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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>
141 lines
4.1 KiB
C
141 lines
4.1 KiB
C
/****************************************************************************
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* libs/libc/pthread/pthread_mutex_destroy.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 <signal.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 <debug.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/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_destroy
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*
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* Description:
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* Destroy 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_destroy(FAR pthread_mutex_t *mutex)
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{
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int ret = EINVAL;
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int status;
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sinfo("mutex=%p\n", mutex);
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DEBUGASSERT(mutex != NULL);
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if (mutex != NULL)
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{
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pid_t pid;
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pid = mutex_get_holder(&mutex->mutex);
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/* Is the mutex available? */
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if (pid >= 0)
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{
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/* < 0: available, >0 owned, ==0 error */
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DEBUGASSERT(pid != 0);
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/* No.. Verify that the PID still exists. We may be destroying
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* the mutex after cancelling a pthread and the mutex may have
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* been in a bad state owned by the dead pthread. NOTE: The
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* following behavior is unspecified for pthread_mutex_destroy()
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* (see pthread_mutex_consistent()).
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*
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* If the holding thread is still valid, then we should be able to
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* map its PID to the underlying TCB. That is what
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* nxsched_get_tcb() does.
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*/
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if (pthread_kill(pid, 0) != 0)
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{
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/* The thread associated with the PID no longer exists */
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/* Reset the semaphore. If threads are were on this
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* semaphore, then this will awakened them and make
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* destruction of the semaphore impossible here.
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*/
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mutex_reset(&mutex->mutex);
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/* Check if the reset caused some other thread to lock the
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* mutex.
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*/
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if (mutex_is_locked(&mutex->mutex))
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{
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/* Yes.. then we cannot destroy the mutex now. */
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ret = EBUSY;
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}
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/* Destroy the underlying semaphore */
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else
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{
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status = mutex_destroy(&mutex->mutex);
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ret = (status < 0) ? -status : OK;
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}
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}
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else
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{
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ret = EBUSY;
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}
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}
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else
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{
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/* Destroy the semaphore
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*
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* REVISIT: What if there are threads waiting on the semaphore?
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* Perhaps this logic should all nxsem_reset() first?
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*/
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status = mutex_destroy(&mutex->mutex);
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ret = ((status < 0) ? -status : OK);
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}
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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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