ace/TSS_Adapter.h \
+  $(ACE_ROOT)/ace/TSS_Adapter.inl \
+  $(ACE_ROOT)/ace/Synch.i \
+  $(ACE_ROOT)/ace/Synch_T.h \
+  $(ACE_ROOT)/ace/Lock_Adapter_T.h \
+  $(ACE_ROOT)/ace/Lock_Adapter_T.inl \
+  $(ACE_ROOT)/ace/Lock_Adapter_T.cpp \
+  $(ACE_ROOT)/ace/Reverse_Lock_T.h \
+  $(ACE_ROOT)/ace/Reverse_Lock_T.inl \
+  $(ACE_ROOT)/ace/Reverse_Lock_T.cpp \
+  $(ACE_ROOT)/ace/Guard_T.h \
+  $(ACE_ROOT)/ace/Guard_T.inl \
+  $(ACE_ROOT)/ace/Guard_T.cpp \
+  $(ACE_ROOT)/ace/TSS_T.h \
+  $(ACE_ROOT)/ace/TSS_T.inl \
+  $(ACE_ROOT)/ace/TSS_T.cpp \
+  $(ACE_ROOT)/ace/Thread.h \
+  $(ACE_ROOT)/ace/Thread_Adapter.h \
+  $(ACE_ROOT)/ace/Base_Thread_Adapter.h \
+  $(ACE_ROOT)/ace/OS_Log_Msg_Attributes.h \
+  $(ACE_ROOT)/ace/OS_Log_Msg_Attributes.inl \
+  $(ACE_ROOT)/ace/Base_Thread_Adapter.inl \
+  $(ACE_ROOT)/ace/Thread_Adapter.inl \
+  $(ACE_ROOT)/ace/Thread.i \
+  $(ACE_ROOT)/ace/Log_Msg.h \
+  $(ACE_ROOT)/ace/Log_Priority.h \
+  $(ACE_ROOT)/ace/Condition_T.h \
+  $(ACE_ROOT)/ace/Condition_T.inl \
+  $(ACE_ROOT)/ace/Condition_T.cpp \
+  $(ACE_ROOT)/ace/Synch_Traits.h \
+  $(ACE_ROOT)/ace/Synch_T.i \
+  $(ACE_ROOT)/ace/Synch_T.cpp \
+  $(ACE_ROOT)/ace/SOCK_Dgram_Mcast.h \
+  $(ACE_ROOT)/ace/SOCK_Dgram.h \
+  $(ACE_ROOT)/ace/SOCK.h \
+  $(ACE_ROOT)/ace/IPC_SAP.h \
+  $(ACE_ROOT)/ace/Flag_Manip.h \
+  $(ACE_ROOT)/ace/Flag_Manip.i \
+  $(ACE_ROOT)/ace/IPC_SAP.i \
+  $(ACE_ROOT)/ace/SOCK.i \
+  $(ACE_ROOT)/ace/SOCK_Dgram.i \
+  $(ACE_ROOT)/ace/SOCK_Dgram_Mcast.i \
+  Messaging.hpp \
+  $(ACE_ROOT)/ace/Refcounted_Auto_Ptr.h \
+  $(ACE_ROOT)/ace/Refcounted_Auto_Ptr.i \
+  MTQueue.hpp $(ACE_ROOT)/ace/Unbounded_Set.h \
+  $(ACE_ROOT)/ace/Node.h \
+  $(ACE_ROOT)/ace/Node.cpp \
+  $(ACE_ROOT)/ace/Unbounded_Set.inl \
+  $(ACE_ROOT)/ace/Unbounded_Set.cpp \
+  $(ACE_ROOT)/ace/Malloc_Base.h \
+  $(ACE_ROOT)/ace/Unbounded_Queue.h \
+  $(ACE_ROOT)/ace/Unbounded_Queue.inl \
+  $(ACE_ROOT)/ace/Unbounded_Queue.cpp \
+  Protocol.hpp LinkListener.hpp FaultDetector.hpp \
+  TransactionController.hpp
+
+.obj/Protocol.o .obj/Protocol.so .shobj/Protocol.o .shobj/Protocol.so: Protocol.cpp Protocol.hpp
+
+# IF YOU PUT ANYTHING HERE IT WILL GO AWAY
diff --git a/ace/TMCast/Messaging.hpp b/ace/TMCast/Messaging.hpp
new file mode 100644
index 00000000000..6a1000c3265
--- /dev/null
+++ b/ace/TMCast/Messaging.hpp
@@ -0,0 +1,54 @@
+// file      : TMCast/Messaging.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_MESSAGING_HPP
+#define TMCAST_MESSAGING_HPP
+
+#include <ace/Synch.h>
+#include <ace/Refcounted_Auto_Ptr.h>
+
+#include "MTQueue.hpp"
+
+namespace TMCast
+{
+  class Message
+  {
+  public:
+    virtual
+    ~Message () {}
+  };
+
+  typedef
+  ACE_Refcounted_Auto_Ptr<Message, ACE_Null_Mutex>
+  MessagePtr;
+
+  typedef
+  MTQueue<MessagePtr, ACE_Thread_Mutex, ACE_Condition<ACE_Thread_Mutex> >
+  MessageQueue;
+
+  struct MessageQueueAutoLock
+  {
+    MessageQueueAutoLock (MessageQueue& q)
+        : q_ (q)
+    {
+      q_.lock ();
+    }
+
+    void
+    unlock ()
+    {
+      q_.unlock ();
+    }
+
+    ~MessageQueueAutoLock ()
+    {
+    q_.unlock ();
+    }
+
+  private:
+    MessageQueue& q_;
+  };
+}
+
+#endif // TMCAST_MESSAGING_HPP
diff --git a/ace/TMCast/Protocol.cpp b/ace/TMCast/Protocol.cpp
new file mode 100644
index 00000000000..78563281694
--- /dev/null
+++ b/ace/TMCast/Protocol.cpp
@@ -0,0 +1,31 @@
+// file      : TMCast/Protocol.cpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#include "Protocol.hpp"
+
+namespace TMCast
+{
+  namespace Protocol
+  {
+    namespace
+    {
+      char const* labels[] = {
+        "NONE", "BEGIN", "COMMIT", "ABORT", "COMMITED", "ABORTED"};
+    }
+
+    /*
+      std::string
+      tslabel (Protocol::TransactionStatus s)
+      {
+      return labels[s];
+      }
+
+      std::ostream&
+      operator << (std::ostream& o, Transaction const& t)
+      {
+      return o << "{" << t.id << "; " << tslabel (t.status) << "}";
+      }
+    */
+  }
+}
diff --git a/ace/TMCast/Protocol.hpp b/ace/TMCast/Protocol.hpp
new file mode 100644
index 00000000000..d5ae6a50cd6
--- /dev/null
+++ b/ace/TMCast/Protocol.hpp
@@ -0,0 +1,107 @@
+// file      : TMCast/Protocol.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_PROTOCOL_HPP
+#define TMCAST_PROTOCOL_HPP
+
+namespace TMCast
+{
+  namespace Protocol
+  {
+    //
+    //
+    //
+    unsigned long const MEMBER_ID_LENGTH = 38;
+
+    struct MemberId
+    {
+      char id[MEMBER_ID_LENGTH];
+      /*
+        unsigned long  ip;
+        unsigned short port;
+      */
+    };
+
+    //
+    //
+    //
+    typedef unsigned short TransactionId;
+
+
+
+    typedef unsigned char  TransactionStatus;
+
+    TransactionStatus const TS_BEGIN    = 1;
+    TransactionStatus const TS_COMMIT   = 2;
+    TransactionStatus const TS_ABORT    = 3;
+    TransactionStatus const TS_COMMITED = 4;
+    TransactionStatus const TS_ABORTED  = 5;
+
+    struct Transaction
+    {
+      TransactionId id;
+      TransactionStatus status;
+    };
+
+    // Transaction List (TL)
+
+    // unsigned long const TL_LENGTH = 1;
+
+    // typedef Transaction TransactionList[TL_LENGTH];
+
+
+    //
+    //
+    //
+    struct MessageHeader
+    {
+      unsigned long length;
+
+      unsigned long check_sum;
+
+      MemberId member_id;
+
+      Transaction current;
+
+      //TransactionList transaction_list;
+    };
+
+
+    //
+    //
+    //
+
+    unsigned long const MAX_MESSAGE_SIZE = 768;
+
+    unsigned long const
+    MAX_PAYLOAD_SIZE = MAX_MESSAGE_SIZE - sizeof (MessageHeader);
+
+    // Protocol timing
+    //
+    //
+
+    unsigned long const SYNC_PERIOD = 30000;    // in mks
+
+    unsigned short const VOTING_FRAME = 4;      // in SYNC_PERIOD's
+    unsigned short const SEPARATION_FRAME = 5;  // in SYNC_PERIOD's
+
+    // FATAL_SILENCE_FRAME in SYNC_PERIOD's
+    // Generally it's a good idea to set it to < VOTING_FRAME + SEPARATION_FRAME
+    //
+
+    short const FATAL_SILENCE_FRAME = VOTING_FRAME + SEPARATION_FRAME - 2;
+
+    // short const FATAL_SILENCE_FRAME = 10000;
+
+    // Helpers
+
+    // std::string
+    // tslabel (Protocol::TransactionStatus s);
+
+    // std::ostream&
+    // operator << (std::ostream& o, Transaction const& t);
+  }
+}
+
+#endif // TMCAST_PROTOCOL_HPP
diff --git a/ace/TMCast/README b/ace/TMCast/README
new file mode 100644
index 00000000000..d061c7b2cba
--- /dev/null
+++ b/ace/TMCast/README
@@ -0,0 +1,58 @@
+
+
+Architecture
+
+TMCast (stands for Transaction MultiCast) is an implementation of a
+transactional multicast protocol. In essence, the idea is to represent
+message delivery to members of a multicast group as a transaction - 
+atomic, consistent and isolated action. Multicast transaction can
+be viewed as an atomic transition of group members to a new state. 
+If we define Mo as a set of operational (non-faulty) members of the 
+group, Mf as a set of faulty members of the group, Ma as a set of 
+members that view transition Tn as aborted and Mc as a set of members
+that view transition Tn as committed, then this atomic transition Tn
+can be described as one of the following:
+
+Mo(Tn-1) = Ma(T) U Mf(T)
+Mo(Tn-1) = Mc(T) U Mf(T)
+
+Or, in other words, after transaction T has been committed (aborted), 
+all operational (before transaction T) members are either in 
+committed (aborted) or failed state.
+
+Thus, for each member of the group, outcome of the transaction can
+be commit, abort or member failure. It is important for a member
+to exhibit a failfast (error latency is less than transaction cycle) 
+behavior. Or, in other words, if the member transitioned into a wrong 
+state, it is guaranteed to fail instead of delivering wrong result.
+
+In order to achieve such error detection in decentralized environment,
+certain limitations should be imposed. One of the most user-visible
+limitation is the fact that the lifetime of the group with only
+one member is very short. This is because there is not way for a 
+member to distinguish "no members yet" case from "my link to the
+group is down". In such situation, the member assumes the latter case. 
+There is also a military saying that puts it quite nicely: two is one, 
+one is nothing.
