path: root/ACE/NEWS

PLANNED MAJOR CHANGES "SOMETIME IN THE FUTURE" (i.e., exact beta not known)
===========================================================================

. (Remedy) OpenVMS 8.3 on IA64 port

. (Remedy) RTEMS port

USER VISIBLE CHANGES BETWEEN ACE-5.5.3 and ACE-5.5.4
====================================================

. Added appropriate intptr_t and uintptr_t typedefs on platforms that
  don't provide them (i.e. when ACE_LACKS_INTPTR_T is defined).

. Added ability to explicitly choose support for 32 bit or 64 bit file
  offsets on all platforms.  Define the _FILE_OFFSET_BITS preprocessor
  symbol to either 32 or 64 to choose the desired number of file
  offset bits.  This preprocessor symbol is supported natively by most
  UNIX and UNIX-like operating systems, and supported by ACE on
  Windows.  Use the new ACE_OFF_T typedef to refer to file offsets
  across UNIX and Windows portably.

. 64-bit file offsets are now enabled by default in Win64
  configurations.

. Improved support for 64 bit platforms (64 bit addresses, etc).

. Added STL-style traits, iterators and a swap() method to the
  ACE_Array_Base<> class template.

. Added STL-style traits and iterator accessors to the
  ACE_Hash_Map_Manager_Ex<> class template, as well as new find() and
  unbind() methods that return (as an "out" parameter) and accept
  iterators, respectively.

. Greatly improved event handler dispatch performance in
  select()-based reactors (e.g. ACE_Select_Reactor and ACE_TP_Reactor)
  for large handle sets on Windows. Previous event handler search
  were linear, and are now constant on average.

. Addressed a number of Coverity errors (CHECKED_RETURN, DEADCODE,
  LOCK, USE_AFTER_FREE, RESOURCE_LEAK, FORWARD_NULL).

. Added STL-style "element_type" trait to all ACE auto_ptr class
  templates.

. Removed support for LynxOS 3.x.

. Resolved Bugzilla #2701 to ensure fini() is called for all
  Service Objects upon calling ACE_Service_Config::close()

. VxWorks 5.5.2 has been tested, for ACE the support is exactly
  the same as for VxWorks 5.5.1. No specific defines or flags have
  to be used.

USER VISIBLE CHANGES BETWEEN ACE-5.5.2 and ACE-5.5.3
====================================================

. Added the base projects for executionmanager_stub and plan_generator.

. Added the ACE_Hash_MultiMap_Manager class and its test file.

. Changed the ACE_Synch_Options::operator[] method to return bool rather than
  int. The value returned is a yes/no indication of whether or not the
  specified option(s) are set in the object.

. Changed the prototype(s) for ACE::debug () to return (and take) a
  bool. This is consistent with the original intent for this
  feature. If you have been using it like 'ACE::debug () > 0' or
  'ACE::debug (1)', you may have to rebuild ACE. The value of the
  ACE_DEBUG environment variable can be used to specify the initial
  value for ACE::debug(), at the process start up.

. An assembler (within a C source file) based implementation for SPARC
  of atomic operations suitable for use with the
  ACE_Atomic_Op<ACE_Thread_Mutex, long> and
  ACE_Atomic_Op<ACE_Thread_Mutex, unsigned long> specializations has
  been added.  Currently, it can only be enabled by setting the
  atomic_ops_sparc make macro to 1 when using the GNUACE build system with
  the Solaris SunCC compiler.  It should be noted that this requires the
  -xarch=v8plus (or higher) be added to the CFLAGS make macro or the
  assembler code will not compile.

