posix/src/mutexgetprioceiling.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Returns the Current Priority Ceiling of the 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 #include <rtems/posix/priorityimpl.h>
0043
0044 /*
0045  *  13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131
0046  */
0047
0048 int pthread_mutex_getprioceiling(
0049 #ifdef HAVE_PTHREAD_MUTEX_GETCEILING_CONST
0050   const pthread_mutex_t *mutex,
0051 #else
0052   pthread_mutex_t       *mutex,
0053 #endif
0054   int                   *prioceiling
0055 )
0056 {
0057   POSIX_Mutex_Control  *the_mutex;
0058   unsigned long         flags;
0059   Thread_queue_Context  queue_context;
0060
0061   if ( prioceiling == NULL ) {
0062     return EINVAL;
0063   }
0064
0065   the_mutex = _POSIX_Mutex_Get( RTEMS_DECONST( pthread_mutex_t *, mutex ) );
0066   POSIX_MUTEX_VALIDATE_OBJECT( the_mutex, flags );
0067
0068   _POSIX_Mutex_Acquire( the_mutex, &queue_context );
0069
0070   if ( _POSIX_Mutex_Get_protocol( flags ) == POSIX_MUTEX_PRIORITY_CEILING ) {
0071     *prioceiling = _POSIX_Priority_From_core(
0072       _POSIX_Mutex_Get_scheduler( the_mutex ),
0073       _POSIX_Mutex_Get_priority( the_mutex )
0074     );
0075   } else {
0076     *prioceiling = 0;
0077   }
0078
0079   _POSIX_Mutex_Release( the_mutex, &queue_context );
0080   return 0;
0081 }