155 lines
4.5 KiB
C
155 lines
4.5 KiB
C
/****************************************************************************
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* sched/pthread/pthread_mutexinit.c
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*
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* Copyright (C) 2007-2009, 2011, 2016-2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <pthread.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/semaphore.h>
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#include "pthread/pthread.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_mutex_init
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*
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* Description:
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* Create a mutex
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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int pthread_mutex_init(FAR pthread_mutex_t *mutex,
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FAR const pthread_mutexattr_t *attr)
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{
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int pshared = 0;
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#ifdef CONFIG_PTHREAD_MUTEX_TYPES
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uint8_t type = PTHREAD_MUTEX_DEFAULT;
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#endif
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#ifdef CONFIG_PRIORITY_INHERITANCE
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uint8_t proto = PTHREAD_PRIO_INHERIT;
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#endif
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#ifndef CONFIG_PTHREAD_MUTEX_UNSAFE
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#ifdef CONFIG_PTHREAD_MUTEX_DEFAULT_UNSAFE
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uint8_t robust = PTHREAD_MUTEX_STALLED;
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#else
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uint8_t robust = PTHREAD_MUTEX_ROBUST;
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#endif
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#endif
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int ret = OK;
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int status;
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sinfo("mutex=0x%p attr=0x%p\n", mutex, attr);
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if (!mutex)
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{
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ret = EINVAL;
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}
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else
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{
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/* Were attributes specified? If so, use them */
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if (attr)
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{
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pshared = attr->pshared;
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#ifdef CONFIG_PRIORITY_INHERITANCE
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proto = attr->proto;
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#endif
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#ifdef CONFIG_PTHREAD_MUTEX_TYPES
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type = attr->type;
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#endif
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#ifdef CONFIG_PTHREAD_MUTEX_BOTH
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robust = attr->robust;
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#endif
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}
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/* Indicate that the semaphore is not held by any thread. */
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mutex->pid = -1;
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/* Initialize the mutex like a semaphore with initial count = 1 */
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status = nxsem_init((FAR sem_t *)&mutex->sem, pshared, 1);
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if (status < 0)
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{
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ret = -ret;
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}
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#ifdef CONFIG_PRIORITY_INHERITANCE
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/* Initialize the semaphore protocol */
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status = nxsem_setprotocol((FAR sem_t *)&mutex->sem, proto);
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if (status < 0)
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{
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ret = -status;
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}
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#endif
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#ifndef CONFIG_PTHREAD_MUTEX_UNSAFE
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/* Initial internal fields of the mutex */
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mutex->flink = NULL;
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mutex->flags = (robust == PTHREAD_MUTEX_ROBUST ? _PTHREAD_MFLAGS_ROBUST : 0);
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#endif
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#ifdef CONFIG_PTHREAD_MUTEX_TYPES
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/* Set up attributes unique to the mutex type */
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mutex->type = type;
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mutex->nlocks = 0;
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#endif
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}
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sinfo("Returning %d\n", ret);
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return ret;
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}
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