+
+
+State of Implementation
+
+Current implementation is in prototypical stage. The following parts 
+are not implemented or still under development:
+
+* Handling of network partitioning (TODO)
+
+* Redundant network support (TODO)
+
+* Member failure detection (partial implementation)
+
+
+Examples
+
+There is a simple example available in examples/TMCast/Member with 
+corresponding README.
+
+
+-- 
+Boris Kolpackov <boris@dre.vanderbilt.edu>
\ No newline at end of file
diff --git a/ace/TMCast/TransactionController.hpp b/ace/TMCast/TransactionController.hpp
new file mode 100644
index 00000000000..66c924faaf1
--- /dev/null
+++ b/ace/TMCast/TransactionController.hpp
@@ -0,0 +1,384 @@
+// file      : TMCast/TransactionController.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#include <ace/Synch.h>
+#include <ace/Refcounted_Auto_Ptr.h>
+
+#include "Protocol.hpp"
+#include "Messaging.hpp"
+
+namespace TMCast
+{
+
+  // Messages
+  //
+  //
+  class Send : public virtual Message
+  {
+  public:
+    Send (void const* msg, size_t size)
+        : size_ (size)
+    {
+      ACE_OS::memcpy (payload_, msg, size_);
+    }
+
+    void const*
+    payload () const
+    {
+      return payload_;
+    }
+
+    size_t
+    size () const
+    {
+      return size_;
+    }
+
+  private:
+    size_t size_;
+    char payload_[Protocol::MAX_PAYLOAD_SIZE];
+  };
+
+  typedef
+  ACE_Refcounted_Auto_Ptr<Send, ACE_Null_Mutex>
+  SendPtr;
+
+
+  class Recv : public virtual Message
+  {
+  public:
+    Recv (void const* msg, size_t size)
+        : size_ (size)
+    {
+      ACE_OS::memcpy (payload_, msg, size_);
+    }
+
+    void const*
+    payload () const
+    {
+      return payload_;
+    }
+
+    size_t
+    size () const
+    {
+      return size_;
+    }
+
+  private:
+    size_t size_;
+    char payload_[Protocol::MAX_PAYLOAD_SIZE];
+  };
+
+  typedef
+  ACE_Refcounted_Auto_Ptr<Recv, ACE_Null_Mutex>
+  RecvPtr;
+
+  class Aborted : public virtual Message {};
+
+  class Commited : public virtual Message {};
+
+
+  //
+  //
+  //
+  class TransactionController
+  {
+  public:
+    TransactionController (MessageQueue& in,
+                           MessageQueue& send_out,
+                           MessageQueue& recv_out)
+        : trace_ (false),
+          voting_duration_ (0),
+          separation_duration_ (0),
+          in_ (in),
+          send_out_ (send_out),
+          recv_out_ (recv_out)
+    {
+      current_.id = 0;
+      current_.status = Protocol::TS_COMMITED;
+    }
+
+  public:
+    class Failure {};
+
+
+    void
+    outsync (Protocol::Transaction& c, void* payload, size_t& size)
+    {
+      if (current_.status == Protocol::TS_COMMIT ||
+          current_.status == Protocol::TS_ABORT)
+      {
+        if (++voting_duration_ >= Protocol::VOTING_FRAME)
+        {
+          // end of voting frame
+
+          if (current_.status == Protocol::TS_COMMIT)
+          {
+            {
+              if (initiated_)
+              {
+                MessageQueueAutoLock lock (send_out_);
+                send_out_.push (MessagePtr (new Commited));
+              }
+              else // joined transaction
+              {
+                MessageQueueAutoLock lock (recv_out_);
+                recv_out_.push (MessagePtr (recv_.release ()));
+                recv_ = RecvPtr ();
+              }
+            }
+
+            current_.status = Protocol::TS_COMMITED;
+
+            // if (trace_) cerr << "commited transaction with id "
+            //                  << current_.id << endl;
+          }
+          else // TS_ABORT
+          {
+            if (initiated_)
+            {
+              MessageQueueAutoLock lock (send_out_);
+              send_out_.push (MessagePtr (new Aborted));
+            }
+            else
+            {
+              // free revc_ buffer if necessary
+              //
+              if (recv_.get ()) recv_ = RecvPtr ();
+            }
+
+
+            current_.status = Protocol::TS_ABORTED;
+
+            // if (trace_) cerr << "aborted transaction with id "
+            //                  << current_.id << endl;
+          }
+
+          // start transaction separation frame (counts down)
+          // +1 because it will be decremented on this iteration
+          separation_duration_ = Protocol::SEPARATION_FRAME + 1;
+        }
+      }
+
+      // Set current outsync info
+
+      c.id = current_.id;
+      c.status = current_.status;
+
+
+      // Do some post-processing
+
+      switch (current_.status)
+      {
+      case Protocol::TS_COMMITED:
+      case Protocol::TS_ABORTED:
+        {
+          if (separation_duration_ > 0) --separation_duration_;
+          break;
+        }
+      case Protocol::TS_BEGIN:
+        {
+          // transfer payload
+
+          size = send_->size ();
+          memcpy (payload, send_->payload (), size);
+
+          send_ = SendPtr ();
+
+          // get redy to vote for 'commit'
+
+          current_.status = Protocol::TS_COMMIT;
+          voting_duration_ = 0;
+        }
+      }
+    }
+
+    void
+    current_transaction (Protocol::Transaction const& t,
+                         void const* payload,
+                         size_t size)
+    {
+      Protocol::TransactionId& id = current_.id;
+      Protocol::TransactionStatus& s = current_.status;
+
+      if (id == 0 && t.id != 0) // catch up
+      {
+        switch (t.status)
+        {
+        case Protocol::TS_BEGIN:
+        case Protocol::TS_COMMIT:
+        case Protocol::TS_ABORT:
+          {
+            id = t.id - 1;
+            s = Protocol::TS_COMMITED;
+            break;
+          }
+        case Protocol::TS_ABORTED:
+        case Protocol::TS_COMMITED:
+          {
+            id = t.id;
+            s = t.status;
+            break;
+          }
+        }
+
+        // if (trace_) cerr << "caught up with id " << id << endl;
+      }
+
+      bool stable (s == Protocol::TS_COMMITED || s == Protocol::TS_ABORTED);
+
+      switch (t.status)
+      {
+      case Protocol::TS_BEGIN:
+        {
+          if (!stable || t.id != id + 1)
+          {
+            // Transaction is in progress or hole in transaction id's
+
+            // cerr << "unexpected request to join " << t
+            //     << " while on " << current_ << endl;
+
+            // if (!stable) cerr << "voting progress is " << voting_duration_
+            //                  << "/" << Protocol::VOTING_FRAME << endl;
+
+            if (t.id == id) // collision
+            {
+              if (!stable && s != Protocol::TS_ABORT)
+              {
+                // abort both
+                // cerr << "aborting both transactions" << endl;
+
+                s = Protocol::TS_ABORT;
+                voting_duration_ = 0; //@@ reset voting frame
+              }
+            }
+            else
+            {
+              // @@ delicate case. need to think more
+
+              // cerr << "Declaring node failed." << endl;
+              throw Failure ();
+            }
+          }
+          else
+          {
+            // join the transaction
+
+            initiated_ = false;
+
+            recv_ = RecvPtr (new Recv (payload, size));
+
+            id = t.id;
+            s = Protocol::TS_COMMIT;
+            voting_duration_ = 0;
+
+            // if (trace_) cerr << "joining-for-commit transaction with id "
+            //                  << id << endl;
+          }
+          break;
+        }
+      case Protocol::TS_COMMIT:
+        {
+          if (stable && id == t.id - 1)
+          {
+            // not begin and and we haven't joined
+
+            // join for abort
+
+            initiated_ = false;
+
+            current_.id = t.id;
+            current_.status = Protocol::TS_ABORT;
+            voting_duration_ = 0;
+
+            // if (trace_) cerr << "joining-for-abort transaction with id "
+            //                  << current_.id << endl;
+          }
+          break;
+        }
+      case Protocol::TS_ABORT:
+        {
+          if ((!stable && id == t.id && s == Protocol::TS_COMMIT) ||
+              (stable && id == t.id - 1)) // abort current || new transaction
+          {
+            // if (trace_) cerr << "voting-for-abort on transaction with id "
+            //                  << current_.id << endl;
+
+            id = t.id;
+            s = Protocol::TS_ABORT;
+
+            voting_duration_ = 0; //@@ reseting voting_duration_
+          }
+          else
+          {
+          }
+
+          break;
+        }
+      case Protocol::TS_ABORTED:
+      case Protocol::TS_COMMITED:
+        {
+          // nothing for now
+          break;
+        }
+      }
+    }
+
+    void
+    api ()
+    {
+      if ((current_.status == Protocol::TS_COMMITED ||
+           current_.status == Protocol::TS_ABORTED) &&
+          separation_duration_ == 0) // no transaction in progress
+      {
+        // start new transaction
+
+        // Note that in_ is already locked by Scheduler
+
+        MessagePtr m (in_.front ());
+        in_.pop ();
+
+        if (typeid (*m) == typeid (Send))
+        {
+          send_ = SendPtr (dynamic_cast<Send*> (m.release ()));
+        }
+        else
+        {
+          // cerr << "Expecting Send but received " << typeid (*m).name ()
+          //      << endl;
+
+          ::abort ();
+        }
+
+        current_.id++;
+        current_.status = Protocol::TS_BEGIN;
+
+        initiated_ = true;
+
+        // if (trace_) cerr << "starting transaction with id " << current_.id
+        //                  << endl;
+      }
+    }
+
+  private:
+    typedef ACE_Guard<ACE_Thread_Mutex> AutoLock;
+
+    bool trace_;
+
+    Protocol::Transaction current_;
+
+    bool initiated_;
+
+    unsigned short voting_duration_;
+    unsigned short separation_duration_;
+
+    MessageQueue& in_;
+    MessageQueue& send_out_;
+    MessageQueue& recv_out_;
+
+    SendPtr send_;
+    RecvPtr recv_;
+  };
+}
diff --git a/examples/TMCast/Makefile b/examples/TMCast/Makefile
new file mode 100644
index 00000000000..5a39f26db35
--- /dev/null
+++ b/examples/TMCast/Makefile
@@ -0,0 +1,21 @@
+#----------------------------------------------------------------------------
+#
+# $Id$
+#
+#----------------------------------------------------------------------------
+
+#----------------------------------------------------------------------------
+#	Local macros
+#----------------------------------------------------------------------------
+
+DIRS  =	Member
+
+#----------------------------------------------------------------------------
+#	Include macros and targets
+#----------------------------------------------------------------------------
+
+include	$(ACE_ROOT)/include/makeinclude/wrapper_macros.GNU
+include	$(ACE_ROOT)/include/makeinclude/macros.GNU
+include	$(ACE_ROOT)/include/makeinclude/rules.common.GNU
+include	$(ACE_ROOT)/include/makeinclude/rules.nested.GNU
+include	$(ACE_ROOT)/include/makeinclude/rules.nolocal.GNU
diff --git a/examples/TMCast/Member/Makefile b/examples/TMCast/Member/Makefile
new file mode 100644
index 00000000000..babfc7793b9
--- /dev/null
+++ b/examples/TMCast/Member/Makefile
@@ -0,0 +1,124 @@
+#----------------------------------------------------------------------------
+#
+# $Id$
+#
+#----------------------------------------------------------------------------
+
+#----------------------------------------------------------------------------
+#       Local macros
+#----------------------------------------------------------------------------
+
+BIN = member
+
+PSRC=$(addsuffix .cpp,$(BIN))
+LDLIBS = -lTMCast
+
+#----------------------------------------------------------------------------
+#       Include macros and targets
+#----------------------------------------------------------------------------
+
+include $(ACE_ROOT)/include/makeinclude/wrapper_macros.GNU
+include $(ACE_ROOT)/include/makeinclude/macros.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.common.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.nonested.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.bin.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.local.GNU
+
+#----------------------------------------------------------------------------
+#       Local targets
+#----------------------------------------------------------------------------
+
+#----------------------------------------------------------------------------
+#       Dependencies
+#----------------------------------------------------------------------------
+# DO NOT DELETE THIS LINE -- g++dep uses it.
