posix/src/mutexdestroy.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Initializing and Destroying a Mutex
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-2007.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <rtems/posix/muteximpl.h>
0042
0043 /*
0044  *  11.3.2 Initializing and Destroying a Mutex, P1003.1c/Draft 10, p. 87
0045  */
0046
0047 int pthread_mutex_destroy(
0048   pthread_mutex_t           *mutex
0049 )
0050 {
0051   POSIX_Mutex_Control  *the_mutex;
0052   unsigned long         flags;
0053   Thread_queue_Context  queue_context;
0054   int                   eno;
0055
0056   the_mutex = _POSIX_Mutex_Get( mutex );
0057   POSIX_MUTEX_VALIDATE_OBJECT( the_mutex, flags );
0058
0059   _POSIX_Mutex_Acquire( the_mutex, &queue_context );
0060
0061   if ( _POSIX_Mutex_Get_owner( the_mutex ) == NULL ) {
0062     the_mutex->flags = ~the_mutex->flags;
0063     eno = 0;
0064   } else {
0065     eno = EBUSY;
0066   }
0067
0068   _POSIX_Mutex_Release( the_mutex, &queue_context );
0069   return eno;
0070 }