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// $Id: barrier1.cpp 91671 2010-09-08 18:39:23Z johnnyw $
// This test program illustrates how the ACE barrier synchronization
// mechanisms work.
#include "ace/OS_main.h"
#include "ace/Barrier.h"
#include "ace/Thread_Manager.h"
#include "ace/Service_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)
{
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;
}
// Default number of threads to spawn.
static const int DEFAULT_ITERATIONS = 5;
int
ACE_TMAIN (int argc, ACE_TCHAR *argv[])
{
ACE_Service_Config daemon (argv[0]);
int n_threads = argc > 1 ? ACE_OS::atoi (argv[1]) : ACE_DEFAULT_THREADS;
int n_iterations = argc > 2 ? ACE_OS::atoi (argv[2]) : DEFAULT_ITERATIONS;
ACE_Barrier tester_barrier (n_threads);
Tester_Args args (tester_barrier, n_iterations);
if (ACE_Thread_Manager::instance ()->spawn_n
(int(n_threads), ACE_THR_FUNC (tester),
(void *) &args, THR_NEW_LWP | THR_DETACHED) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "spawn_n"), 1);
// Wait for all the threads to reach their exit point.
ACE_Thread_Manager::instance ()->wait ();
ACE_DEBUG ((LM_DEBUG, "(%t) done\n"));
return 0;
}
#else
int
ACE_TMAIN (int, ACE_TCHAR *[])
{
ACE_ERROR ((LM_ERROR, "threads not supported on this platform\n"));
return 0;
}
#endif /* ACE_HAS_THREADS */
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