+# DO NOT PUT ANYTHING AFTER THIS LINE, IT WILL GO AWAY.
+
+
+.obj/member.o .obj/member.so .shobj/member.o .shobj/member.so: member.cpp \
+  $(ACE_ROOT)/ace/TMCast/Group.hpp \
+  $(ACE_ROOT)/ace/Auto_Ptr.h \
+  $(ACE_ROOT)/ace/pre.h \
+  $(ACE_ROOT)/ace/post.h \
+  $(ACE_ROOT)/ace/ace_wchar.h \
+  $(ACE_ROOT)/ace/ace_wchar.inl \
+  $(ACE_ROOT)/ace/Auto_Ptr.i \
+  $(ACE_ROOT)/ace/Global_Macros.h \
+  $(ACE_ROOT)/ace/OS_Export.h \
+  $(ACE_ROOT)/ace/Auto_Ptr.cpp \
+  $(ACE_ROOT)/ace/INET_Addr.h \
+  $(ACE_ROOT)/ace/Sock_Connect.h \
+  $(ACE_ROOT)/ace/ACE_export.h \
+  $(ACE_ROOT)/ace/Basic_Types.h \
+  $(ACE_ROOT)/ace/os_include/os_limits.h \
+  $(ACE_ROOT)/ace/os_include/os_unistd.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_types.h \
+  $(ACE_ROOT)/ace/os_include/os_stddef.h \
+  $(ACE_ROOT)/ace/os_include/os_inttypes.h \
+  $(ACE_ROOT)/ace/os_include/os_stdint.h \
+  $(ACE_ROOT)/ace/os_include/os_stdio.h \
+  $(ACE_ROOT)/ace/os_include/os_stdarg.h \
+  $(ACE_ROOT)/ace/os_include/os_float.h \
+  $(ACE_ROOT)/ace/os_include/os_stdlib.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_wait.h \
+  $(ACE_ROOT)/ace/os_include/os_signal.h \
+  $(ACE_ROOT)/ace/os_include/os_time.h \
+  $(ACE_ROOT)/ace/os_include/os_ucontext.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_resource.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_time.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_select.h \
+  $(ACE_ROOT)/ace/Basic_Types.i \
+  $(ACE_ROOT)/ace/os_include/netinet/os_in.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_socket.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_uio.h \
+  $(ACE_ROOT)/ace/Sock_Connect.i \
+  $(ACE_ROOT)/ace/Addr.h \
+  $(ACE_ROOT)/ace/Addr.i \
+  $(ACE_ROOT)/ace/INET_Addr.i \
+  $(ACE_ROOT)/ace/OS.h \
+  $(ACE_ROOT)/ace/OS_Dirent.h \
+  $(ACE_ROOT)/ace/OS_Errno.h \
+  $(ACE_ROOT)/ace/os_include/os_errno.h \
+  $(ACE_ROOT)/ace/OS_Errno.inl \
+  $(ACE_ROOT)/ace/os_include/os_dirent.h \
+  $(ACE_ROOT)/ace/OS_Dirent.inl \
+  $(ACE_ROOT)/ace/OS_String.h \
+  $(ACE_ROOT)/ace/OS_String.inl \
+  $(ACE_ROOT)/ace/os_include/os_string.h \
+  $(ACE_ROOT)/ace/os_include/os_strings.h \
+  $(ACE_ROOT)/ace/os_include/os_ctype.h \
+  $(ACE_ROOT)/ace/OS_Memory.h \
+  $(ACE_ROOT)/ace/OS_Memory.inl \
+  $(ACE_ROOT)/ace/OS_TLI.h \
+  $(ACE_ROOT)/ace/OS_TLI.inl \
+  $(ACE_ROOT)/ace/os_include/os_dlfcn.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_mman.h \
+  $(ACE_ROOT)/ace/os_include/os_netdb.h \
+  $(ACE_ROOT)/ace/os_include/net/os_if.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_sem.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_ipc.h \
+  $(ACE_ROOT)/ace/Time_Value.h \
+  $(ACE_ROOT)/ace/Time_Value.inl \
+  $(ACE_ROOT)/ace/Default_Constants.h \
+  $(ACE_ROOT)/ace/Min_Max.h \
+  $(ACE_ROOT)/ace/os_include/os_pthread.h \
+  $(ACE_ROOT)/ace/os_include/os_assert.h \
+  $(ACE_ROOT)/ace/os_include/os_fcntl.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_stat.h \
+  $(ACE_ROOT)/ace/iosfwd.h \
+  $(ACE_ROOT)/ace/os_include/arpa/os_inet.h \
+  $(ACE_ROOT)/ace/os_include/netinet/os_tcp.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_shm.h \
+  $(ACE_ROOT)/ace/os_include/os_pwd.h \
+  $(ACE_ROOT)/ace/os_include/os_stropts.h \
+  $(ACE_ROOT)/ace/os_include/os_termios.h \
+  $(ACE_ROOT)/ace/os_include/os_aio.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_un.h \
+  $(ACE_ROOT)/ace/os_include/os_poll.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_msg.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_utsname.h \
+  $(ACE_ROOT)/ace/os_include/os_syslog.h \
+  $(ACE_ROOT)/ace/OS.i \
+  $(ACE_ROOT)/ace/TMCast/Export.hpp
+
+# IF YOU PUT ANYTHING HERE IT WILL GO AWAY
diff --git a/examples/TMCast/Member/README b/examples/TMCast/Member/README
new file mode 100644
index 00000000000..6a62a107a77
--- /dev/null
+++ b/examples/TMCast/Member/README
@@ -0,0 +1,36 @@
+Member example shows how you can build a simple multicast group 
+using transactional multicast (TMCast). Each member can be either 
+a sender or a receiver.
+
+The sender sends small messages to the multicast group with a random 
+wait period in [0, 1] second range. The receiver is simply receiving
+those messages and prints them out.
+
+To start the sender you can execute something like this:
+
+$ ./member s sender-1 239.255.0.1:10000
+
+Here the first argument ('s') indicates that new member will be
+a sender. The second argument ('sender-1') is an id of the new
+member (each member of the group should have a unique id). And 
+the third argument ('239.255.0.1:10000') specifies IPv4 multicast 
+address and port (you can choose you own).
+
+To start the receiver you can execute similar command:
+
+$ ./member r receiver-1 239.255.0.1:10000
+
+After you have started both the receiver and the sender you
+should see a sequence of messages printed by the receiver.
+
+Note, since the group can exist with only one member for a 
+very short period of time you should start first two members
+virtually at the same time. See TMCast documentation for more
+information about why it behaves this way.
+
+You may want to add more than one sender to the group if you
+want to see how TMCast operates in a totally-ordered mode.
+
+
+-- 
+Boris Kolpackov <boris@dre.vanderbilt.edu>
diff --git a/examples/TMCast/Member/member.cpp b/examples/TMCast/Member/member.cpp
new file mode 100644
index 00000000000..1c07c6c8532
--- /dev/null
+++ b/examples/TMCast/Member/member.cpp
@@ -0,0 +1,80 @@
+// file      : TMCast/Member/member.cpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#include <ace/Log_Msg.h>
+
+#include "ace/TMCast/Group.hpp"
+
+class Args {};
+
+int
+main (int argc, char* argv[])
+{
+  try
+  {
+    if (argc < 4) throw Args ();
+
+    bool receiver (true);
+
+    if (argv[1][0] == 'r') receiver = true;
+    else if (argv[1][0] == 's') receiver = false;
+    else throw Args ();
+
+    if (!receiver) ACE_OS::srand (ACE_OS::time ());
+
+    ACE_INET_Addr address (argv[3]);
+
+    TMCast::Group group (address, argv[2]);
+
+    if (receiver)
+    {
+      for (char buffer[256];;)
+      {
+        group.recv (buffer, sizeof (buffer));
+
+        ACE_DEBUG ((LM_DEBUG, "%s\n", buffer));
+      }
+    }
+    else
+    {
+      char buffer[256];
+
+      for (unsigned long i = 0; i < 1000; i++)
+      {
+        // Sleep some random time around 1 sec.
+
+        unsigned long t = (1000000ULL * ACE_OS::rand ()) / RAND_MAX;
+
+        // ACE_DEBUG ((LM_DEBUG, "sleeping for %u\n", t));
+
+        ACE_OS::sleep (ACE_Time_Value (0, t));
+
+        ACE_OS::sprintf (buffer, "message # %lu", i);
+
+        try
+        {
+          group.send (buffer, ACE_OS::strlen (buffer) + 1);
+        }
+        catch (TMCast::Group::Aborted const&)
+        {
+          ACE_ERROR ((LM_ERROR, "%s has been aborted\n", buffer));
+        }
+      }
+    }
+  }
+  catch (Args const&)
+  {
+    ACE_ERROR ((LM_ERROR,
+                "Usage: member {r|s} <id> <IPv4 mcast address>:<port>\n"));
+  }
+  catch (TMCast::Group::Failed const&)
+  {
+    ACE_ERROR ((LM_ERROR,
+                "Group failure. Perhaps I am alone in the group.\n"));
+  }
+  catch (TMCast::Group::InsufficienSpace const&)
+  {
+    ACE_ERROR ((LM_ERROR, "Insufficient space in receive buffer.\n"));
+  }
+}
diff --git a/protocols/ace/TMCast/Export.hpp b/protocols/ace/TMCast/Export.hpp
new file mode 100644
index 00000000000..149a83cb785
--- /dev/null
+++ b/protocols/ace/TMCast/Export.hpp
@@ -0,0 +1,54 @@
+
+// -*- C++ -*-
+// $Id$
+// Definition for Win32 Export directives.
