代码如下：
// POSIX C lib的
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
void *thread_function(void *arg)
{
int i;
for ( i=0; i<20; i++)
{
printf("Thread says hi!\n");
sleep(1);
}
return NULL;
}
int main(void)
{
pthread_t mythread;
if ( pthread_create( &mythread, NULL, thread_function, NULL) )
{
printf("error creating thread.");
abort();
}
if ( pthread_join ( mythread, NULL ) )
{
printf("error joining thread.");
abort();
}
exit(0);
}
// ACE的
#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);
private:
ACE_Barrier barrier_;
int n_iterations_;
};
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 )
{
if (this->activate (THR_NEW_LWP, n_threads) == -1)
ACE_ERROR ((LM_ERROR, "%p\n", "activate failed"));
}
int Barrier_Task::svc (void)
{
for ( int iterations = 1;
iterations <= this->n_iterations_;
iterations++ )
{
ACE_DEBUG ((LM_DEBUG, "(%t) in iteration %d\n", iterations));
this->barrier_.wait ();
}
return 0;
}
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);
ACE_Thread_Manager::instance ()->wait ();
ACE_DEBUG ((LM_DEBUG, "(%t) done\n"));
return 0;
}
#else
int main (int, char *[])
{
ACE_ERROR ((LM_ERROR, "threads not supported on this platform\n"));
return 0;
}
#endif /* ACE_HAS_THREADS */
