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https://github.com/apache/nuttx.git
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hujun5
5051721298
Move pthread mutex operations from kernel-space syscall interface to user-space implementations to reduce syscall overhead. Relocate mutex holder list tracking from task control block (tcb) to thread local storage (tls) to improve memory layout and cache efficiency. Add helper macros for conditional mutex implementations and update syscall interface accordingly. Signed-off-by: hujun5 <hujun5@xiaomi.com>
126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/****************************************************************************
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* sched/pthread/pthread_condwait.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 <unistd.h>
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#include <pthread.h>
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#include <sched.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/atomic.h>
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#include <nuttx/cancelpt.h>
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#include <nuttx/pthread.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: int pthread_cond_wait
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*
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* Description:
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* A thread can wait for a condition variable to be signalled or broadcast.
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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_cond_wait(FAR pthread_cond_t *cond, FAR pthread_mutex_t *mutex)
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{
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int status;
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int ret;
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sinfo("cond=%p mutex=%p\n", cond, mutex);
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/* pthread_cond_wait() is a cancellation point */
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enter_cancellation_point();
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/* Make sure that non-NULL references were provided. */
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if (cond == NULL || mutex == NULL)
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{
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ret = EINVAL;
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}
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/* Make sure that the caller holds the mutex */
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else if (!mutex_is_hold(&mutex->mutex))
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{
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ret = EPERM;
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}
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else
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{
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unsigned int nlocks;
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/* Give up the mutex */
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sinfo("Give up mutex / take cond\n");
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atomic_fetch_add(COND_WAIT_COUNT(cond), 1);
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ret = pthread_mutex_breaklock(mutex, &nlocks);
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status = -nxsem_wait_uninterruptible(&cond->sem);
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if (ret == OK)
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{
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/* Report the first failure that occurs */
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ret = status;
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}
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/* Reacquire the mutex.
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*
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* When cancellation points are enabled, we need to hold the mutex
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* when the pthread is canceled and cleanup handlers, if any, are
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* entered.
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*/
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sinfo("Reacquire mutex...\n");
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status = pthread_mutex_restorelock(mutex, nlocks);
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if (ret == OK)
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{
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/* Report the first failure that occurs */
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ret = status;
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}
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}
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leave_cancellation_point();
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sinfo("Returning %d\n", ret);
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return ret;
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}
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