. The ACE_Message_Queue_Ex_N<class ACE_MESSAGE_TYPE, ACE_SYNCH_DECL> class
  is new, contributed by Guy Peleg <guy dot peleg at amdocs dot com>.
  ACE_Message_Queue_Ex_N<class ACE_MESSAGE_TYPE, ACE_SYNCH_DECL> is
  similar to ACE_Message_Queue_Ex in that the object queued is a
  template parameter. However, ACE_Message_Queue_Ex_N allows the
  enqueueing and dequeueing of multiple chained objects at once. This
  wasn't added to ACE_Message_Queue_Ex because the chained object
  functionality requires the ACE_MESSAGE_TYPE class to have a
  ACE_MESSAGE_TYPE *next (void) const method, analogous to
  ACE_Message_Block::next(), to follow the chain and this would
  probably break existing applications using ACE_Message_Queue_Ex.
  The ACE_wrappers/tests/Message_Queue_Test_Ex.cpp test has an example of
  how to use the new class.

. The selector and comparator function pointer arguments to ACE_OS::scandir()
  and ACE_Dirent_Selector are now marked as extern "C" to enforce their
  use with a C RTL function. User code that defines functions which are
  passed as the selector or comparator arguments which are not declared
  extern "C" may generate compile warnings. To resolve this, add extern "C"
  to the function's signature. See ACE_wrappers/tests/Dirent_Test.cpp for
  an example.

. To address a problem in the ACE string interface that prevented
  substring or character searches in very large strings (e.g. greater
  than the maximum value of an ssize_t type) from being correctly
  reported to the caller, the find(), rfind() and strstr() methods now
  return an unsigned integer (size_t) instead of a signed one
  (ssize_t). Affected classes include:

    * ACE_CString
    * ACE_WString
    * ACE_TString
    * ACE_NS_WString

  Unless you have been explicitly using -1 instead of npos when
  comparing the return value of find(), rfind() and strstr(), and/or
  assigning the return value to ssize_t you should not see any
  difference. A new size_type typedef has been added to the ACE string
  class to aid developers.  This typedef is analogous to the standard
  C++ string::size_type typedef.

  The ACE_String_Base<>::strstr() documentation and the default
  rfind() argument erroneously referred to -1 instead of npos. Those
  instances have been corrected.

  To summarize, a "no position" condition is denoted using the npos
  constant, not -1. It can be referred directly by scoping it with the
  appropriate string class (e.g. ACE_CString::npos, ACE_WString::npos,
  etc).

. Changing the shared library extension for hpux ia64 to ".so". On
  HP-UX 11i Version 1.5 the naming scheme is lib*.sl for PA and
  lib*.so on IPF.

. The ACE_Refcounted_Auto_Ptr reset() and release() methods were changed
  per Bugzilla #1925. They will both now detach from the underlying
  ACE_Refcounted_Auto_Ptr_Rep object; reset() will create a new one for
  the new pointer specified as its argument. This change may cause referenced
  objects to be deleted in cases where previous ACE versions would not have.

. The return type of "ACE_Refcounted_Auto_Ptr::null (void) const" changed
  from int to bool. It's possible values, true and false, have not changed.

. TTY_IO now accepts "none" as a valid parity value. Due to this change
  'parityenb' member is now deprecated and will be removed in the future.
  The users of TTY_IO class should change their code to use only 'paritymode'
  member for parity control and leave 'parityenb' unchanged (it is
  enabled by default in class constructor).

. Support for Intel C++ 9.1 on Windows and Linux

. VxWorks 6.3 support

. Fixed Bugzilla #2648 to make sure ACE_Service_Object::fini()
  is called iff ACE_Service_Object::init() succeeded, as per
  C++NPv2.

. Added preliminary support for Mac OS X 10.4 on Intel CPU's.

. Fixed Bugzilla #2602 to re-enable XML Service Configurator
  file support.

USER VISIBLE CHANGES BETWEEN ACE-5.5.1 and ACE-5.5.2
====================================================

. Added support for:
   - VxWorks 6.2 for the rtp model using pthread support
   - OpenVMS 8.2 for Alpha

. Removed code and configurations that provided support for:
   - Visual C++ 6.0 and 7.0
   - Chorus
   - pSOS
   - KAI C++ on all platforms

. Explicit template instantiation support has been removed. This effectively
  removes support for Sun Forte 6 and 7 which required explicit template
  instantiation to build ACE reliably.

