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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>
147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/****************************************************************************
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* sched/pthread/pthread_condclockwait.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 <nuttx/compiler.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <signal.h>
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#include <time.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/atomic.h>
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#include <nuttx/irq.h>
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#include <nuttx/wdog.h>
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#include <nuttx/signal.h>
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#include <nuttx/cancelpt.h>
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#include <nuttx/pthread.h>
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#include "sched/sched.h"
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#include "pthread/pthread.h"
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#include "clock/clock.h"
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#include "signal/signal.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_cond_clockwait
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*
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* Description:
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* A thread can perform a timed wait on a condition variable.
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*
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* Input Parameters:
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* cond - the condition variable to wait on
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* mutex - the mutex that protects the condition variable
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* clockid - The timing source to use in the conversion
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* abstime - wait until this absolute time
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*
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* Returned Value:
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* OK (0) on success; A non-zero errno value is returned on failure.
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*
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* Assumptions:
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* Timing is of resolution 1 msec, with +/-1 millisecond accuracy.
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*
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****************************************************************************/
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int pthread_cond_clockwait(FAR pthread_cond_t *cond,
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FAR pthread_mutex_t *mutex,
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clockid_t clockid,
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FAR const struct timespec *abstime)
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{
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int ret = OK;
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int status;
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sinfo("cond=%p mutex=%p abstime=%p\n", cond, mutex, abstime);
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/* pthread_cond_clockwait() 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 || !mutex)
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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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/* If no wait time is provided, this function degenerates to
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* the same behavior as pthread_cond_wait().
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*/
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else if (!abstime)
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{
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ret = pthread_cond_wait(cond, mutex);
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}
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else
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{
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unsigned int nlocks;
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sinfo("Give up mutex...\n");
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atomic_fetch_add(COND_WAIT_COUNT(cond), 1);
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/* Give up the mutex */
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ret = pthread_mutex_breaklock(mutex, &nlocks);
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if (ret == 0)
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{
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status = nxsem_clockwait_uninterruptible(&cond->sem,
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clockid, abstime);
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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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}
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/* Reacquire the mutex (retaining the ret). */
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sinfo("Re-locking...\n");
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status = pthread_mutex_restorelock(mutex, nlocks);
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if (ret == 0)
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{
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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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