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// $Id$
// ============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// Thread_Pool_Test.cpp
//
// = DESCRIPTION
// This test program illustrates how the ACE task synchronization
// mechanisms work in conjunction with the ACE_Task and the
// ACE_Thread_Manager. If the manual flag is not set input comes
// from stdin until the user enters a return only. This stops
// all workers via a message block of length 0. This is an
// alternative shutdown of workers compared to queue deactivate.
//
// = AUTHOR
// Karlheinz Dorn, Doug Schmidt, and Prashant Jain
//
// ============================================================================
#include "ace/Task.h"
#include "ace/Service_Config.h"
#include "ace/Task.h"
#include "test_config.h"
#if defined (ACE_HAS_THREADS)
// Number of iterations to run the test.
static size_t n_iterations = 100;
class Thread_Pool : public ACE_Task<ACE_MT_SYNCH>
{
public:
Thread_Pool (ACE_Thread_Manager *thr_mgr, int n_threads);
virtual int svc (void);
// Iterate <n_iterations> time printing off a message and "waiting"
// for all other threads to complete this iteration.
virtual int put (ACE_Message_Block *mb, ACE_Time_Value *tv = 0);
// This allows the producer to pass messages to the <Thread_Pool>.
private:
virtual int close (u_long);
// = Not needed for this test.
virtual int open (void *) { return 0; }
};
int
Thread_Pool::close (u_long)
{
ACE_DEBUG ((LM_DEBUG, "(%t) close of worker\n"));
return 0;
}
Thread_Pool::Thread_Pool (ACE_Thread_Manager *thr_mgr,
int n_threads)
: ACE_Task<ACE_MT_SYNCH> (thr_mgr)
{
// Create worker threads.
if (this->activate (THR_NEW_LWP, n_threads) == -1)
ACE_ERROR ((LM_ERROR, "%p\n", "activate failed"));
}
// Simply enqueue the Message_Block into the end of the queue.
int
Thread_Pool::put (ACE_Message_Block *mb, ACE_Time_Value *tv)
{
return this->putq (mb, tv);
}
// Iterate <n_iterations> time printing off a message and "waiting"
// for all other threads to complete this iteration.
int
Thread_Pool::svc (void)
{
ACE_NEW_THREAD;
// Note that the ACE_Task::svc_run () method automatically adds us to
// the Thread_Manager when the thread begins.
int count = 1;
// Keep looping, reading a message out of the queue, until we get a
// message with a length == 0, which signals us to quit.
for (;; count++)
{
ACE_Message_Block *mb;
ACE_ASSERT (this->getq (mb) != -1);
int length = mb->length ();
if (length > 0)
ACE_DEBUG ((LM_DEBUG,
"(%t) in iteration %d, length = %d, text = \"%*s\"\n",
count, length, length - 1, mb->rd_ptr ()));
// We're responsible for deallocating this.
delete mb;
if (length == 0)
{
ACE_DEBUG ((LM_DEBUG,
"(%t) in iteration %d, got NULL message, exiting\n",
count));
break;
}
}
// Note that the ACE_Task::svc_run () method automatically removes
// us from the Thread_Manager when the thread exits.
return 0;
}
static void
produce (Thread_Pool &thread_pool)
{
ACE_DEBUG ((LM_DEBUG, "(%t) producer start, dumping the Thread_Pool\n"));
thread_pool.dump ();
for (int n;;)
{
// Allocate a new message.
ACE_Message_Block *mb;
ACE_NEW (mb, ACE_Message_Block (BUFSIZ));
#if defined (manual)
ACE_DEBUG ((LM_DEBUG,
"(%t) press chars and enter to put a new message into task queue..."));
n = ACE_OS::read (ACE_STDIN, mb->rd_ptr (), mb->size ());
#else // Automatically generate messages.
static size_t count = 0;
ACE_OS::sprintf (mb->rd_ptr (), "%d\n", count);
n = ACE_OS::strlen (mb->rd_ptr ());
if (count == n_iterations)
n = 1; // Indicate that we need to shut down.
else
count++;
if (count == 0 || (count % 20 == 0))
ACE_OS::sleep (1);
#endif /* manual */
if (n > 1)
{
// Send a normal message to the waiting threads and continue
// producing.
mb->wr_ptr (n);
// Pass the message to the Thread_Pool.
if (thread_pool.put (mb) == -1)
ACE_ERROR ((LM_ERROR, " (%t) %p\n", "put"));
}
else
{
// Send a shutdown message to the waiting threads and exit.
ACE_DEBUG ((LM_DEBUG, "\n(%t) start loop, dump of task:\n"));
thread_pool.dump ();
for (int i = thread_pool.thr_count (); i > 0; i--)
{
ACE_DEBUG ((LM_DEBUG,
"(%t) EOF, enqueueing NULL block for thread = %d\n",
i));
// Enqueue a NULL message to flag each consumer to
// shutdown.
if (thread_pool.put (new ACE_Message_Block) == -1)
ACE_ERROR ((LM_ERROR, " (%t) %p\n", "put"));
}
ACE_DEBUG ((LM_DEBUG, "\n(%t) end loop, dump of task:\n"));
thread_pool.dump ();
break;
}
}
}
#endif /* ACE_HAS_THREADS */
int
main (int, char *[])
{
ACE_START_TEST ("Thread_Pool_Test");
#if defined (ACE_HAS_THREADS)
int n_threads = ACE_MAX_THREADS;
ACE_DEBUG ((LM_DEBUG, "(%t) threads = %d\n", n_threads));
// Create the worker tasks.
Thread_Pool thread_pool (ACE_Service_Config::thr_mgr (),
n_threads);
// Create work for the worker tasks to process in their own threads.
produce (thread_pool);
// Wait for all the threads to reach their exit point.
ACE_DEBUG ((LM_DEBUG, "(%t) waiting with thread manager...\n"));
ACE_Service_Config::thr_mgr ()->wait ();
ACE_DEBUG ((LM_DEBUG, "(%t) destroying worker tasks and exiting...\n"));
#else
ACE_ERROR ((LM_ERROR, "threads not supported on this platform\n"));
#endif /* ACE_HAS_THREADS */
ACE_END_TEST;
return 0;
}
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