. Added support for multiple independent Service Repositories through
  configuration contexts called "Gestalt". Full backwards compatibility
  is maintained through the existing ACE_Service_Config static methods,
  while direct individual repository access is enabled through instances
  of the new ACE_Service_Gestalt class. ACE_Service_Config has changed to
  a specialization of ACE_Service_Gestalt and is only responsible for the
  process-wide configuration.

. To support dynamically-sized ACE_Log_Record messages, the netsvcs
  logging components now use ACE CDR encoding and transfer mechanisms
  inspired by the examples in Chapter 4 of the C++NPv1 book.
  The client and server logging daemons in ACE 5.5.2 and forward will
  not interoperate with those in previous ACE versions.

. Added a wrapper for the sendfile API (ACE_OS::sendfile()).

. Added support for netlink sockets on Linux.

. Added a new method, ACE_Task::last_thread(). This method returns the thread
  ID (ACE_thread_t) of the last thread to exit from the ACE_Task object.
  Users checking to see if a thread is the last one out (for example, to know
  when to perform cleanup operations) should compare the current thread ID to
  the return value from last_thread(). This is a change from the previously
  recommended practice (C++NPv2, page 189) of comparing the return value of
  thr_count() with 0.

. Changed the first argument to ACE_OS::strptime() to be 'const' which
  matches its usual usage in POSIX strptime(). This change allows users to
  pass const strings in - a common use case.

. Made part of the file support in ACE 64bit but we have some places where
  32bit types are used, this could lead to some conversion warnings which
  will be addressed in the near future, but getting everything 64bit
  compliant is a lot of work.

USER VISIBLE CHANGES BETWEEN ACE-5.5 and ACE-5.5.1
====================================================

. Added support for the --enable-symbol-visibility configure option
  to the autoconf build infrastructure instead of solely relying on
  feature tests to enable/disable symbol visibility support.  This
  avoids build problems with icc, etc.

. Added support for the --enable-fl-reactor configure option to the
  autoconf build infrastructure to build the ACE_FlReactor library.

. Added support for the --enable-qt-reactor configure option to the
  autoconf build infrastructure to build the ACE_QtReactor library.

. Added support for the --enable-xt-reactor configure option to the
  autoconf build infrastructure to build the ACE_XtReactor library.

. Fixed a bug that would cause timer IDs from ACE_Timer_Heap to be
  improperly duplicated under certain conditions (Bugzilla #2447).

. Fixed ACE_SSL_Context::private_key(), context(), and dh_params() methods
  to allow retrying a file load after a failed call.

. Fixed ACE_SSL_Asynch_Stream so it can be instantiated; also moved the
  declarations for ACE_SSL_Asynch_Read_Stream_Result,
  ACE_SSL_Asynch_Write_Stream_Result, and ACE_SSL_Asynch_Result classes
  to the ace/SSL/SSL_Asynch_Stream.h file so applications can see them.

USER VISIBLE CHANGES BETWEEN ACE-5.4.10 and ACE-5.5
====================================================

. Added a platform macros option "templates=manual", currently only
  applies to AIX 5.3 with XL 7 compiler.  It allows the user to tell the
  compiler to set -qnotempinc and -qnotemplateregistry and works well
  in static builds.

. ACE and its tests compile error free with GCC 4.1 pre release.

. ACE_Recursive_Thread_Mutex::get_nesting_level() fixed for 64-bit Windows
  XP on amd64/EM64T hardware.

. Many build-time fixes for Windows Mobile 5 and Windows PocketPC 2003 using
  Visual Studio .NET 2005 (VC8).

. Added support for the --enable-tk-reactor configure option to the
  autoconf build infrastructure to build the ACE_TkReactor library.

USER VISIBLE CHANGES BETWEEN ACE-5.4.9 and ACE-5.4.10
====================================================

. Fixed a bug in ACE_Timer_Heap_T::cancel().

. Improved ACE_Time_Value support for boundary conditions.

. Fixed problems with operator placement delete on certain C++ compilers.

. Fixed a bug with the ACE_SPIPE_Acceptor on Windows.

. Correctly set sockaddr_in.sin_len and sockaddr_in6.sin6_len on
  platforms that have these fields.