+// This file is generated automatically by generate_export_file.pl TMCast
+// ------------------------------
+#ifndef TMCAST_EXPORT_H
+#define TMCAST_EXPORT_H
+
+#include "ace/config-all.h"
+
+#if !defined (TMCAST_HAS_DLL)
+#  define TMCAST_HAS_DLL 1
+#endif /* ! TMCAST_HAS_DLL */
+
+#if defined (TMCAST_HAS_DLL) && (TMCAST_HAS_DLL == 1)
+#  if defined (TMCAST_BUILD_DLL)
+#    define TMCast_Export ACE_Proper_Export_Flag
+#    define TMCAST_SINGLETON_DECLARATION(T) ACE_EXPORT_SINGLETON_DECLARATION (T)
+#    define TMCAST_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK) ACE_EXPORT_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK)
+#  else /* TMCAST_BUILD_DLL */
+#    define TMCast_Export ACE_Proper_Import_Flag
+#    define TMCAST_SINGLETON_DECLARATION(T) ACE_IMPORT_SINGLETON_DECLARATION (T)
+#    define TMCAST_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK) ACE_IMPORT_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK)
+#  endif /* TMCAST_BUILD_DLL */
+#else /* TMCAST_HAS_DLL == 1 */
+#  define TMCast_Export
+#  define TMCAST_SINGLETON_DECLARATION(T)
+#  define TMCAST_SINGLETON_DECLARE(SINGLETON_TYPE, CLASS, LOCK)
+#endif /* TMCAST_HAS_DLL == 1 */
+
+// Set TMCAST_NTRACE = 0 to turn on library specific tracing even if
+// tracing is turned off for ACE.
+#if !defined (TMCAST_NTRACE)
+#  if (ACE_NTRACE == 1)
+#    define TMCAST_NTRACE 1
+#  else /* (ACE_NTRACE == 1) */
+#    define TMCAST_NTRACE 0
+#  endif /* (ACE_NTRACE == 1) */
+#endif /* !TMCAST_NTRACE */
+
+#if (TMCAST_NTRACE == 1)
+#  define TMCAST_TRACE(X)
+#else /* (TMCAST_NTRACE == 1) */
+#  if !defined (ACE_HAS_TRACE)
+#    define ACE_HAS_TRACE
+#  endif /* ACE_HAS_TRACE */
+#  define TMCAST_TRACE(X) ACE_TRACE_IMPL(X)
+#  include "ace/Trace.h"
+#endif /* (TMCAST_NTRACE == 1) */
+
+#endif /* TMCAST_EXPORT_H */
+
+// End of auto generated file.
diff --git a/protocols/ace/TMCast/FaultDetector.hpp b/protocols/ace/TMCast/FaultDetector.hpp
new file mode 100644
index 00000000000..ba476cbd367
--- /dev/null
+++ b/protocols/ace/TMCast/FaultDetector.hpp
@@ -0,0 +1,41 @@
+// file      : TMCast/FaultDetector.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#include "Protocol.hpp"
+
+namespace TMCast
+{
+  class FaultDetector
+  {
+  public:
+    FaultDetector ()
+        : silence_period_ (-1)
+    {
+    }
+
+  public:
+    class Failed {};
+
+
+    void
+    insync ()
+    {
+      silence_period_ = 0;
+    }
+
+    void
+    outsync ()
+    {
+      if (++silence_period_ >= Protocol::FATAL_SILENCE_FRAME)
+      {
+        // cerr << "Silence period has been passed." << endl;
+        // cerr << "Decalring the node failed." << endl;
+        throw Failed ();
+      }
+    }
+
+  private:
+    short silence_period_;
+  };
+}
diff --git a/protocols/ace/TMCast/Group.cpp b/protocols/ace/TMCast/Group.cpp
new file mode 100644
index 00000000000..f6858d96644
--- /dev/null
+++ b/protocols/ace/TMCast/Group.cpp
@@ -0,0 +1,508 @@
+// file      : TMCast/Group.cpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#include "Group.hpp"
+
+#include <typeinfo>
+
+// OS primitives
+#include <ace/OS.h>
+#include <ace/Synch.h>
+#include <ace/Time_Value.h>
+#include <ace/SOCK_Dgram_Mcast.h>
+
+#include "Messaging.hpp"
+
+#include "Protocol.hpp"
+
+// Components
+
+#include "LinkListener.hpp"
+#include "FaultDetector.hpp"
+#include "TransactionController.hpp"
+
+namespace TMCast
+{
+  bool
+  operator== (std::type_info const* pa, std::type_info const& b)
+  {
+    return *pa == b;
+  }
+
+  //
+  //
+  //
+  class Terminate : public virtual Message {};
+
+
+  //
+  //
+  //
+  class Failure : public virtual Message {};
+
+
+  //
+  //
+  //
+  class Scheduler
+  {
+  public:
+    Scheduler (ACE_INET_Addr const& addr,
+               char const* id,
+               MessageQueue& out_send_data,
+               MessageQueue& out_recv_data,
+               MessageQueue& out_control)
+
+        : cond_ (mutex_),
+
+          addr_ (addr),
+          sock_ (),
+
+          out_control_ (out_control),
+
+          in_data_ (mutex_),
+          in_link_data_(mutex_),
+          in_control_ (mutex_),
+
+          sync_schedule (ACE_OS::gettimeofday ()),
+
+          transaction_controller_ (in_data_, out_send_data, out_recv_data)
+    {
+      ACE_OS::strncpy (id_, id, Protocol::MEMBER_ID_LENGTH);
+      id_[Protocol::MEMBER_ID_LENGTH - 1] = '\0';
+
+      sock_.set_option (IP_MULTICAST_TTL, 32); // @@ ttl is hardcoded
+
+      in_data_.subscribe (cond_);
+      in_link_data_.subscribe (cond_);
+      in_control_.subscribe (cond_);
+
+      if (ACE_OS::thr_create (&thread_thunk,
+                              this,
+                              THR_JOINABLE,
+                              &thread_) != 0) ::abort ();
+    }
+
+    ~Scheduler ()
+    {
+      {
+        MessageQueueAutoLock lock (in_control_);
+
+        in_control_.push (MessagePtr (new Terminate));
+      }
+
+      if (ACE_OS::thr_join (thread_, 0) != 0) ::abort ();
+
+      // cerr << "Scheduler is down." << endl;
+    }
+
+  public:
+    MessageQueue&
+    in_data ()
+    {
+      return in_data_;
+    }
+
+  private:
+    static void*
+    thread_thunk (void* arg)
+    {
+      Scheduler* obj = reinterpret_cast<Scheduler*> (arg);
+
+      obj->execute ();
+      return 0;
+    }
+
+    void
+    execute ()
+    {
+      try
+      {
+        sock_.join (addr_);
+
+        auto_ptr<LinkListener> ll (new LinkListener (sock_, in_link_data_));
+
+        {
+          AutoLock lock (mutex_);
+
+          // Loop
+          //
+          //
+
+          while (true)
+          {
+            cond_.wait (&sync_schedule);
+
+            // "Loop of Fairness"
+
+            bool done = false;
+
+            do
+            {
+              // control message
+              //
+              //
+              if (!in_control_.empty ())
+              {
+                done = true;
+                break;
+              }
+
+
+              // outsync
+              //
+              //
+              if (sync_schedule < ACE_OS::gettimeofday ())
+              {
+                // OUTSYNC
+
+                outsync ();
+
+                // schedule next outsync
+
+                sync_schedule =
+                  ACE_OS::gettimeofday () +
+                  ACE_Time_Value (0, Protocol::SYNC_PERIOD);
+              }
+
+              // link message
+              //
+              //
+              if (!in_link_data_.empty ())
+              {
+                MessagePtr m (in_link_data_.front ());
+                in_link_data_.pop ();
+
+                std::type_info const* exp (&typeid (*m));
+
+                if (exp == typeid (LinkFailure))
+                {
+                  // cerr << "link failure" << endl;
+                  throw false;
+                }
+                else if (exp == typeid (LinkData))
+                {
+
+                  LinkData* data (dynamic_cast<LinkData*> (m.get ()));
+
+                  // INSYNC, TL, CT
+
+                  // Filter out loopback.
+                  //
+                  if (ACE_OS::strcmp (data->header().member_id.id, id_) != 0)
+                  {
+                    insync ();
+                    transaction_list ();
+                    current_transaction (data->header().current,
+                                         data->payload (),
+                                         data->size ());
+                  }
+                }
+                else
+                {
+                  // cerr << "unknown message type from link listener: "
+                  //      << typeid (*m).name () << endl;
+                  abort ();
+                }
+              }
+
+              // api message
+              //
+              //
+              if (!in_data_.empty ())
+              {
+                // API
+
+                api ();
+              }
+
+            } while (!in_link_data_.empty() ||
+                     sync_schedule < ACE_OS::gettimeofday ());
+
+            if (done) break;
+          }
+        }
+      }
+      catch (...)
+      {
+        // cerr << "Exception in scheduler loop." << endl;
+
+        MessageQueueAutoLock lock (out_control_);
+        out_control_.push (MessagePtr (new Failure));
+      }
+    }
+
+    // Events
+    //
+    // Order:
+    //
+    // INSYNC, TSL, VOTE, BEGIN
+    // API
+    // OUTSYNC
+    //
+
+    void
+    insync ()
+    {
+      fault_detector_.insync ();
+    }
+
+    void
+    outsync ()
+    {
+      char buf[Protocol::MAX_MESSAGE_SIZE];
+
+      Protocol::MessageHeader* hdr =
+        reinterpret_cast<Protocol::MessageHeader*> (buf);
+
+      void* data = buf + sizeof (Protocol::MessageHeader);
+
+      hdr->length = sizeof (Protocol::MessageHeader);
+      hdr->check_sum = 0;
+
+      ACE_OS::strcpy (hdr->member_id.id, id_);
+
+      size_t size (0);
+
+      transaction_controller_.outsync (hdr->current, data, size);
+
+      hdr->length += size;
+
+      fault_detector_.outsync ();
+
+      // sock_.send (buf, hdr->length, addr_);
+
+      sock_.send (buf, hdr->length);
+    }
+
+    void
+    transaction_list ()
+    {
+    }
+
+    void
+    current_transaction (Protocol::Transaction const& t,
+                         void const* payload,
+                         size_t size)
+    {
+      transaction_controller_.current_transaction (t, payload, size);
+    }
+
+    void
+    api ()
+    {
+      transaction_controller_.api ();
+    }
+
+  private:
+    ACE_thread_t thread_;
+
+    ACE_Thread_Mutex mutex_;
+    ACE_Condition<ACE_Thread_Mutex> cond_;
+
+    typedef ACE_Guard<ACE_Thread_Mutex> AutoLock;
+
+    char id_[Protocol::MEMBER_ID_LENGTH];
+
+    ACE_INET_Addr addr_;
+    ACE_SOCK_Dgram_Mcast sock_;
+
+    MessageQueue& out_control_;
+
+    MessageQueue  in_data_;
+    MessageQueue  in_link_data_;
+    MessageQueue  in_control_;
+
+    // Protocol state
+    //
+    //
+
+    ACE_Time_Value sync_schedule;
+
+    FaultDetector fault_detector_;
+    TransactionController transaction_controller_;
+  };
+
+
+  //
+  //
+  //
+  class Group::GroupImpl
+  {
+  public:
+    ~GroupImpl ()
+    {
+    }
+
+    GroupImpl (ACE_INET_Addr const& addr, char const* id)
+      throw (Group::Failed)
+        : send_cond_ (mutex_),
+          recv_cond_ (mutex_),
+          failed_ (false),
+          in_send_data_ (mutex_),
+          in_recv_data_ (mutex_),
+          in_control_ (mutex_),
+          scheduler_ (new  Scheduler (addr,
+                                      id,
+                                      in_send_data_,
+                                      in_recv_data_,
+                                      in_control_)),
+          out_data_ (scheduler_->in_data ())
+    {
+      in_send_data_.subscribe (send_cond_);
+      in_recv_data_.subscribe (recv_cond_);
+
+      in_control_.subscribe (send_cond_);
+      in_control_.subscribe (recv_cond_);
+    }
+
+    void
+    send (void const* msg, size_t size)
+      throw (Group::InvalidArg, Group::Failed, Group::Aborted)
+    {
+      if (size > Protocol::MAX_PAYLOAD_SIZE) throw InvalidArg ();
+
+      // Note the potential deadlock if I lock mutex_ and out_data_ in
+      // reverse order.
