posix/src/prwlockwrlock.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Obtain a Write Lock on a RWlock Instance
0009  */
0010
0011 /*
0012  *  POSIX RWLock Manager -- Obtain a Write Lock on a RWLock Instance
0013  *
0014  *  COPYRIGHT (c) 1989-2007.
0015  *  On-Line Applications Research Corporation (OAR).
0016  *
0017  * Redistribution and use in source and binary forms, with or without
0018  * modification, are permitted provided that the following conditions
0019  * are met:
0020  * 1. Redistributions of source code must retain the above copyright
0021  *    notice, this list of conditions and the following disclaimer.
0022  * 2. Redistributions in binary form must reproduce the above copyright
0023  *    notice, this list of conditions and the following disclaimer in the
0024  *    documentation and/or other materials provided with the distribution.
0025  *
0026  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0027  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0028  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0029  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0030  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0031  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0032  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0033  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0034  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0035  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0036  * POSSIBILITY OF SUCH DAMAGE.
0037  */
0038
0039 #ifdef HAVE_CONFIG_H
0040 #include "config.h"
0041 #endif
0042
0043 #include <rtems/posix/rwlockimpl.h>
0044 #include <rtems/posix/posixapi.h>
0045
0046 int pthread_rwlock_wrlock(
0047   pthread_rwlock_t  *rwlock
0048 )
0049 {
0050   POSIX_RWLock_Control *the_rwlock;
0051   Thread_queue_Context  queue_context;
0052   Status_Control        status;
0053
0054   the_rwlock = _POSIX_RWLock_Get( rwlock );
0055   POSIX_RWLOCK_VALIDATE_OBJECT( the_rwlock );
0056
0057   _Thread_queue_Context_initialize( &queue_context );
0058   _Thread_queue_Context_set_enqueue_do_nothing_extra( &queue_context );
0059   status = _CORE_RWLock_Seize_for_writing(
0060     &the_rwlock->RWLock,
0061     true,          /* do not timeout -- wait forever */
0062     &queue_context
0063   );
0064   return _POSIX_Get_error( status );
0065 }