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hujun5
082a3d3085
This lock is currently used in three places, mainly to protect tls->tl_mhead. Among them, pthread_mutex_add and pthread_mutex_remove involve writing to tls->tl_mhead, and there is certainly no conflict within the same thread. As for pthread_mutex_inconsistent, it involves reading. Currently, it can only be called when the TCB task corresponding to this tls exits, and the TCB corresponding to the tls can no longer continue to run. It seems that adding the lock serves no real purpose. Signed-off-by: hujun5 <hujun5@xiaomi.com>
83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/****************************************************************************
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* libs/libc/pthread/pthread_mutex_inconsistent.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <pthread.h>
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#include <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/sched.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/pthread.h>
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#include <nuttx/atomic.h>
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#include "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_inconsistent
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*
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* Description:
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* This function is called when a pthread is terminated via either
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* pthread_exit() or pthread_cancel(). It will check for any mutexes
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* held by exiting thread. It will mark them as inconsistent and
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* then wake up the highest priority waiter for the mutex. That
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* instance of pthread_mutex_lock() will then return EOWNERDEAD.
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*
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* Input Parameters:
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* tcb -- a reference to the TCB of the exiting pthread.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void pthread_mutex_inconsistent(FAR struct tls_info_s *tls)
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{
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FAR struct pthread_mutex_s *mutex;
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/* Remove and process each mutex held by this task */
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while (tls->tl_mhead != NULL)
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{
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/* Remove the mutex from the TCB list */
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mutex = tls->tl_mhead;
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tls->tl_mhead = mutex->flink;
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mutex->flink = NULL;
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/* Mark the mutex as INCONSISTENT and wake up any waiting thread */
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mutex->flags |= _PTHREAD_MFLAGS_INCONSISTENT;
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mutex_reset(&mutex->mutex);
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}
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}
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