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//=============================================================================
/**
* @file Barrier_Test.cpp
*
* This program illustrates how the ACE barrier synchronization
* mechanisms work.
*
* @author Prashant Jain <pjain@cs.wustl.edu> and Doug Schmidt <d.schmidt@vanderbilt.edu>
*/
//=============================================================================
#include "test_config.h"
#include "ace/Barrier.h"
#include "ace/Thread_Manager.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 iteration
// 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 *
wait_tester (Tester_Args *args)
{
for (int iterations = 1;
iterations <= args->n_iterations_;
iterations++)
{
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("(%t) in iteration %d\n"),
iterations));
// Block until all other threads have waited, then continue.
if (args->tester_barrier_.wait () != 0)
ACE_ERROR ((LM_ERROR, ACE_TEXT ("(%t) %p\n"),
ACE_TEXT ("wait failed")));
}
return 0;
}
// Wait on the barrier, expecting it to be shut down before completing
// the wait.
static void *
shut_tester (Tester_Args *args)
{
if (args->tester_barrier_.wait () == 0)
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%t) wait succeeded, should have shut down\n")));
else if (errno != ESHUTDOWN)
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%t) wait failed, expecting ESHUTDOWN, %p\n"),
ACE_TEXT ("got")));
return 0;
}
#endif /* ACE_HAS_THREADS */
int
run_main (int, ACE_TCHAR *[])
{
ACE_START_TEST (ACE_TEXT ("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);
Tester_Args args (tester_barrier, n_iterations);
for (size_t iteration_count = 0;
iteration_count < ACE_MAX_ITERATIONS;
iteration_count++)
{
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("starting iteration %d\n"),
iteration_count));
if (ACE_Thread_Manager::instance ()->spawn_n
(n_threads,
(ACE_THR_FUNC) wait_tester,
(void *) &args,
THR_NEW_LWP | THR_JOINABLE) == -1)
ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"),
ACE_TEXT ("spawn_n")), 1);
ACE_Thread_Manager::instance ()->wait ();
}
// Now test ACE_Barrier shutdown. Set up a barrier for n_threads, and start
// n_threads - 1 threads to wait, then shut the barrier down.
ACE_Barrier shut_barrier (n_threads);
Tester_Args shut_args (shut_barrier, 1);
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("Starting shutdown test threads\n")));
if (ACE_Thread_Manager::instance ()->spawn_n
(n_threads - 1,
(ACE_THR_FUNC) shut_tester,
(void *) &shut_args,
THR_NEW_LWP | THR_JOINABLE) == -1)
ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"), ACE_TEXT ("spawn_n")), 1);
shut_barrier.shutdown ();
ACE_Thread_Manager::instance ()->wait ();
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("test done\n")));
#else
ACE_ERROR ((LM_INFO,
ACE_TEXT ("threads not supported on this platform\n")));
#endif /* ACE_HAS_THREADS */
ACE_END_TEST;
return 0;
}
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