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d7f02a8cb6
Since pthread_mutex is implemented by sem, it is impossible to see in ps who holds the lock and causes the wait. Replace sem with mutex implementation to solve the above problems Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>
116 lines
3.2 KiB
C
116 lines
3.2 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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* mutex - A reference to the mutex to be initialized
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* attr - Mutex attribute object to be used
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*
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* Returned Value:
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* 0 if successful. Otherwise, an error code.
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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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#ifdef CONFIG_PTHREAD_MUTEX_TYPES
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uint8_t type = PTHREAD_MUTEX_DEFAULT;
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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 flags = 0;
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#else
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uint8_t flags = _PTHREAD_MFLAGS_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=%p attr=%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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#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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flags = attr->robust == PTHREAD_MUTEX_ROBUST ?
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_PTHREAD_MFLAGS_ROBUST : 0;
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#endif
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}
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/* Initialize the mutex like a semaphore with initial count = 1 */
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status = mutex_init(&mutex->mutex);
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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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#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 = flags;
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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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#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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