+
+      MessageQueueAutoLock l1 (out_data_);
+      AutoLock l2 (mutex_);
+
+      throw_if_failed ();
+
+      out_data_.push (MessagePtr (new Send (msg, size)));
+
+      l1.unlock (); // no need to keep it locked
+
+      while (true)
+      {
+        throw_if_failed ();
+
+        if (!in_send_data_.empty ())
+        {
+          MessagePtr m (in_send_data_.front ());
+          in_send_data_.pop ();
+
+          std::type_info const* exp (&typeid (*m));
+
+          if (exp == typeid (TMCast::Aborted))
+          {
+            throw Group::Aborted ();
+          }
+          else if (exp == typeid (Commited))
+          {
+            return;
+          }
+          else
+          {
+            // cerr << "send: group-scheduler messaging protocol violation; "
+            //     << "unexpected message " << typeid (*m).name ()
+            //     << " " << typeid (Aborted).name () << endl;
+
+            abort ();
+          }
+        }
+
+        // cerr << "send: waiting on condition" << endl;
+        send_cond_.wait ();
+        // cerr << "send: wokeup on condition" << endl;
+      }
+    }
+
+
+
+    size_t
+    recv (void* msg, size_t size) throw (Group::Failed, Group::InsufficienSpace)
+    {
+      AutoLock lock (mutex_);
+
+      while (true)
+      {
+        throw_if_failed ();
+
+        if (!in_recv_data_.empty ())
+        {
+          MessagePtr m (in_recv_data_.front ());
+          in_recv_data_.pop ();
+
+          std::type_info const* exp (&typeid (*m));
+
+          if (exp == typeid (Recv))
+          {
+            Recv* data (dynamic_cast<Recv*> (m.get ()));
+
+            if (size < data->size ()) throw Group::InsufficienSpace ();
+
+            memcpy (msg, data->payload (), data->size ());
+
+            return data->size ();
+          }
+          else
+          {
+            // cerr << "recv: group-scheduler messaging protocol violation. "
+            //     << "unexpected message " << typeid (*m).name () << endl;
+
+            abort ();
+          }
+        }
+
+        recv_cond_.wait ();
+      }
+    }
+
+  private:
+    void
+    throw_if_failed ()
+    {
+      if (!failed_ && !in_control_.empty ()) failed_ = true;
+
+      if (failed_) throw Group::Failed ();
+    }
+
+  private:
+    ACE_Thread_Mutex mutex_;
+    ACE_Condition<ACE_Thread_Mutex> send_cond_;
+    ACE_Condition<ACE_Thread_Mutex> recv_cond_;
+
+    typedef ACE_Guard<ACE_Thread_Mutex> AutoLock;
+
+    bool failed_;
+
+    MessageQueue  in_send_data_;
+    MessageQueue  in_recv_data_;
+    MessageQueue  in_control_;
+
+    auto_ptr<Scheduler> scheduler_;
+
+    MessageQueue& out_data_;
+  };
+
+
+  // Group
+  //
+  //
+  Group::
+  Group (ACE_INET_Addr const& addr, char const* id)
+    throw (Failed)
+      : pimpl_ (new GroupImpl (addr, id))
+  {
+  }
+
+  Group::
+  ~Group ()
+  {
+  }
+
+  void Group::
+  send (void const* msg, size_t size) throw (InvalidArg, Failed, Aborted)
+  {
+    pimpl_->send (msg, size);
+  }
+
+  size_t Group::
+  recv (void* msg, size_t size) throw (Failed, InsufficienSpace)
+  {
+    return pimpl_->recv (msg, size);
+  }
+}
diff --git a/protocols/ace/TMCast/Group.hpp b/protocols/ace/TMCast/Group.hpp
new file mode 100644
index 00000000000..416cea0a17d
--- /dev/null
+++ b/protocols/ace/TMCast/Group.hpp
@@ -0,0 +1,51 @@
+// file      : TMCast/Group.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_GROUP_HPP
+#define TMCAST_GROUP_HPP
+
+#include <ace/Auto_Ptr.h>
+#include <ace/INET_Addr.h>
+
+#include "Export.hpp"
+
+namespace TMCast
+{
+  class TMCast_Export Group
+  {
+  public:
+    class Aborted {};
+    class Failed {};
+    class InvalidArg {};
+    class InsufficienSpace {};
+
+  public:
+    ~Group ();
+
+    Group (ACE_INET_Addr const& addr, char const* id) throw (Failed);
+
+  public:
+    void
+    send (void const* msg, size_t size) throw (InvalidArg, Failed, Aborted);
+
+    size_t
+    recv (void* msg, size_t size) throw (Failed, InsufficienSpace);
+
+  private:
+    bool
+    failed ();
+
+  private:
+    class GroupImpl;
+    auto_ptr<GroupImpl> pimpl_;
+
+  private:
+    Group (Group const&);
+
+    Group&
+    operator= (Group const&);
+  };
+}
+
+#endif // TMCAST_GROUP_HPP
diff --git a/protocols/ace/TMCast/GroupFwd.hpp b/protocols/ace/TMCast/GroupFwd.hpp
new file mode 100644
index 00000000000..beba06df79d
--- /dev/null
+++ b/protocols/ace/TMCast/GroupFwd.hpp
@@ -0,0 +1,15 @@
+// file      : TMCast/GroupFwd.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_GROUP_FWD_HPP
+#define TMCAST_GROUP_FWD_HPP
+
+#include "Export.hpp"
+
+namespace TMCast
+{
+  class TMCast_Export Group;
+}
+
+#endif // TMCAST_GROUP_FWD_HPP
diff --git a/protocols/ace/TMCast/LinkListener.hpp b/protocols/ace/TMCast/LinkListener.hpp
new file mode 100644
index 00000000000..990f9e8f803
--- /dev/null
+++ b/protocols/ace/TMCast/LinkListener.hpp
@@ -0,0 +1,166 @@
+// file      : TMCast/LinkListener.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+// OS primitives
+#include <ace/Synch.h>
+#include <ace/SOCK_Dgram_Mcast.h>
+#include <ace/Refcounted_Auto_Ptr.h>
+
+
+#include "Messaging.hpp"
+
+namespace TMCast
+{
+  //
+  //
+  //
+  class LinkFailure : public virtual Message {};
+
+
+  //
+  //
+  //
+  class LinkData : public virtual Message
+  {
+  public:
+    LinkData (Protocol::MessageHeader const* header,
+              void* payload,
+              size_t size)
+        : size_ (size)
+    {
+      ACE_OS::memcpy (&header_, header, sizeof (Protocol::MessageHeader));
+      ACE_OS::memcpy (payload_, payload, size_);
+    }
+
+    Protocol::MessageHeader const&
+    header () const
+    {
+      return header_;
+    }
+
+    void const*
+    payload () const
+    {
+      return payload_;
+    }
+
+    size_t
+    size () const
+    {
+      return size_;
+    }
+
+  private:
+    Protocol::MessageHeader header_;
+    char payload_[Protocol::MAX_MESSAGE_SIZE];
+    size_t size_;
+  };
+
+  typedef
+  ACE_Refcounted_Auto_Ptr<LinkData, ACE_Null_Mutex>
+  LinkDataPtr;
+
+  //
+  //
+  //
+  class LinkListener
+  {
+  private:
+    class Terminate : public virtual Message {};
+
+  public:
+    LinkListener (ACE_SOCK_Dgram_Mcast& sock, MessageQueue& out)
+        : sock_(sock), out_ (out)
+    {
+      if (ACE_OS::thr_create (&thread_thunk,
+                              this,
+                              THR_JOINABLE,
+                              &thread_) != 0) ::abort ();
+    }
+
+    ~LinkListener ()
+    {
+      {
+        MessageQueueAutoLock lock (control_);
+
+        control_.push (MessagePtr (new Terminate));
+      }
+
+      if (ACE_OS::thr_join (thread_, 0) != 0) ::abort ();
+
+      // cerr << "Link listener is down." << endl;
+    }
+
+
+    static void*
+    thread_thunk (void* arg)
+    {
+      LinkListener* obj = reinterpret_cast<LinkListener*> (arg);
+
+      obj->execute ();
+      return 0;
+    }
+
+    void
+    execute ()
+    {
+      char msg[Protocol::MAX_MESSAGE_SIZE];
+
+      ssize_t header_size = sizeof (Protocol::MessageHeader);
+
+      // OS::Time timeout (1000000); // one millisecond
+
+      ACE_Time_Value timeout (0, 1000); // one millisecond
+
+      try
+      {
+        while (true)
+        {
+          // Check control message queue
+
+          {
+            MessageQueueAutoLock lock (control_);
+
+            if (!control_.empty ()) break;
+          }
+
+          ACE_Addr junk;
+          ssize_t n = sock_.recv (msg,
+                                  Protocol::MAX_MESSAGE_SIZE,
+                                  junk,
+                                  0,
+                                  &timeout);
+
+          if (n != -1)
+          {
+            if (n < header_size) throw false;
+
+            Protocol::MessageHeader* header =
+              reinterpret_cast<Protocol::MessageHeader*> (msg);
+
+            MessageQueueAutoLock lock (out_);
+
+            out_.push (MessagePtr (new LinkData (header,
+                                                 msg + header_size,
+                                                 n - header_size)));
+          }
+        }
+      }
+      catch (...)
