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// $Id: task_one.cpp 91671 2010-09-08 18:39:23Z johnnyw $
// This test program illustrates how the ACE barrier synchronization
// mechanisms work in conjunction with the ACE_Task and the
// ACE_Thread_Manager. It is instructive to compare this with the
// test_barrier.cpp test to see how they differ.
#include "ace/OS_main.h"
#include "ace/Task.h"
#include "ace/Service_Config.h"
#if defined (ACE_HAS_THREADS)
#include "ace/Task.h"
#include "ace/Barrier.h"
class Barrier_Task : public ACE_Task<ACE_MT_SYNCH>
{
public:
Barrier_Task (ACE_Thread_Manager *thr_mgr,
int n_threads,
int n_iterations);
virtual int svc (void);
// Iterate <n_iterations> time printing off a message and "waiting"
// for all other threads to complete this iteration.
private:
ACE_Barrier 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.
};
Barrier_Task::Barrier_Task (ACE_Thread_Manager *thr_mgr,
int n_threads,
int n_iterations)
: ACE_Task<ACE_MT_SYNCH> (thr_mgr),
barrier_ (n_threads),
n_iterations_ (n_iterations)
{
// Create worker threads.
if (this->activate (THR_NEW_LWP, n_threads) == -1)
ACE_ERROR ((LM_ERROR, "%p\n", "activate failed"));
}
// Iterate <n_iterations> time printing off a message and "waiting"
// for all other threads to complete this iteration.
int
Barrier_Task::svc (void)
{
// Note that the ACE_Task::svc_run() method automatically adds us to
// the Thread_Manager when the thread begins.
for (int iterations = 1;
iterations <= this->n_iterations_;
iterations++)
{
ACE_DEBUG ((LM_DEBUG, "(%t) in iteration %d\n", iterations));
// Block until all other threads have waited, then continue.
this->barrier_.wait ();
}
// Note that the ACE_Task::svc_run() method automatically removes us
// from the Thread_Manager when the thread exits.
return 0;
}
// Default number of threads to spawn.
static const int DEFAULT_ITERATIONS = 5;
int
ACE_TMAIN (int argc, ACE_TCHAR *argv[])
{
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;
Barrier_Task barrier_task (ACE_Thread_Manager::instance (),
n_threads,
n_iterations);
// 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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