. Avoided problems with namespace pollution for max() macros.

. Many fixes for ACE_LACKS* and ACE_HAS* macros for autoconfig.

USER VISIBLE CHANGES BETWEEN ACE-5.4.8 and ACE-5.4.9
====================================================

. Added dozens of new ACE_LACKS and ACE_HAS defines which are used to
  simplify the ACE_OS layer

. Constructors of ACE_Time_Value have been made explicit to prevent
  implicit conversions.

. Added a shutdown() method to ACE_Barrier. The new method aborts the
  wait by all threads.

. Changed the behavior of ACE_Message_Queue::enqueue_head() and
  enqueue_tail(). If the enqueued message block has other blocks
  chained to it via its next() pointer, the entire chain of blocks
  will be enqueued at once.

. Improved the support for high-resolution timers with
  ACE_Timer_Queue_Adapter.

. Make it possible to disable file caching in JAWS.

. Improved ACE_Pipe implementation so that it uses localhost to avoid
  firewall problems.

. Added Unicode support to the Service Configurator.

USER VISIBLE CHANGES BETWEEN ACE-5.4.7 and ACE-5.4.8
====================================================

. Improved IPv6 support

. Improved 64bit portability

. TTY_IO overhaul
  - Improved documentation.
  - It is now possible to request infinite timeout in portable manner.
    This can be achieved by setting negative value to readtimeoutmsec.
  - Various bugs fixed and portability issues resolved.

. Subset ACE for TAO and TAO Services

. Support for Intel C++ 9.0 on Windows and Linux

. Support for Microsoft Visual Studio 2005 (aka VC8) for Win32 as well
  as the Windows CE platforms Pocket PC 2003 and Windows Mobile 5.
  Solution/project files are generated with an appended "_vc8" for
  Win32 and "_WinCE" for the CE platforms. See
  ACE_wrappers/docs/CE-status.txt for more information.

. Completed implementation of ACE_Dev_Poll_Reactor using the Linux epoll
  facility; tested on Red Hat Enterprise Linux 4.

. The in-memory size of an ACE_RB_Tree will be smaller due to rearranged
  placement of pointers.

. Added an optimization to CDR stream to ignores alignment when marshaling
  data.  Use this new ACE_LACKS_CDR_ALIGNMENT compile-time option only
  when the ACE_DISABLE_SWAP_ON_READ macro is enabled.  This new option
  requires ACE CDR engine to do both marshaling and demarshaling, and
  when this option is enabled the encoded streams are no longer
  compliant with the CORBA CDR specification.

. Developed Feature Oriented Customizer (FOCUS) tool to enable
  specialization of middleware frameworks such as Reactor and Protocol
  framework.  FOCUS provides an XML based transformation engine, where
  the transformations to specialize the components are captured in XML
  file and a weaver specializes the code.

. Added support for unrolling ACE_OS::memcpy copy loop where
  applicable to improve performance. Autoconf tests empirically
  determine whether loop unrolling is at least 10% better than default
  version.

. Added support for an ACE "versioned" namespace.  When enabled, ACE
  library sources will be placed within a namespace of the user's
  choice or a namespace of the form ACE_5_4_7 by default, where
  "5_4_7" is the ACE major, minor and beta versions.  The default may
  be overridden by defining the ACE_VERSIONED_NAMESPACE_NAME
  preprocessor symbol.  Enable overall versioned namespace support by
  adding "versioned_namespace=1" to your MPC default.features file.

USER VISIBLE CHANGES BETWEEN ACE-5.4.6 and ACE-5.4.7
====================================================

. Support for shared libraries with VxWorks

. Support for Solaris 10 on x86 with Sun Studio 10 (C++ 5.7).

. Extended ACE_OS::event_xxx implementation to support platforms
  having either PThread support with Process Shared condition
  variables or POSIX semaphores with named (process shared)
  semaphore support or using the new FIFO based semaphores.

. ACE_OS::closesocket() no longer calls ACE_OS::shutdown() on any platform
  while closing the socket. It previously called ACE_OS::shutdown() on
  HP-UX. Removing this call fixes the fork-and-close programming paradigm
  that's common to many networked applications.