+      {
+        MessageQueueAutoLock lock (out_);
+
+        out_.push (MessagePtr (new LinkFailure));
+      }
+    }
+
+  private:
+    typedef ACE_Guard<ACE_Thread_Mutex> AutoLock;
+
+    ACE_thread_t thread_;
+    ACE_SOCK_Dgram_Mcast& sock_;
+    MessageQueue& out_;
+    MessageQueue  control_;
+  };
+}
diff --git a/protocols/ace/TMCast/MTQueue.hpp b/protocols/ace/TMCast/MTQueue.hpp
new file mode 100644
index 00000000000..d593c034723
--- /dev/null
+++ b/protocols/ace/TMCast/MTQueue.hpp
@@ -0,0 +1,177 @@
+// file      : TMCast/MTQueue.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_MT_QUEUE_HPP
+#define TMCAST_MT_QUEUE_HPP
+
+#include "ace/Auto_Ptr.h"
+#include "ace/Unbounded_Set.h"
+#include "ace/Unbounded_Queue.h"
+
+namespace TMCast
+{
+  template <typename T,
+            typename M,
+            typename C,
+            typename Q = ACE_Unbounded_Queue<T> >
+  class MTQueue
+  {
+  public:
+    typedef T ElementType;
+    typedef M MutexType;
+    typedef C ConditionalType;
+    typedef Q QueueType;
+
+  public:
+
+    MTQueue (std::size_t hint = 0)
+        : mutexp_ (new MutexType),
+          mutex_ (*mutexp_),
+          // queue_ (hint),
+          queue_ (),
+          signal_ (false)
+    {
+    }
+
+    MTQueue (MutexType& mutex, std::size_t hint = 0)
+        : mutexp_ (),
+          mutex_ (mutex),
+          // queue_ (hint),
+          queue_ (),
+          signal_ (false)
+    {
+    }
+
+  public:
+    bool
+    empty () const
+    {
+      return queue_.is_empty ();
+    }
+
+    std::size_t
+    size () const
+    {
+      return queue_.size ();
+    }
+
+    // typedef typename QueueType::Empty Empty;
+
+    class Empty {};
+
+    T&
+    front ()
+    {
+      ACE_Unbounded_Queue_Iterator<T> f (queue_);
+      T* tmp;
+      if (!f.next (tmp)) throw Empty ();
+
+      return *tmp;
+    }
+
+
+    T const&
+    front () const
+    {
+      ACE_Unbounded_Queue_Const_Iterator<T> f (queue_);
+      T* tmp;
+      if (!f.next (tmp)) throw Empty ();
+
+      return *tmp;
+    }
+
+    /*
+      T&
+      back ()
+      {
+      return queue_.back ();
+      }
+
+
+      T const&
+      back () const
+      {
+      return queue_.back ();
+      }
+    */
+
+    void
+    push (T const& t)
+    {
+      signal_ = empty ();
+      queue_.enqueue_tail (t);
+    }
+
+    void
+    pop ()
+    {
+      T junk;
+      queue_.dequeue_head (junk);
+    }
+
+  public:
+    void
+    lock () const
+    {
+      mutex_.acquire ();
+    }
+
+    void
+    unlock () const
+    {
+      if (signal_)
+      {
+        signal_ = false;
+
+        for (ConditionalSetConstIterator_ i (cond_set_);
+             !i.done ();
+             i.advance ())
+        {
+          ConditionalType** c;
+
+          i.next (c);
+
+          (*c)->signal ();
+        }
+      }
+
+      mutex_.release ();
+    }
+
+    void
+    subscribe (ConditionalType& c)
+    {
+      //@@ should check for duplicates
+      //
+      cond_set_.insert (&c);
+    }
+
+    void
+    unsubscribe (ConditionalType& c)
+    {
+      //@@ should check for absence
+      //
+      cond_set_.remove (&c);
+    }
+
+  private:
+    auto_ptr<MutexType> mutexp_;
+    mutable MutexType& mutex_;
+    QueueType queue_;
+
+    typedef
+    ACE_Unbounded_Set<ConditionalType*>
+    ConditionalSet_;
+
+    typedef
+    ACE_Unbounded_Set_Const_Iterator<ConditionalType*>
+    ConditionalSetConstIterator_;
+
+    ConditionalSet_ cond_set_;
+
+    mutable bool signal_;
+  };
+}
+
+#endif // TMCAST_MT_QUEUE_HPP
diff --git a/protocols/ace/TMCast/Makefile b/protocols/ace/TMCast/Makefile
new file mode 100644
index 00000000000..87f6d1964ba
--- /dev/null
+++ b/protocols/ace/TMCast/Makefile
@@ -0,0 +1,221 @@
+#----------------------------------------------------------------------------
+#
+# $Id$
+#
+#----------------------------------------------------------------------------
+
+MAKEFILE = Makefile
+LIB      = libTMCast.a
+SHLIB    = libTMCast.$(SOEXT)
+
+FILES= Group Protocol
+
+LIBS=$(ACELIB)
+
+#----------------------------------------------------------------------------
+#       Include macros and targets
+#----------------------------------------------------------------------------
+
+include $(ACE_ROOT)/include/makeinclude/wrapper_macros.GNU
+
+LSRC  = $(addsuffix .cpp,$(FILES))
+
+include $(ACE_ROOT)/include/makeinclude/macros.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.common.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.nonested.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.lib.GNU
+include $(ACE_ROOT)/include/makeinclude/rules.local.GNU
+
+#----------------------------------------------------------------------------
+#       Local targets
+#----------------------------------------------------------------------------
+
+ifeq ($(shared_libs),1)
+ifneq ($(SHLIB),)
+CPPFLAGS     += -DTMCAST_BUILD_DLL
+endif
+endif
+
+#----------------------------------------------------------------------------
+#       Dependencies
+#----------------------------------------------------------------------------
+# DO NOT DELETE THIS LINE -- g++dep uses it.
+# DO NOT PUT ANYTHING AFTER THIS LINE, IT WILL GO AWAY.
+
+
+.obj/Group.o .obj/Group.so .shobj/Group.o .shobj/Group.so: Group.cpp Group.hpp \
+  $(ACE_ROOT)/ace/Auto_Ptr.h \
+  $(ACE_ROOT)/ace/pre.h \
+  $(ACE_ROOT)/ace/post.h \
+  $(ACE_ROOT)/ace/ace_wchar.h \
+  $(ACE_ROOT)/ace/ace_wchar.inl \
+  $(ACE_ROOT)/ace/Auto_Ptr.i \
+  $(ACE_ROOT)/ace/Global_Macros.h \
+  $(ACE_ROOT)/ace/OS_Export.h \
+  $(ACE_ROOT)/ace/Auto_Ptr.cpp \
+  $(ACE_ROOT)/ace/INET_Addr.h \
+  $(ACE_ROOT)/ace/Sock_Connect.h \
+  $(ACE_ROOT)/ace/ACE_export.h \
+  $(ACE_ROOT)/ace/Basic_Types.h \
+  $(ACE_ROOT)/ace/os_include/os_limits.h \
+  $(ACE_ROOT)/ace/os_include/os_unistd.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_types.h \
+  $(ACE_ROOT)/ace/os_include/os_stddef.h \
+  $(ACE_ROOT)/ace/os_include/os_inttypes.h \
+  $(ACE_ROOT)/ace/os_include/os_stdint.h \
+  $(ACE_ROOT)/ace/os_include/os_stdio.h \
+  $(ACE_ROOT)/ace/os_include/os_stdarg.h \
+  $(ACE_ROOT)/ace/os_include/os_float.h \
+  $(ACE_ROOT)/ace/os_include/os_stdlib.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_wait.h \
+  $(ACE_ROOT)/ace/os_include/os_signal.h \
+  $(ACE_ROOT)/ace/os_include/os_time.h \
+  $(ACE_ROOT)/ace/os_include/os_ucontext.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_resource.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_time.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_select.h \
+  $(ACE_ROOT)/ace/Basic_Types.i \
+  $(ACE_ROOT)/ace/os_include/netinet/os_in.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_socket.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_uio.h \
+  $(ACE_ROOT)/ace/Sock_Connect.i \
+  $(ACE_ROOT)/ace/Addr.h \
+  $(ACE_ROOT)/ace/Addr.i \
+  $(ACE_ROOT)/ace/INET_Addr.i \
+  $(ACE_ROOT)/ace/OS.h \
+  $(ACE_ROOT)/ace/OS_Dirent.h \
+  $(ACE_ROOT)/ace/OS_Errno.h \
+  $(ACE_ROOT)/ace/os_include/os_errno.h \
+  $(ACE_ROOT)/ace/OS_Errno.inl \
+  $(ACE_ROOT)/ace/os_include/os_dirent.h \
+  $(ACE_ROOT)/ace/OS_Dirent.inl \
+  $(ACE_ROOT)/ace/OS_String.h \
+  $(ACE_ROOT)/ace/OS_String.inl \
+  $(ACE_ROOT)/ace/os_include/os_string.h \
+  $(ACE_ROOT)/ace/os_include/os_strings.h \
+  $(ACE_ROOT)/ace/os_include/os_ctype.h \
+  $(ACE_ROOT)/ace/OS_Memory.h \
+  $(ACE_ROOT)/ace/OS_Memory.inl \
+  $(ACE_ROOT)/ace/OS_TLI.h \
+  $(ACE_ROOT)/ace/OS_TLI.inl \
+  $(ACE_ROOT)/ace/os_include/os_dlfcn.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_mman.h \
+  $(ACE_ROOT)/ace/os_include/os_netdb.h \
+  $(ACE_ROOT)/ace/os_include/net/os_if.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_sem.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_ipc.h \
+  $(ACE_ROOT)/ace/Time_Value.h \
+  $(ACE_ROOT)/ace/Time_Value.inl \
+  $(ACE_ROOT)/ace/Default_Constants.h \
+  $(ACE_ROOT)/ace/Min_Max.h \
+  $(ACE_ROOT)/ace/os_include/os_pthread.h \
+  $(ACE_ROOT)/ace/os_include/os_assert.h \
+  $(ACE_ROOT)/ace/os_include/os_fcntl.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_stat.h \
+  $(ACE_ROOT)/ace/iosfwd.h \
+  $(ACE_ROOT)/ace/os_include/arpa/os_inet.h \
+  $(ACE_ROOT)/ace/os_include/netinet/os_tcp.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_shm.h \
+  $(ACE_ROOT)/ace/os_include/os_pwd.h \
+  $(ACE_ROOT)/ace/os_include/os_stropts.h \
+  $(ACE_ROOT)/ace/os_include/os_termios.h \
+  $(ACE_ROOT)/ace/os_include/os_aio.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_un.h \
