145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/****************************************************************************
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* sched/pthread/pthread_mutexinit.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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# ifdef PTHREAD_MUTEX_DEFAULT_PRIO_INHERIT
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uint8_t proto = PTHREAD_PRIO_INHERIT;
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# else
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uint8_t proto = PTHREAD_PRIO_NONE;
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# endif
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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 = INVALID_PROCESS_ID;
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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_set_protocol((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 ?
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_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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