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/**
* @file
*
* @ingroup POSIXAPI
*
* @brief Wait at a Barrier
*/
/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* Copyright (c) 2017 embedded brains GmbH
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/barrierimpl.h>
#include <rtems/posix/posixapi.h>
int pthread_barrier_wait( pthread_barrier_t *_barrier )
{
POSIX_Barrier_Control *barrier;
Thread_queue_Context queue_context;
Thread_Control *executing;
unsigned int waiting_threads;
POSIX_BARRIER_VALIDATE_OBJECT( _barrier );
barrier = _POSIX_Barrier_Get( _barrier );
executing = _POSIX_Barrier_Queue_acquire( barrier, &queue_context );
waiting_threads = barrier->waiting_threads;
++waiting_threads;
if ( waiting_threads == barrier->count ) {
barrier->waiting_threads = 0;
_Thread_queue_Flush_critical(
&barrier->Queue.Queue,
POSIX_BARRIER_TQ_OPERATIONS,
_Thread_queue_Flush_default_filter,
&queue_context
);
return PTHREAD_BARRIER_SERIAL_THREAD;
} else {
barrier->waiting_threads = waiting_threads;
_Thread_queue_Context_set_thread_state(
&queue_context,
STATES_WAITING_FOR_BARRIER
);
_Thread_queue_Context_set_enqueue_do_nothing_extra( &queue_context );
_Thread_queue_Enqueue(
&barrier->Queue.Queue,
POSIX_BARRIER_TQ_OPERATIONS,
executing,
&queue_context
);
return 0;
}
}
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