+  $(ACE_ROOT)/ace/os_include/os_poll.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_msg.h \
+  $(ACE_ROOT)/ace/os_include/sys/os_utsname.h \
+  $(ACE_ROOT)/ace/os_include/os_syslog.h \
+  $(ACE_ROOT)/ace/OS.i Export.hpp \
+  $(ACE_ROOT)/ace/Synch.h \
+  $(ACE_ROOT)/ace/Auto_Event.h \
+  $(ACE_ROOT)/ace/Event.h \
+  $(ACE_ROOT)/ace/Event.inl \
+  $(ACE_ROOT)/ace/Auto_Event.inl \
+  $(ACE_ROOT)/ace/Barrier.h \
+  $(ACE_ROOT)/ace/Condition_Thread_Mutex.h \
+  $(ACE_ROOT)/ace/Thread_Mutex.h \
+  $(ACE_ROOT)/ace/Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Condition_Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Barrier.inl \
+  $(ACE_ROOT)/ace/Condition_Recursive_Thread_Mutex.h \
+  $(ACE_ROOT)/ace/Recursive_Thread_Mutex.h \
+  $(ACE_ROOT)/ace/Recursive_Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Condition_Recursive_Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Lock.h \
+  $(ACE_ROOT)/ace/Lock.inl \
+  $(ACE_ROOT)/ace/Manual_Event.h \
+  $(ACE_ROOT)/ace/Manual_Event.inl \
+  $(ACE_ROOT)/ace/Mutex.h \
+  $(ACE_ROOT)/ace/Mutex.inl \
+  $(ACE_ROOT)/ace/Null_Barrier.h \
+  $(ACE_ROOT)/ace/Null_Condition.h \
+  $(ACE_ROOT)/ace/Null_Mutex.h \
+  $(ACE_ROOT)/ace/Null_Semaphore.h \
+  $(ACE_ROOT)/ace/RW_Mutex.h \
+  $(ACE_ROOT)/ace/RW_Mutex.inl \
+  $(ACE_ROOT)/ace/RW_Thread_Mutex.h \
+  $(ACE_ROOT)/ace/RW_Thread_Mutex.inl \
+  $(ACE_ROOT)/ace/Semaphore.h \
+  $(ACE_ROOT)/ace/Semaphore.inl \
+  $(ACE_ROOT)/ace/Thread_Semaphore.h \
+  $(ACE_ROOT)/ace/Thread_Semaphore.inl \
+  $(ACE_ROOT)/ace/TSS_Adapter.h \
+  $(ACE_ROOT)/ace/TSS_Adapter.inl \
+  $(ACE_ROOT)/ace/Synch.i \
+  $(ACE_ROOT)/ace/Synch_T.h \
+  $(ACE_ROOT)/ace/Lock_Adapter_T.h \
+  $(ACE_ROOT)/ace/Lock_Adapter_T.inl \
+  $(ACE_ROOT)/ace/Lock_Adapter_T.cpp \
+  $(ACE_ROOT)/ace/Reverse_Lock_T.h \
+  $(ACE_ROOT)/ace/Reverse_Lock_T.inl \
+  $(ACE_ROOT)/ace/Reverse_Lock_T.cpp \
+  $(ACE_ROOT)/ace/Guard_T.h \
+  $(ACE_ROOT)/ace/Guard_T.inl \
+  $(ACE_ROOT)/ace/Guard_T.cpp \
+  $(ACE_ROOT)/ace/TSS_T.h \
+  $(ACE_ROOT)/ace/TSS_T.inl \
+  $(ACE_ROOT)/ace/TSS_T.cpp \
+  $(ACE_ROOT)/ace/Thread.h \
+  $(ACE_ROOT)/ace/Thread_Adapter.h \
+  $(ACE_ROOT)/ace/Base_Thread_Adapter.h \
+  $(ACE_ROOT)/ace/OS_Log_Msg_Attributes.h \
+  $(ACE_ROOT)/ace/OS_Log_Msg_Attributes.inl \
+  $(ACE_ROOT)/ace/Base_Thread_Adapter.inl \
+  $(ACE_ROOT)/ace/Thread_Adapter.inl \
+  $(ACE_ROOT)/ace/Thread.i \
+  $(ACE_ROOT)/ace/Log_Msg.h \
+  $(ACE_ROOT)/ace/Log_Priority.h \
+  $(ACE_ROOT)/ace/Condition_T.h \
+  $(ACE_ROOT)/ace/Condition_T.inl \
+  $(ACE_ROOT)/ace/Condition_T.cpp \
+  $(ACE_ROOT)/ace/Synch_Traits.h \
+  $(ACE_ROOT)/ace/Synch_T.i \
+  $(ACE_ROOT)/ace/Synch_T.cpp \
+  $(ACE_ROOT)/ace/SOCK_Dgram_Mcast.h \
+  $(ACE_ROOT)/ace/SOCK_Dgram.h \
+  $(ACE_ROOT)/ace/SOCK.h \
+  $(ACE_ROOT)/ace/IPC_SAP.h \
+  $(ACE_ROOT)/ace/Flag_Manip.h \
+  $(ACE_ROOT)/ace/Flag_Manip.i \
+  $(ACE_ROOT)/ace/IPC_SAP.i \
+  $(ACE_ROOT)/ace/SOCK.i \
+  $(ACE_ROOT)/ace/SOCK_Dgram.i \
+  $(ACE_ROOT)/ace/SOCK_Dgram_Mcast.i \
+  Messaging.hpp \
+  $(ACE_ROOT)/ace/Refcounted_Auto_Ptr.h \
+  $(ACE_ROOT)/ace/Refcounted_Auto_Ptr.i \
+  MTQueue.hpp $(ACE_ROOT)/ace/Unbounded_Set.h \
+  $(ACE_ROOT)/ace/Node.h \
+  $(ACE_ROOT)/ace/Node.cpp \
+  $(ACE_ROOT)/ace/Unbounded_Set.inl \
+  $(ACE_ROOT)/ace/Unbounded_Set.cpp \
+  $(ACE_ROOT)/ace/Malloc_Base.h \
+  $(ACE_ROOT)/ace/Unbounded_Queue.h \
+  $(ACE_ROOT)/ace/Unbounded_Queue.inl \
+  $(ACE_ROOT)/ace/Unbounded_Queue.cpp \
+  Protocol.hpp LinkListener.hpp FaultDetector.hpp \
+  TransactionController.hpp
+
+.obj/Protocol.o .obj/Protocol.so .shobj/Protocol.o .shobj/Protocol.so: Protocol.cpp Protocol.hpp
+
+# IF YOU PUT ANYTHING HERE IT WILL GO AWAY
diff --git a/protocols/ace/TMCast/Messaging.hpp b/protocols/ace/TMCast/Messaging.hpp
new file mode 100644
index 00000000000..6a1000c3265
--- /dev/null
+++ b/protocols/ace/TMCast/Messaging.hpp
@@ -0,0 +1,54 @@
+// file      : TMCast/Messaging.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_MESSAGING_HPP
+#define TMCAST_MESSAGING_HPP
+
+#include <ace/Synch.h>
+#include <ace/Refcounted_Auto_Ptr.h>
+
+#include "MTQueue.hpp"
+
+namespace TMCast
+{
+  class Message
+  {
+  public:
+    virtual
+    ~Message () {}
+  };
+
+  typedef
+  ACE_Refcounted_Auto_Ptr<Message, ACE_Null_Mutex>
+  MessagePtr;
+
+  typedef
+  MTQueue<MessagePtr, ACE_Thread_Mutex, ACE_Condition<ACE_Thread_Mutex> >
+  MessageQueue;
+
+  struct MessageQueueAutoLock
+  {
+    MessageQueueAutoLock (MessageQueue& q)
+        : q_ (q)
+    {
+      q_.lock ();
+    }
+
+    void
+    unlock ()
+    {
+      q_.unlock ();
+    }
+
+    ~MessageQueueAutoLock ()
+    {
+    q_.unlock ();
+    }
+
+  private:
+    MessageQueue& q_;
+  };
+}
+
+#endif // TMCAST_MESSAGING_HPP
diff --git a/protocols/ace/TMCast/Protocol.cpp b/protocols/ace/TMCast/Protocol.cpp
new file mode 100644
index 00000000000..78563281694
--- /dev/null
+++ b/protocols/ace/TMCast/Protocol.cpp
@@ -0,0 +1,31 @@
+// file      : TMCast/Protocol.cpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#include "Protocol.hpp"
+
+namespace TMCast
+{
+  namespace Protocol
+  {
+    namespace
+    {
+      char const* labels[] = {
+        "NONE", "BEGIN", "COMMIT", "ABORT", "COMMITED", "ABORTED"};
+    }
+
+    /*
+      std::string
+      tslabel (Protocol::TransactionStatus s)
+      {
+      return labels[s];
+      }
+
+      std::ostream&
+      operator << (std::ostream& o, Transaction const& t)
+      {
+      return o << "{" << t.id << "; " << tslabel (t.status) << "}";
+      }
+    */
+  }
+}
diff --git a/protocols/ace/TMCast/Protocol.hpp b/protocols/ace/TMCast/Protocol.hpp
new file mode 100644
index 00000000000..d5ae6a50cd6
--- /dev/null
+++ b/protocols/ace/TMCast/Protocol.hpp
@@ -0,0 +1,107 @@
+// file      : TMCast/Protocol.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#ifndef TMCAST_PROTOCOL_HPP
+#define TMCAST_PROTOCOL_HPP
+
+namespace TMCast
+{
+  namespace Protocol
+  {
+    //
+    //
+    //
+    unsigned long const MEMBER_ID_LENGTH = 38;
+
+    struct MemberId
+    {
+      char id[MEMBER_ID_LENGTH];
+      /*
+        unsigned long  ip;
+        unsigned short port;
+      */
+    };
+
+    //
+    //
+    //
+    typedef unsigned short TransactionId;
+
+
+
+    typedef unsigned char  TransactionStatus;
+
+    TransactionStatus const TS_BEGIN    = 1;
+    TransactionStatus const TS_COMMIT   = 2;
+    TransactionStatus const TS_ABORT    = 3;
+    TransactionStatus const TS_COMMITED = 4;
+    TransactionStatus const TS_ABORTED  = 5;
+
+    struct Transaction
+    {
+      TransactionId id;
+      TransactionStatus status;
+    };
+
+    // Transaction List (TL)
+
+    // unsigned long const TL_LENGTH = 1;
+
+    // typedef Transaction TransactionList[TL_LENGTH];
+
+
+    //
+    //
+    //
+    struct MessageHeader
+    {
+      unsigned long length;
+
+      unsigned long check_sum;
+
+      MemberId member_id;
+
+      Transaction current;
+
+      //TransactionList transaction_list;
+    };
+
+
+    //
+    //
+    //
+
+    unsigned long const MAX_MESSAGE_SIZE = 768;
+
+    unsigned long const
+    MAX_PAYLOAD_SIZE = MAX_MESSAGE_SIZE - sizeof (MessageHeader);
+
+    // Protocol timing
+    //
+    //
+
+    unsigned long const SYNC_PERIOD = 30000;    // in mks
+
+    unsigned short const VOTING_FRAME = 4;      // in SYNC_PERIOD's
+    unsigned short const SEPARATION_FRAME = 5;  // in SYNC_PERIOD's
+
+    // FATAL_SILENCE_FRAME in SYNC_PERIOD's
+    // Generally it's a good idea to set it to < VOTING_FRAME + SEPARATION_FRAME
+    //
+
+    short const FATAL_SILENCE_FRAME = VOTING_FRAME + SEPARATION_FRAME - 2;
+
+    // short const FATAL_SILENCE_FRAME = 10000;
+
+    // Helpers
+
+    // std::string
+    // tslabel (Protocol::TransactionStatus s);
+
+    // std::ostream&
+    // operator << (std::ostream& o, Transaction const& t);
+  }
+}
+
+#endif // TMCAST_PROTOCOL_HPP
diff --git a/protocols/ace/TMCast/README b/protocols/ace/TMCast/README
new file mode 100644
index 00000000000..d061c7b2cba
--- /dev/null
+++ b/protocols/ace/TMCast/README
@@ -0,0 +1,58 @@
+
+
+Architecture
+
+TMCast (stands for Transaction MultiCast) is an implementation of a
+transactional multicast protocol. In essence, the idea is to represent
+message delivery to members of a multicast group as a transaction - 
+atomic, consistent and isolated action. Multicast transaction can
+be viewed as an atomic transition of group members to a new state. 