. RMCast
   - Support for message fragmentation. This will allow
     for messages larger than 64K.
   - Support for flow control.
   - Timed recv() in RMCast::Socket.
   - Per-instance configurable protocol parameters (e.g., message
     retention time, NAK timeout, etc).

USER VISIBLE CHANGES BETWEEN ACE-5.4.5 and ACE-5.4.6
====================================================

. Updated RMCast to include
   - Reactor-compatible interface.
   - Message unavailability reporting.
   - Protocol documentation.

. Added support for 64bit Visual Age on AIX

. Improved g++ 4.0 support.  A number of RTTI related problems have been
  fixed.

. Smaller footprint.

. Fixed memory leaks ACE_DLL and ACE_Log_Msg classes.

. The ACE::ICMP_Socket and ACE::Ping_Socket classes were moved out of
  the ACE namespace and "flattened" to ACE_ICMP_Socket and
  ACE_Ping_Socket to be consistent with the rest of ACE.

. ACE_INET_Addr::set_address() - fixed a possible struct member
  alignment issue when building an IPv4-mapped IPv6 address.

. Added a new ACE::wild_match() function to match a string based on
  wildcards.

. Added efficient overloads for string concatenation to the
  ACE_String_Base class.

. Added support for the use of pthread_getschedparam on MacOS X.

. Fixed an issue with static initialization of TSS related classes on
  static builds for Windows.

USER VISIBLE CHANGES BETWEEN ACE-5.4.4 and ACE-5.4.5
====================================================

. Remove special handling in the Thread Specific Storage(TSS) code
  that released the TSS key for ACE_TSS<TYPE>.  ACE_TSS<TYPE> has
  been changed to explicitly free the TSS key when necessary.

. On Win32 systems: detect thread termination via a hook in DLLMain
  for ACE.dll.  This allows cleanup of TSS objects for non-ACE threads
  that use ACE functions.  The most common case was threads that used
  ACE logging.  Formerly any TSS objects created by these threads would
  be leaked.

. Added support for GNU G++ 4.0.  The x.4.5 beta takes advantage of
  g++ 4.0's symbol visibility.  This feature is conceptually similar
  to MS Windows "__declspec(dllexport)" DLL functionality.  Using this
  new g++ feature results in substantially improved ACE/TAO/CIAO
  shared library binaries.  A subset of the improvements include the
  following:

      * The number of unnecessarily exported DSO/DLL symbols is
        greatly reduced, resulting in faster program start times.
      * Smaller footprint.
      * Improved performance since run-time indirection of internal
        symbols is no longer needed.

  No changes to the ACE/TAO sources were necessary to support this
  feature since the required visibility attributes were hidden behind
  the various "*_Export" macros (formerly only useful for MS Windows
  DLLs) used throughout ACE/TAO.

. The ACE_Reactor destructor will now call close() on the referenced reactor
  implementation. This assures that all handlers are notified before the
  ACE_Reactor object that's most likely referenced in these handlers is
  invalid. Although this should not be a user-visible change, it did catch
  some ACE tests off guard destroying reactor implementations and ACE_Reactor
  interfaces in the wrong order, so it may come up in the field as well.
  When using dynamically allocated reactor implementations, do not destroy
  the implementation object before the ACE_Reactor interface object. Use of
  the ACE_Reactor constructor's delete_implementation argument (with a value
  of 1) is recommended when dynamically allocating reactor implementations.

. Improved performance of HTBP by not requiring a lookup of peer hostname.

. Added new ACE_SizeCDR stream which allows one to calculate size of the
  representation without writing anything.

. Number of improvements in RMCast, reliable multicast implementation.

USER VISIBLE CHANGES BETWEEN ACE-5.4.3 and ACE-5.4.4
====================================================

. The ace-config script has been replaced by pkg-config metadata files
  which are installed in ${prefix}/lib/pkgconfig by the automake build.

