mirror of https://github.com/ARMmbed/mbed-os.git
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
/*
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* Copyright (c) 2019, Arm Limited and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "internal/equeue_platform.h"
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#if defined(EQUEUE_PLATFORM_POSIX)
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#include <errno.h>
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/*
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* Using global variable as a simulation of passing time. Use of sleep functions may cause problems with thread preempting, which can lead to bad timings.
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* This problem does not occur on targets.
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* This variable is only increased in equeue_sema_wait function and in functions that simulate pass of time.
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*/
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unsigned int equeue_global_time = 0;
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// Tick operations
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void equeue_tick_init(void) {}
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unsigned equeue_tick(void)
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{
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return equeue_global_time;
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}
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// Mutex operations
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int equeue_mutex_create(equeue_mutex_t *m)
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{
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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return pthread_mutex_init(m, &attr);
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}
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void equeue_mutex_destroy(equeue_mutex_t *m)
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{
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pthread_mutex_destroy(m);
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}
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void equeue_mutex_lock(equeue_mutex_t *m)
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{
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pthread_mutex_lock(m);
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}
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void equeue_mutex_unlock(equeue_mutex_t *m)
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{
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pthread_mutex_unlock(m);
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}
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// Semaphore operations
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int equeue_sema_create(equeue_sema_t *s)
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{
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int err = pthread_mutex_init(&s->mutex, 0);
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if (err) {
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return err;
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}
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err = pthread_cond_init(&s->cond, 0);
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if (err) {
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return err;
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}
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s->signal = false;
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return 0;
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}
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void equeue_sema_destroy(equeue_sema_t *s)
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{
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pthread_cond_destroy(&s->cond);
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pthread_mutex_destroy(&s->mutex);
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}
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void equeue_sema_signal(equeue_sema_t *s)
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{
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pthread_mutex_lock(&s->mutex);
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s->signal = true;
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pthread_cond_signal(&s->cond);
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pthread_mutex_unlock(&s->mutex);
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}
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bool equeue_sema_wait(equeue_sema_t *s, int ms)
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{
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pthread_mutex_lock(&s->mutex);
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if (!s->signal) {
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if (ms < 0) {
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pthread_cond_wait(&s->cond, &s->mutex);
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} else {
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for (int i = 0; i < ms; i++) {
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equeue_global_time++;
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}
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// If ms == 0 increase time so functions don't get stuck in infinite loops.
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if (ms == 0) {
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equeue_global_time++;
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}
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}
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}
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bool signal = s->signal;
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s->signal = false;
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pthread_mutex_unlock(&s->mutex);
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return signal;
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}
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#endif
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