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/**
* Multithreaded work queue.
* Copyright (c) 2012 Ronald Bennett Cemer
* This software is licensed under the BSD license.
* See the accompanying LICENSE.txt for details.
*/
#include "muse_server_private.h"
#define LL_ADD(item, list) { \
item->prev = NULL; \
item->next = list; \
list = item; \
}
#define LL_REMOVE(item, list) { \
if (item->prev) item->prev->next = item->next; \
if (item->next) item->next->prev = item->prev; \
if (list == item) list = item->next; \
item->prev = item->next = NULL; \
}
static void *_ms_workqueue_worker_function(void *ptr);
static void *_ms_workqueue_worker_function(void *ptr)
{
ms_workqueue_worker_t *worker = (ms_workqueue_worker_t *) ptr;
ms_workqueue_job_t *job;
muse_return_val_if_fail(worker, NULL);
while (1) {
pthread_mutex_lock(&worker->workqueue->jobs_mutex);
if (worker->terminate) {
LOGW("The value (%d) to be terminated is set", worker->terminate);
pthread_mutex_unlock(&worker->workqueue->jobs_mutex);
break;
}
while (!worker->workqueue->waiting_jobs)
pthread_cond_wait(&worker->workqueue->jobs_cond, &worker->workqueue->jobs_mutex);
job = worker->workqueue->waiting_jobs;
LL_REMOVE(job, worker->workqueue->waiting_jobs);
LOGD("remove job %p", job);
if (ms_is_server_ready() && !job->job_function(job)) {
pthread_mutex_unlock(&worker->workqueue->jobs_mutex);
LOGE("Error - Execute the workqueue job, Restart muse server...");
ms_respawn(SIGABRT);
break;
}
pthread_mutex_unlock(&worker->workqueue->jobs_mutex);
}
free(worker);
LOGW("thread exit...");
pthread_exit(NULL);
}
void ms_workqueue_init(ms_workqueue_t *workqueue)
{
ms_workqueue_worker_t *worker;
int idx;
pthread_attr_t attr;
LOGD("Enter");
muse_return_if_fail(workqueue);
pthread_mutex_init(&workqueue->jobs_mutex, NULL);
pthread_cond_init(&workqueue->jobs_cond, NULL);
muse_return_if_fail(pthread_attr_init(&attr) == 0);
if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
LOGE("Failed to set detach state");
goto out;
}
for (idx = 0; idx < MUSE_WORK_THREAD_NUM; idx++) {
worker = calloc(1, sizeof(ms_workqueue_worker_t));
muse_return_if_fail(worker);
worker->workqueue = workqueue;
if (pthread_create(&worker->thread, &attr, _ms_workqueue_worker_function, (void *)worker)) {
LOGE("Failed to start all worker threads");
free(worker);
goto out;
}
LL_ADD(worker, worker->workqueue->workers);
}
out:
muse_return_if_fail(pthread_attr_destroy(&attr) == 0);
LOGD("Leave");
}
void ms_workqueue_deinit(ms_workqueue_t *workqueue)
{
ms_workqueue_worker_t *worker = NULL;
LOGD("Enter");
muse_return_if_fail(workqueue);
/* Set all workers to terminate. */
for (worker = workqueue->workers; worker; worker = worker->next)
worker->terminate = 1;
pthread_mutex_lock(&workqueue->jobs_mutex);
workqueue->workers = NULL;
workqueue->waiting_jobs = NULL;
pthread_cond_broadcast(&workqueue->jobs_cond);
pthread_mutex_unlock(&workqueue->jobs_mutex);
pthread_mutex_destroy(&workqueue->jobs_mutex);
pthread_cond_destroy(&workqueue->jobs_cond);
free(workqueue);
LOGD("Leave");
}
void ms_workqueue_add_job(ms_workqueue_t *workqueue, ms_workqueue_job_t *job)
{
muse_return_if_fail(workqueue);
pthread_mutex_lock(&workqueue->jobs_mutex);
LL_ADD(job, workqueue->waiting_jobs);
LOGD("add job %p", job);
pthread_cond_signal(&workqueue->jobs_cond);
pthread_mutex_unlock(&workqueue->jobs_mutex);
}
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