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// MacOS doesn't provide pthread_barrier
// magma_winthread.c doesn't provide pthread_barrier
#if (defined( _WIN32 ) || defined( _WIN64 ) || defined( __APPLE__ )) && ! defined( __MINGW32__ )
#include <errno.h>
#include "pthread_barrier.h"
// from http://stackoverflow.com/questions/3640853/performance-test-sem-t-v-s-dispatch-semaphore-t-and-pthread-once-t-v-s-dispat
// *sigh* OSX does not have pthread_barrier
int pthread_barrier_init( pthread_barrier_t *barrier,
const pthread_barrierattr_t *attr, unsigned int count )
{
if ( count == 0 ) {
errno = EINVAL;
return -1;
}
if ( pthread_mutex_init( &barrier->mutex, 0 ) < 0 ) {
return -1;
}
if ( pthread_cond_init( &barrier->cond, 0 ) < 0 ) {
pthread_mutex_destroy( &barrier->mutex );
return -1;
}
barrier->tripCount = count;
barrier->count = 0;
return 0;
}
int pthread_barrier_destroy( pthread_barrier_t *barrier )
{
pthread_cond_destroy( &barrier->cond );
pthread_mutex_destroy( &barrier->mutex );
return 0;
}
int pthread_barrier_wait( pthread_barrier_t *barrier )
{
pthread_mutex_lock( &barrier->mutex );
++(barrier->count);
if ( barrier->count >= barrier->tripCount ) {
barrier->count = 0;
pthread_cond_broadcast( &barrier->cond );
pthread_mutex_unlock( &barrier->mutex );
return PTHREAD_BARRIER_SERIAL_THREAD;
}
else {
pthread_cond_wait( &barrier->cond, &(barrier->mutex) );
pthread_mutex_unlock( &barrier->mutex );
return 0;
}
}
#endif // (_WIN32 || _WIN64 || __APPLE__) && ! __MINGW32__
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