+If we define Mo as a set of operational (non-faulty) members of the 
+group, Mf as a set of faulty members of the group, Ma as a set of 
+members that view transition Tn as aborted and Mc as a set of members
+that view transition Tn as committed, then this atomic transition Tn
+can be described as one of the following:
+
+Mo(Tn-1) = Ma(T) U Mf(T)
+Mo(Tn-1) = Mc(T) U Mf(T)
+
+Or, in other words, after transaction T has been committed (aborted), 
+all operational (before transaction T) members are either in 
+committed (aborted) or failed state.
+
+Thus, for each member of the group, outcome of the transaction can
+be commit, abort or member failure. It is important for a member
+to exhibit a failfast (error latency is less than transaction cycle) 
+behavior. Or, in other words, if the member transitioned into a wrong 
+state, it is guaranteed to fail instead of delivering wrong result.
+
+In order to achieve such error detection in decentralized environment,
+certain limitations should be imposed. One of the most user-visible
+limitation is the fact that the lifetime of the group with only
+one member is very short. This is because there is not way for a 
+member to distinguish "no members yet" case from "my link to the
+group is down". In such situation, the member assumes the latter case. 
+There is also a military saying that puts it quite nicely: two is one, 
+one is nothing.
+
+
+State of Implementation
+
+Current implementation is in prototypical stage. The following parts 
+are not implemented or still under development:
+
+* Handling of network partitioning (TODO)
+
+* Redundant network support (TODO)
+
+* Member failure detection (partial implementation)
+
+
+Examples
+
+There is a simple example available in examples/TMCast/Member with 
+corresponding README.
+
+
+-- 
+Boris Kolpackov <boris@dre.vanderbilt.edu>
\ No newline at end of file
diff --git a/protocols/ace/TMCast/TransactionController.hpp b/protocols/ace/TMCast/TransactionController.hpp
new file mode 100644
index 00000000000..66c924faaf1
--- /dev/null
+++ b/protocols/ace/TMCast/TransactionController.hpp
@@ -0,0 +1,384 @@
+// file      : TMCast/TransactionController.hpp
+// author    : Boris Kolpackov <boris@dre.vanderbilt.edu>
+// cvs-id    : $Id$
+
+#include <ace/Synch.h>
+#include <ace/Refcounted_Auto_Ptr.h>
+
+#include "Protocol.hpp"
+#include "Messaging.hpp"
+
+namespace TMCast
+{
+
+  // Messages
+  //
+  //
+  class Send : public virtual Message
+  {
+  public:
+    Send (void const* msg, size_t size)
+        : size_ (size)
+    {
+      ACE_OS::memcpy (payload_, msg, size_);
+    }
+
+    void const*
+    payload () const
+    {
+      return payload_;
+    }
+
+    size_t
+    size () const
+    {
+      return size_;
+    }
+
+  private:
+    size_t size_;
+    char payload_[Protocol::MAX_PAYLOAD_SIZE];
+  };
+
+  typedef
+  ACE_Refcounted_Auto_Ptr<Send, ACE_Null_Mutex>
+  SendPtr;
+
+
+  class Recv : public virtual Message
+  {
+  public:
+    Recv (void const* msg, size_t size)
+        : size_ (size)
+    {
+      ACE_OS::memcpy (payload_, msg, size_);
+    }
+
+    void const*
+    payload () const
+    {
+      return payload_;
+    }
+
+    size_t
+    size () const
+    {
+      return size_;
+    }
+
+  private:
+    size_t size_;
+    char payload_[Protocol::MAX_PAYLOAD_SIZE];
+  };
+
+  typedef
+  ACE_Refcounted_Auto_Ptr<Recv, ACE_Null_Mutex>
+  RecvPtr;
+
+  class Aborted : public virtual Message {};
+
+  class Commited : public virtual Message {};
+
+
+  //
+  //
+  //
+  class TransactionController
+  {
+  public:
+    TransactionController (MessageQueue& in,
+                           MessageQueue& send_out,
+                           MessageQueue& recv_out)
+        : trace_ (false),
+          voting_duration_ (0),
+          separation_duration_ (0),
+          in_ (in),
+          send_out_ (send_out),
+          recv_out_ (recv_out)
+    {
+      current_.id = 0;
+      current_.status = Protocol::TS_COMMITED;
+    }
+
+  public:
+    class Failure {};
+
+
+    void
+    outsync (Protocol::Transaction& c, void* payload, size_t& size)
+    {
+      if (current_.status == Protocol::TS_COMMIT ||
+          current_.status == Protocol::TS_ABORT)
+      {
+        if (++voting_duration_ >= Protocol::VOTING_FRAME)
+        {
+          // end of voting frame
+
+          if (current_.status == Protocol::TS_COMMIT)
+          {
+            {
+              if (initiated_)
+              {
+                MessageQueueAutoLock lock (send_out_);
+                send_out_.push (MessagePtr (new Commited));
+              }
+              else // joined transaction
+              {
+                MessageQueueAutoLock lock (recv_out_);
+                recv_out_.push (MessagePtr (recv_.release ()));
+                recv_ = RecvPtr ();
+              }
+            }
+
+            current_.status = Protocol::TS_COMMITED;
+
+            // if (trace_) cerr << "commited transaction with id "
+            //                  << current_.id << endl;
+          }
+          else // TS_ABORT
+          {
+            if (initiated_)
+            {
+              MessageQueueAutoLock lock (send_out_);
+              send_out_.push (MessagePtr (new Aborted));
+            }
+            else
+            {
+              // free revc_ buffer if necessary
+              //
+              if (recv_.get ()) recv_ = RecvPtr ();
+            }
+
+
+            current_.status = Protocol::TS_ABORTED;
+
+            // if (trace_) cerr << "aborted transaction with id "
+            //                  << current_.id << endl;
+          }
+
+          // start transaction separation frame (counts down)
+          // +1 because it will be decremented on this iteration
+          separation_duration_ = Protocol::SEPARATION_FRAME + 1;
+        }
+      }
+
+      // Set current outsync info
+
+      c.id = current_.id;
+      c.status = current_.status;
+
+
+      // Do some post-processing
+
+      switch (current_.status)
+      {
+      case Protocol::TS_COMMITED:
+      case Protocol::TS_ABORTED:
+        {
+          if (separation_duration_ > 0) --separation_duration_;
+          break;
+        }
+      case Protocol::TS_BEGIN:
+        {
+          // transfer payload
+
+          size = send_->size ();
+          memcpy (payload, send_->payload (), size);
+
+          send_ = SendPtr ();
+
+          // get redy to vote for 'commit'
+
+          current_.status = Protocol::TS_COMMIT;
+          voting_duration_ = 0;
+        }
+      }
+    }
+
+    void
+    current_transaction (Protocol::Transaction const& t,
+                         void const* payload,
+                         size_t size)
+    {
+      Protocol::TransactionId& id = current_.id;
+      Protocol::TransactionStatus& s = current_.status;
+
+      if (id == 0 && t.id != 0) // catch up
+      {
+        switch (t.status)
+        {
+        case Protocol::TS_BEGIN:
+        case Protocol::TS_COMMIT:
+        case Protocol::TS_ABORT:
+          {
+            id = t.id - 1;
+            s = Protocol::TS_COMMITED;
+            break;
+          }
+        case Protocol::TS_ABORTED:
+        case Protocol::TS_COMMITED:
+          {
+            id = t.id;
+            s = t.status;
+            break;
+          }
+        }
+
+        // if (trace_) cerr << "caught up with id " << id << endl;
+      }
+
+      bool stable (s == Protocol::TS_COMMITED || s == Protocol::TS_ABORTED);
+
+      switch (t.status)
+      {
+      case Protocol::TS_BEGIN:
+        {
+          if (!stable || t.id != id + 1)
+          {
+            // Transaction is in progress or hole in transaction id's
+
+            // cerr << "unexpected request to join " << t
+            //     << " while on " << current_ << endl;
+
+            // if (!stable) cerr << "voting progress is " << voting_duration_
+            //                  << "/" << Protocol::VOTING_FRAME << endl;
+
+            if (t.id == id) // collision
+            {
+              if (!stable && s != Protocol::TS_ABORT)
+              {
+                // abort both
+                // cerr << "aborting both transactions" << endl;
+
+                s = Protocol::TS_ABORT;
+                voting_duration_ = 0; //@@ reset voting frame
+              }
+            }
+            else
+            {
+              // @@ delicate case. need to think more
+
+              // cerr << "Declaring node failed." << endl;
+              throw Failure ();
+            }
+          }
+          else
+          {
+            // join the transaction
+
+            initiated_ = false;
+
+            recv_ = RecvPtr (new Recv (payload, size));
+
+            id = t.id;
+            s = Protocol::TS_COMMIT;
+            voting_duration_ = 0;
+
+            // if (trace_) cerr << "joining-for-commit transaction with id "
+            //                  << id << endl;
+          }
+          break;
+        }
+      case Protocol::TS_COMMIT:
+        {
+          if (stable && id == t.id - 1)
+          {
+            // not begin and and we haven't joined
+
+            // join for abort
+
+            initiated_ = false;
+
+            current_.id = t.id;
+            current_.status = Protocol::TS_ABORT;
+            voting_duration_ = 0;
+
+            // if (trace_) cerr << "joining-for-abort transaction with id "
+            //                  << current_.id << endl;
+          }
+          break;
+        }
+      case Protocol::TS_ABORT:
+        {
+          if ((!stable && id == t.id && s == Protocol::TS_COMMIT) ||
+              (stable && id == t.id - 1)) // abort current || new transaction
+          {
+            // if (trace_) cerr << "voting-for-abort on transaction with id "
+            //                  << current_.id << endl;
+
+            id = t.id;
+            s = Protocol::TS_ABORT;
+
+            voting_duration_ = 0; //@@ reseting voting_duration_
+          }
+          else
+          {
+          }
+
+          break;
+        }
+      case Protocol::TS_ABORTED:
+      case Protocol::TS_COMMITED:
+        {
+          // nothing for now
+          break;
+        }
+      }
+    }
+
+    void
+    api ()
+    {
+      if ((current_.status == Protocol::TS_COMMITED ||
+           current_.status == Protocol::TS_ABORTED) &&
+          separation_duration_ == 0) // no transaction in progress
+      {
+        // start new transaction
+
+        // Note that in_ is already locked by Scheduler
+
+        MessagePtr m (in_.front ());
+        in_.pop ();
+
+        if (typeid (*m) == typeid (Send))
+        {
+          send_ = SendPtr (dynamic_cast<Send*> (m.release ()));
+        }
+        else
+        {
+          // cerr << "Expecting Send but received " << typeid (*m).name ()
+          //      << endl;
+
+          ::abort ();
+        }
+
+        current_.id++;
+        current_.status = Protocol::TS_BEGIN;
+
+        initiated_ = true;
+
+        // if (trace_) cerr << "starting transaction with id " << current_.id
+        //                  << endl;
+      }
+    }
+
+  private:
+    typedef ACE_Guard<ACE_Thread_Mutex> AutoLock;
+
+    bool trace_;
+
+    Protocol::Transaction current_;
+
+    bool initiated_;
+
+    unsigned short voting_duration_;
+    unsigned short separation_duration_;
+
+    MessageQueue& in_;
+    MessageQueue& send_out_;
+    MessageQueue& recv_out_;
+
+    SendPtr send_;
+    RecvPtr recv_;
+  };
+}