. Remove ACE_OS::gets() implementation.  While this ACE implementation
  of gets() did not contain the security holes that all standard
  gets() implementations have, keeping it around only serves to foster
  confusion since (1) some may incorrectly assume that this
  ACE-specific gets() implementation has the same holes as standard
  ones, and (2) invoking it with a default size argument so that it
  looks like a standard gets() call results in behavior that is
  different from the standard.  Use ACE_OS::fgets() instead.

. Removed ACE_Unbounded_Set_Ex, this gave the false idea that it had
  thread safe iterators. Use ACE_Unbounded_Set instead

. Improved VxWorks support for static libraries. Shared libraries do cause
  several known problems which will be fixed in the x.4.5 release.

. Removed the usage of the ACE_x_cast macros, we are using the C++ casts
  from now on. The ACE_x_cast macros are deprecated and will be removed
  after the x.5.1 release

. Some improvements in autoconf support; better detection of available
  OS and compiler features.

. Fixed bugs in ACE TSS emulation

USER VISIBLE CHANGES BETWEEN ACE-5.4.2 and ACE-5.4.3
====================================================

. Improved Cygwin 1.5.12 support, 90% of the tests now succeed

. Improved OpenVMS support.

. Added ability to use fltk with Cygwin/MinGW

. Added ACE_INT64 that defines a native 64 bit type.

. Added 'q' as usable specifier for ACE_Log_Msg to print out int64 bit number.

. Added better support for Intel C++ compilers.

. Improved HPUX support.

. Added a new directory ("ACE_wrappers/protocols/ace") for new protocols
  that are not directly components of ACE, but are relate to ACE and
  defined a new protocol, HTBP (Hypertext Tunneling, Bidirectional
  Protocol) providing ACE_Acceptor/Connector/Stream semantics over a
  connection owned by an HTTP proxy. Test cases in
  ACE_wrappers/tests/HTBP provide examples of use.

. Performace enhancement in TP_Reactor's handle_timer_events method [Bug
  1971].

. Various changes to permit ACE to execute on HP NonStop platform (e.g
  support for its pthreads version).

. Updated HP NonStop configuration files (config-tandem-nsk).

. The "ACE" pseudo-namespace is now a true C++ namespace.  Transitional
  pseudo-namespaces that were only meant to be used internally by ACE,
  such as "ACE_Sock_Connect", no longer exist.

. ACE_CDR::Boolean type is now a true C++ "bool" on all platforms except
  MSVC++ 6.  We plan to deprecate MSVC++ 6 support sometime after the
  x.5 release of ACE+TAO+CIAO, so we recommend you start migrating to a
  later version of MSVC++.

. More GNU g++ 3.4.x fixes.

. Added ICMP and "ping" socket support.

. Added mkstemp() emulation.

. Fixed problem on Linux < 2.5.47 platforms where equality comparison of
  two logically equal sockaddr_in structure instances would incorrectly
  fail.

. Support for wide characters has been improved on non-Windows
  platforms.

. A number of Windows CE problems have been fixed.

. ACE's loading of DLLs (for example, as a result of loading synamic
  services) has been changed to use the native OS's facilities for
  locating the DLL instead of searching LD_LIBRARY_PATH (or its
  equivalent) then loading the DLL using a full pathname. This restores
  enforcement of a platform's loading and security policy.  To use the
  old DLL locating method, add ACE_MUST_HELP_DLOPEN_SEARCH_PATH to your
  config.h file before building ACE.

. A number of errors in the APG example programs have been corrected.

. Select_Reactor and Priority_Reactor performance improved. [Bug 1890]

. Wide-char functionality on POSIX (Linux, etc.)

. TSS memory leak fixes [Bug 1542]

. Ported to HPUX 11i v2 on Itanium

. Added code to ACE for platform RedHat AS 3.0 on Opteron.

. Changed ACE::crc32() family of functions to NOT fold in the length of
  the string/buffer/iovec into the CRC.


USER VISIBLE CHANGES BETWEEN ACE-5.4.1 and ACE-5.4.2
====================================================

. Support for g++ 3.4.1.

