/* SPDX-License-Identifier: BSD-2-Clause */

/**
 * @file
 *
 * @ingroup POSIXAPI
 *
 * @brief Returns the Current Priority Ceiling of the Mutex
 */

/*
 *  COPYRIGHT (c) 1989-2007.
 *  On-Line Applications Research Corporation (OAR).
 *
 * 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/muteximpl.h>
#include <rtems/posix/priorityimpl.h>

/*
 *  13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131
 */

int pthread_mutex_getprioceiling(
#ifdef HAVE_PTHREAD_MUTEX_GETCEILING_CONST
  const pthread_mutex_t *mutex,
#else
  pthread_mutex_t       *mutex,
#endif
  int                   *prioceiling
)
{
  POSIX_Mutex_Control  *the_mutex;
  unsigned long         flags;
  Thread_queue_Context  queue_context;

  if ( prioceiling == NULL ) {
    return EINVAL;
  }

  the_mutex = _POSIX_Mutex_Get( RTEMS_DECONST( pthread_mutex_t *, mutex ) );
  POSIX_MUTEX_VALIDATE_OBJECT( the_mutex, flags );

  _POSIX_Mutex_Acquire( the_mutex, &queue_context );

  if ( _POSIX_Mutex_Get_protocol( flags ) == POSIX_MUTEX_PRIORITY_CEILING ) {
    *prioceiling = _POSIX_Priority_From_core(
      _POSIX_Mutex_Get_scheduler( the_mutex ),
      _POSIX_Mutex_Get_priority( the_mutex )
    );
  } else {
    *prioceiling = 0;
  }

  _POSIX_Mutex_Release( the_mutex, &queue_context );
  return 0;
}