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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup POSIXAPI
*
* @brief Wait at a Barrier
*/
/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* Copyright (c) 2017 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#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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