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// $Id$
// ============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// Barrier_Test.cpp
//
// = DESCRIPTION
// This program illustrates how the ACE barrier synchronization
// mechanisms work.
//
// = AUTHOR
// Prashant Jain and Doug Schmidt
//
// ============================================================================
#include "ace/Synch.h"
#include "ace/Thread_Manager.h"
#include "ace/Service_Config.h"
#include "test_config.h"
#if defined (ACE_HAS_THREADS)
struct Tester_Args
// = TITLE
// These arguments are passed into each test thread.
{
Tester_Args (ACE_Barrier &tb, int i)
: tester_barrier_ (tb),
n_iterations_ (i) {}
ACE_Barrier &tester_barrier_;
// Reference to the tester barrier. This controls each miteration
// of the tester function running in every thread.
int n_iterations_;
// Number of iterations to run.
};
// Iterate <n_iterations> time printing off a message and "waiting"
// for all other threads to complete this iteration.
static void *
tester (Tester_Args *args)
{
ACE_NEW_THREAD;
#if defined (VXWORKS)
ACE_Thread_Control tc (ACE_Thread_Manager::instance ());
#endif /* VXWORKS */
for (int iterations = 1;
iterations <= args->n_iterations_;
iterations++)
{
ACE_DEBUG ((LM_DEBUG, "(%t) in iteration %d\n", iterations));
// Block until all other threads have waited, then continue.
args->tester_barrier_.wait ();
}
return 0;
}
#endif /* ACE_HAS_THREADS */
int
main (int, char *[])
{
ACE_START_TEST ("Barrier_Test");
#if defined (ACE_HAS_THREADS)
int n_threads = ACE_MAX_THREADS;
int n_iterations = ACE_MAX_ITERATIONS;
ACE_Barrier tester_barrier (n_threads);
ACE_hthread_t *thread_handles;
ACE_NEW_RETURN (thread_handles, ACE_hthread_t[n_threads], -1);
Tester_Args args (tester_barrier, n_iterations);
for (int iteration_count = 0;
iteration_count < ACE_MAX_ITERATIONS;
iteration_count++)
{
ACE_DEBUG ((LM_DEBUG, "starting iteration %d\n",
iteration_count));
if (ACE_Thread_Manager::instance ()->spawn_n
((ACE_thread_t *) 0,
n_threads,
ACE_THR_FUNC (tester),
(void *) &args,
THR_NEW_LWP | THR_JOINABLE,
ACE_DEFAULT_THREAD_PRIORITY,
-1,
0,
0,
thread_handles) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "spawn_n"), 1);
#if defined (VXWORKS)
// VxWorks doesn't support thr_join() semantics... Someday
// we'll fix this.
ACE_Thread_Manager::instance ()->wait ();
#else
// Wait for all the threads to reach their exit point and then join
// with all the exiting threads.
for (int i = 0;
i < n_threads;
i++)
if (ACE_Thread::join (thread_handles[i]) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "join"), -1);
#endif /* VXWORKS */
}
ACE_DEBUG ((LM_DEBUG, "test done\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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