. All ACE Makefiles, project files, etc, are now generated by OCI's
  "MakeProjectCreator" (MPC) tool.  Makefiles and project files for
  commonly used configurations have been pre-generated and distributed
  with the beta(s).  Please see:

  $ACE_ROOT/ACE-INSTALL.html

  for information on how to use MPC with ACE.

. Improved Doxygen documentation.

. Reduced header file dependencies, which should speedup compilation
  and help minimize static footprint.

. ACE now requires support for the following standard C++ features:

  - "bool" keyword

  - "mutable" keyword

  - "explicit" keyword

  - C++ casts (e.g. static_cast<>, reinterpret_cast<>, dynamic_cast<>
    and const_cast<>)

  If you're using a compiler that does NOT support these features
  please contact Steve Huston <shuston@riverace.com> for support.

. Changed the select()-based reactor implementations to scan for
  broken handles to remove based on the registered handles, not on
  event handlers.  This allows for bad handles to be removed from the
  reactor even if the event handler doesn't implement get_handle() the
  way we expect.

. Support for Pthreads native recursive mutexes was added. This
  capability is specified to ACE_OS::mutex_init() as an optional
  argument, lock_type. To fix confusion from an earlier attempt to add
  this functionality, the meaning of the old 'type' argument to
  ACE_OS::thread_mutex_init() is changed. It previously combined the
  scope and type. Now it is just the type (e.g. recursive), as the
  scope is inherent in the method used. For clarification on
  ACE_HAS_RECURSIVE_MUTEXES, it means that the platform is capable of
  them, not that they always are, as one would expect. However, before
  Pthreads had recursion added, it was never optional. Now it is.

. Initial support for new Linux sys_epoll() interface in
  Dev_Poll_Reactor.  The obsolete Linux /dev/epoll interface is no
  longer supported.

. Improved Cygwin support.
  - Threading works without problems.
  - Problems with shared memory, process shared mutexes, multicast and
    some other small things still exist.

. New OpenVMS port.
  -  This is for the latest version of OpenVMS with all available ECOs
     applied. Basic stuff works without problems.  Advanced features
     still need some work.

. Usage of ASYS_INLINE is deprecated in ACE.  Use ACE_INLINE instead.

. All inline source files now end in ".inl".  The previous ".i"
  extension is generally used for preprocessed C sources.

. Autoconf support has been improved and fixed on a number of
  platforms, including the BSD variants (e.g. FreeBSD).  It is still
  not the preferred way to configure most platforms, but it is ready
  for wider testing. Please report any problems found to
  ace-bugs@cs.wustl.edu.

. A number of fixes were made to quiet compile errors and warnings on
  64-bit Windows.

. For builds on AIX using Visual Age C++, the make rtti option default
  was changed to 1, enabling RTTI by default.

. ACE_Service_Repository::remove() has a new, optional argument that
  can receive the service record pointer for the removed service. If
  the pointer is returned to the caller, it is not deleted. If the
  pointer is not returned to the caller (the default) it is deleted
  (this is the historic behavior).

. The tutorials in ACE_wrappers/docs have been removed. They were not
  being maintained and caused confusion in a number of cases. Now that
  there are complete examples that match the printed books (C++NPv1,
  C++NPv2, APG), the older tutorials are no longer useful.  Please see

  $ACE_ROOT/examples/C++NPv1/
  $ACE_ROOT/examples/C++NPv2/
  $ACE_ROOT/examples/APG/

  for the source code of the examples in those books.

. ACE_String_Base::fast_clear() is a new method which sets the string
  length to 0. Doesn't release string-allocated memory, but if the
  memory was externally supplied, it is no longer referenced from the
  string object.

. A true C++ "bool" is now used as the CDR stream boolean type, if
  supported by the compiler.

. Renamed AIX 5L configuration header from config-aix5.1.h to
  config-aix-5.x.h.

. All C++ equality, relational and logical operators now return bool
  instead of int, as is the norm for modern C++.

. Added new ACE_OS::realpath() implementation.  Contributed by Olli
  Savia  <ops at iki dot fi>


USER VISIBLE CHANGES BETWEEN ACE-5.4 and ACE-5.4.1
====================================================

ACE
---

. Fixed "make install" support in ACE+autoconf configurations.

