posix/src/prwlockdestroy.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @brief Destroy a RWLock
0007  *  @ingroup POSIXAPI
0008  */
0009 /*
0010  *  COPYRIGHT (c) 1989-2007.
0011  *  On-Line Applications Research Corporation (OAR).
0012  *
0013  * Redistribution and use in source and binary forms, with or without
0014  * modification, are permitted provided that the following conditions
0015  * are met:
0016  * 1. Redistributions of source code must retain the above copyright
0017  *    notice, this list of conditions and the following disclaimer.
0018  * 2. Redistributions in binary form must reproduce the above copyright
0019  *    notice, this list of conditions and the following disclaimer in the
0020  *    documentation and/or other materials provided with the distribution.
0021  *
0022  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0023  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0025  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0026  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0027  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0028  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0029  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0030  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0031  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0032  * POSSIBILITY OF SUCH DAMAGE.
0033  */
0034
0035 #ifdef HAVE_CONFIG_H
0036 #include "config.h"
0037 #endif
0038
0039 #include <rtems/posix/rwlockimpl.h>
0040
0041 int pthread_rwlock_destroy(
0042   pthread_rwlock_t *_rwlock
0043 )
0044 {
0045   POSIX_RWLock_Control *the_rwlock;
0046   Thread_queue_Context  queue_context;
0047
0048   the_rwlock = _POSIX_RWLock_Get( _rwlock );
0049   POSIX_RWLOCK_VALIDATE_OBJECT( the_rwlock );
0050
0051   _CORE_RWLock_Acquire( &the_rwlock->RWLock, &queue_context );
0052
0053   /*
0054    *  If there is at least one thread waiting, then do not delete it.
0055    */
0056
0057   if ( !_Thread_queue_Is_empty( &the_rwlock->RWLock.Queue.Queue ) ) {
0058     _CORE_RWLock_Release( &the_rwlock->RWLock, &queue_context );
0059     return EBUSY;
0060   }
0061
0062   /*
0063    *  POSIX doesn't require behavior when it is locked.
0064    */
0065
0066   the_rwlock->flags = ~the_rwlock->flags;
0067   _CORE_RWLock_Release( &the_rwlock->RWLock, &queue_context );
0068   return 0;
0069 }