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// $Id$
#include "JAWS/Concurrency.h"
#include "JAWS/IO_Handler.h"
#include "JAWS/Pipeline.h"
#include "JAWS/Pipeline_Tasks.h"
#include "JAWS/Policy.h"
#include "JAWS/Data_Block.h"
#include "JAWS/Waiter.h"
#include "JAWS/Reaper.h"
ACE_RCSID(JAWS, Concurrency, "$Id$")
JAWS_Concurrency_Base::JAWS_Concurrency_Base (void)
: ACE_Task<ACE_SYNCH> (new ACE_Thread_Manager),
mb_acquired_ (0),
mb_ (0),
reaper_ (new JAWS_Reaper (this))
{
}
JAWS_Concurrency_Base::~JAWS_Concurrency_Base (void)
{
delete this->thr_mgr_;
delete this->reaper_;
}
ACE_Message_Block *
JAWS_Concurrency_Base::singleton_mb (void)
{
if (this->mb_acquired_ == 0)
{
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, g, this->lock_, 0);
if (this->mb_acquired_ == 0)
{
int result;
ACE_Message_Block *mb = 0;
result = this->getq (mb);
this->mb_acquired_ = 1;
if (result == -1 || mb == 0)
return 0;
this->mb_ = mb;
}
}
return this->mb_;
}
int
JAWS_Concurrency_Base::put (ACE_Message_Block *mb, ACE_Time_Value *tv)
{
return this->putq (mb, tv);
}
int
JAWS_Concurrency_Base::svc (void)
{
JAWS_TRACE ("JAWS_Concurrency_Base::svc");
ACE_Message_Block *mb = 0; // The message queue element
JAWS_Data_Block *db = 0; // Contains the task list
mb = this->singleton_mb ();
// A NULL data block indicates that the thread should shut
// itself down
if (mb == 0)
{
JAWS_TRACE ("JAWS_Concurrency_Base::svc, empty message block");
return -1;
}
db = dynamic_cast<JAWS_Data_Block *> (mb);
this->svc_loop (db);
return 0;
}
int
JAWS_Concurrency_Base::svc_loop (JAWS_Data_Block *db)
{
JAWS_TRACE ("JAWS_Concurrency_Base::svc_loop");
// Thread specific message block and data block
ACE_DEBUG ((LM_DEBUG, "(%t) Creating DataBlock\n"));
JAWS_Data_Block *ts_db = new JAWS_Data_Block (*db);
if (ts_db == 0)
{
ACE_ERROR ((LM_ERROR, "%p\n", "JAWS_Concurrency_Base::svc_hook"));
return -1;
}
for (;;)
{
if (this->svc_hook (ts_db) != 0)
break;
ts_db->task (db->task ());
ts_db->policy (db->policy ());
ts_db->payload (0);
ts_db->io_handler (0);
ts_db->rd_ptr (ts_db->wr_ptr ());
ts_db->crunch ();
}
ACE_DEBUG ((LM_DEBUG, "(%t) Deleting DataBlock\n"));
delete ts_db; // ts_db->release ();
return 0;
}
int
JAWS_Concurrency_Base::svc_hook (JAWS_Data_Block *ts_db)
{
JAWS_TRACE ("JAWS_Concurrency_Base::svc_hook");
int result = 0;
JAWS_IO_Handler *handler = 0; // Keeps the state of the task
JAWS_Pipeline_Handler *task = 0; // The task itself
JAWS_Data_Block *mb = 0; // The task message block
task = ts_db->task ();
handler = 0;
// Get the waiter index
JAWS_Waiter *waiter = JAWS_Waiter_Singleton::instance ();
int waiter_index = waiter->index ();
mb = ts_db;
do
{
JAWS_TRACE ("JAWS_Concurrency_Base::svc_hook, looping");
// Use a NULL task to make the thread recycle now
if (task == 0)
{
JAWS_TRACE ("JAWS_Concurrency_Base::svc_hook, recycling");
if (handler)
handler->done ();
handler = 0;
JAWS_IO_Handler **ioh = waiter->find_by_index (waiter_index);
*ioh = 0;
break;
}
// the task should set the handler to the appropriate next step
result = task->put (mb);
if (result == 0 || result == -3)
handler = mb->io_handler ();
else handler = 0;
if (result == 1 || result == 2)
{
JAWS_TRACE ("JAWS_Concurrency_Base::svc_hook, waiting");
// need to wait for an asynchronous event
// We need a way to destroy all the handlers created by the
// Asynch_Acceptor. Figure this out later.