. Fixed autoconf support on Solaris.

. Corrected invalid `aux' directory (on MS Windows) found in ACE
  distribution.

. ACE/TAO build now without problems with MinGW and all ACE tests run
  now without problems

. Added some more support for the new CBuilderX Preview compiler, this
  is not 100% ready yet because the compiler is still a preview and
  has its own problems.

. Added Visual SlickEdit 8.1 MPC template

. Added workaround for compile problems in Borland Release builds

. Cygwin 1.5.9 is now supported

. Tests for IPV6 have been added

. Implement lstat() so that it'll use stat() on platforms that don't
  support lstat().

. Problems related to ACE_Event_Handler usage in WFMO_Reactor was
  fixed.

. A wrapper for rmdir () has been added.

. Threads spawned in thread-per-connection mode never inherited the
  priority. This problem was fixed and this fix is consistent with the
  C++ NPV* books.

. Fixed memory leaks with ACE_String_Base::resize ()

. Enable the usage of native recursive mutexes for the implementation
  of ACE recursive mutexes on Linux.

. The ACE Proactor framework can now be enabled for AIX 5.2. Since AIO
  functionality is not run-time enabled by default on AIX 5.2, the ACE
  Proactor code is not built by default on AIX. To enable it, the
  config.h file must contain #define ACE_HAS_AIO_CALLS before
  including the config-aix-5.1.h file.

. The ACE_POSIX_CB_Proactor implementation is now built on all
  platforms except LynxOS.


USER VISIBLE CHANGES BETWEEN ACE-5.3.6 and ACE-5.4
==================================================

ACE:
---
. Added a new makefile commandline flag, static_link, that can be
  used to force static linking when static_libs_only is turned on. It
  uses the new STATIC_LINK_FLAG variable and is currently only
  implemented for for GNU ld, i.e., it adds the "-static" option to
  LDFLAGS. It's turned off by default since using it causes the
  footprint to go up by almost 1 MB on Linux, since it links all the
  system and compiler .a files, but can be turned on if users
  want/need to use it, by enabling both static_libs_only and static_link.


. Added macros ACE_USES_GPROF which enables users to use gprof in a
  multithreaded environment with ACE libs.

. Added a new functor template class, ACE_Malloc_Lock_Adapter_T,
  that's used by ACE_Malloc_T as a factory for the ACE_LOCK template
  parameter, and allows the use of locking strategy classes, like
  ACE_Process_Semaphore and ACE_Thread_Semaphore that don't have a
  satisfactory ctor taking a single required ACE_TCHAR* parameter, to
  be adapted to work with ACE_Malloc_T.

. The source code examples from "The ACE Programmer's Guide" book by
  Huston, Syyid, and Johnston, are now located in
  $ACE_ROOT/examples/APG.

. Support for GNU autoconf is now in ACE. Please see ACE-INSTALL.html
  for details.

. Fixed problems that prevented ACE from being compiled on LynxOS
  4.0.0.

. Fixed compilation error which prevented ACE from being compiled when
  ACE_COMPILE_TIMEPROBES was set to 1.

. Preliminary support for Tandem NSK has been added.

. Lots of bug fixes with TLI and XPG5. Please see $ACE_ROOT/ChangeLog
  for details.

. Fixed ACE_OS::event_timedwait() and ACE_OS::event_wait() so that
  they use a while loop around the ACE_OS::cond_[timed]wait() calls to
  avoid problems with spurious wakeups, etc.

. ACE's wrapper around getipnodebyname() and getipnodebyaddr () has
  been made go through the IPv4-only case on ACE_WIN32. Since Windows
  IPv6 implementation doesn't offer support (at thistime) for
  getipnodebyname() the code has been changed to use the IPV4 part of
  the code.

. Install with Borland C++ of ACE library fixed

ACEXML:
-------

. Fixed memory leak in ACEXML parser.

. Fixed implementations of rewind() in all the CharStreams. They were
  broken previously.

. Fixed bugs in the parser associated with incorrect handling of PE
  References for keywords.