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204 lines
6.6 KiB
204 lines
6.6 KiB
/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation, nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include<stdio.h>
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#include<stdlib.h>
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#include<sys/time.h>
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#include "loc_timer.h"
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#include<time.h>
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#include<errno.h>
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enum timer_state {
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READY = 100,
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WAITING,
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DONE,
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ABORT
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};
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typedef struct {
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loc_timer_callback callback_func;
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void *user_data;
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unsigned int time_msec;
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pthread_cond_t timer_cond;
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pthread_mutex_t timer_mutex;
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enum timer_state state;
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}timer_data;
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static void *timer_thread(void *thread_data)
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{
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int ret = -ETIMEDOUT;
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struct timespec ts;
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struct timeval tv;
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timer_data* t = (timer_data*)thread_data;
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LOC_LOGD("%s:%d]: Enter. Delay = %d\n", __func__, __LINE__, t->time_msec);
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gettimeofday(&tv, NULL);
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clock_gettime(CLOCK_REALTIME, &ts);
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if(t->time_msec >= 1000) {
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ts.tv_sec += t->time_msec/1000;
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t->time_msec = t->time_msec % 1000;
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}
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if(t->time_msec)
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ts.tv_nsec += t->time_msec * 1000000;
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if(ts.tv_nsec > 999999999) {
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LOC_LOGD("%s:%d]: Large nanosecs\n", __func__, __LINE__);
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ts.tv_sec += 1;
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ts.tv_nsec -= 1000000000;
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}
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LOC_LOGD("%s:%d]: ts.tv_sec:%d; ts.tv_nsec:%d\n"
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"\t Current time: %d sec; %d nsec",
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__func__, __LINE__, (int)ts.tv_sec, (int)ts.tv_nsec,
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(int)tv.tv_sec, (int)tv.tv_usec*1000);
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pthread_mutex_lock(&(t->timer_mutex));
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if (READY == t->state) {
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t->state = WAITING;
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ret = pthread_cond_timedwait(&t->timer_cond, &t->timer_mutex, &ts);
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t->state = DONE;
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}
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pthread_mutex_unlock(&(t->timer_mutex));
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switch (ret) {
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case ETIMEDOUT:
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LOC_LOGV("%s:%d]: loc_timer timed out", __func__, __LINE__);
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break;
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case 0:
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LOC_LOGV("%s:%d]: loc_timer stopped", __func__, __LINE__);
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break;
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case -ETIMEDOUT:
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LOC_LOGV("%s:%d]: loc_timer cancelled", __func__, __LINE__);
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break;
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default:
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LOC_LOGE("%s:%d]: Call to pthread timedwait failed; ret=%d\n",
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__func__, __LINE__, ret);
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break;
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}
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if(ETIMEDOUT == ret)
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t->callback_func(t->user_data, ret);
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// A (should be rare) race condition is that, when the loc_time_stop is called
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// and acquired mutex, we reach here. pthread_mutex_destroy will fail with
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// error code EBUSY. We give it 6 tries in 5 seconds. Should be eanough time
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// for loc_timer_stop to complete. With the 7th try, we also perform unlock
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// prior to destroy.
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{
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int i;
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for (i = 0; EBUSY == pthread_mutex_destroy(&t->timer_mutex) && i <= 5; i++) {
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if (i < 5) {
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sleep(1);
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} else {
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// nah, forget it, something is seriously wrong. Mutex has been
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// held too long. Unlock the mutext here.
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pthread_mutex_unlock(&t->timer_mutex);
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}
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}
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}
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pthread_cond_destroy(&t->timer_cond);
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free(t);
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LOC_LOGD("%s:%d]: Exit\n", __func__, __LINE__);
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return NULL;
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}
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void* loc_timer_start(unsigned int msec, loc_timer_callback cb_func,
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void* caller_data)
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{
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timer_data *t=NULL;
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pthread_attr_t tattr;
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pthread_t id;
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LOC_LOGD("%s:%d]: Enter\n", __func__, __LINE__);
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if(cb_func == NULL || msec == 0) {
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LOC_LOGE("%s:%d]: Error: Wrong parameters\n", __func__, __LINE__);
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goto _err;
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}
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t = (timer_data *)calloc(1, sizeof(timer_data));
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if(t == NULL) {
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LOC_LOGE("%s:%d]: Could not allocate memory. Failing.\n",
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__func__, __LINE__);
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goto _err;
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}
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if(pthread_cond_init(&(t->timer_cond), NULL)) {
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LOC_LOGE("%s:%d]: Pthread cond init failed\n", __func__, __LINE__);
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goto t_err;
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}
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if(pthread_mutex_init(&(t->timer_mutex), NULL)) {
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LOC_LOGE("%s:%d]: Pthread mutex init failed\n", __func__, __LINE__);
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goto cond_err;
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}
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t->callback_func = cb_func;
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t->user_data = caller_data;
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t->time_msec = msec;
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t->state = READY;
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if (pthread_attr_init(&tattr)) {
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LOC_LOGE("%s:%d]: Pthread mutex init failed\n", __func__, __LINE__);
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goto mutex_err;
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}
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pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED);
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if(pthread_create(&(id), &tattr, timer_thread, (void *)t)) {
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LOC_LOGE("%s:%d]: Could not create thread\n", __func__, __LINE__);
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goto attr_err;
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}
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LOC_LOGD("%s:%d]: Created thread with id: %d\n",
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__func__, __LINE__, (int)id);
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goto _err;
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attr_err:
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pthread_attr_destroy(&tattr);
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mutex_err:
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pthread_mutex_destroy(&t->timer_mutex);
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cond_err:
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pthread_cond_destroy(&t->timer_cond);
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t_err:
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free(t);
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t = NULL;
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_err:
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LOC_LOGD("%s:%d]: Exit\n", __func__, __LINE__);
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return t;
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}
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void loc_timer_stop(void* handle) {
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timer_data* t = (timer_data*)handle;
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if (NULL != t && (READY == t->state || WAITING == t->state) &&
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pthread_mutex_lock(&(t->timer_mutex)) == 0) {
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if (READY == t->state || WAITING == t->state) {
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pthread_cond_signal(&t->timer_cond);
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t->state = ABORT;
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}
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pthread_mutex_unlock(&(t->timer_mutex));
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}
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}
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