handler = waiter->wait_for_completion (waiter_index);
if (handler == 0)
{
JAWS_TRACE ("JAWS_Concurrency_Base::svc_hook, bad proactor");
// Proactor failed
result = -1;
break;
}
}
if (result < 0)
{
JAWS_TRACE ("JAWS_Concurrency_Base::svc_hook, negative result");
if (result == -1)
ACE_ERROR ((LM_ERROR, "%p\n", "JAWS_Concurrency_Base::svc_hook"));
if (handler)
handler->done ();
handler = 0;
if (result == -2)
{
JAWS_IO_Handler **ioh = waiter->find_by_index (waiter_index);
*ioh = 0;
result = 0;
}
break;
}
if (handler == 0)
break;
mb = handler->message_block ();
task = handler->task ();
result = 0;
}
while (result == 0);
return result;
}
int
JAWS_Concurrency_Base::activate_hook (void)
{
return 0;
}
JAWS_Dispatcher::JAWS_Dispatcher (void)
: policy_(0)
{
}
int
JAWS_Dispatcher::dispatch (ACE_Message_Block *mb)
{
return this->policy ()->concurrency ()->put (mb);
}
JAWS_Dispatch_Policy *
JAWS_Dispatcher::policy (void)
{
return this->policy_;
}
JAWS_Dispatch_Policy *
JAWS_Dispatcher::policy (JAWS_Dispatch_Policy *p)
{
this->policy_ = p;
return this->policy_;
}
int
JAWS_Thread_Pool_Task::make (long flags, int nthreads, int maxthreads)
{
this->flags_ = flags;
this->nthreads_ = nthreads;
this->maxthreads_ = maxthreads;
ACE_thread_t *thr_names = new ACE_thread_t[nthreads];
if (this->activate (flags | THR_SUSPENDED,
nthreads,
0, // force active
ACE_DEFAULT_THREAD_PRIORITY,
-1, // group id
0, // ACE_Task_Base
0, // thread handles
0, // stack
0, // stack size
thr_names) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "JAWS_Thread_Pool_Task::activate"),
-1);
for (int i = 0; i < nthreads; i++)
{
JAWS_Thread_ID thr_id(thr_names[i]);
JAWS_IO_Handler *dummy = 0;
JAWS_Waiter_Singleton::instance ()->insert (thr_id, dummy);
}
delete[] thr_names;
this->thr_mgr_->resume_all ();
if (this->reaper_->open () == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "JAWS_Reaper::open"),
-1);
return 0;
}
int
JAWS_Thread_Per_Task::make (long flags, int maxthreads)
{
this->flags_ = flags;
this->maxthreads_ = maxthreads;
return 0;
}
int
JAWS_Thread_Per_Task::put (ACE_Message_Block *mb, ACE_Time_Value *tv)
{
JAWS_TRACE ("JAWS_Thread_Per_Task::put");
this->putq (mb, tv);
return this->activate_hook ();
}
int
JAWS_Thread_Per_Task::svc_loop (JAWS_Data_Block *db)
{
return this->svc_hook (db);
}
int
JAWS_Thread_Per_Task::activate_hook (void)
{
const int force_active = 1;
const int nthreads = 1;
ACE_thread_t thr_name;
if (this->activate (this->flags_ | THR_SUSPENDED,
nthreads,
force_active,
ACE_DEFAULT_THREAD_PRIORITY,
-1, // group id
0, // ACE_Task_Base
0, // thread handle
0, // stack
0, // stack size
&thr_name) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "JAWS_Thread_Pool_Task::activate"),
-1);
JAWS_Thread_ID thr_id (thr_name);
JAWS_IO_Handler *dummy = 0;
// In the thread-per-request strategy, need to take care of the
// case when the waiter array is full. Think about that problem
// later.
JAWS_Waiter_Singleton::instance ()->insert (thr_id, dummy);
this->thr_mgr_->resume (thr_name);
if (this->reaper_->open () == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "JAWS_Reaper::open"),
-1);
return 0;
}
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