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#include "task.h"
#include "bmem.h"
#include "threading.h"
#include "circlebuf.h"
struct os_task_queue {
pthread_t thread;
os_sem_t *sem;
long id;
bool waiting;
bool tasks_processed;
os_event_t *wait_event;
pthread_mutex_t mutex;
struct circlebuf tasks;
};
struct os_task_info {
os_task_t task;
void *param;
};
static THREAD_LOCAL bool exit_thread = false;
static THREAD_LOCAL long thread_id = 0;
static volatile long thread_id_counter = 1;
static void *tiny_tubular_task_thread(void *param);
os_task_queue_t *os_task_queue_create()
{
struct os_task_queue *tq = bzalloc(sizeof(*tq));
tq->id = os_atomic_inc_long(&thread_id_counter);
if (pthread_mutex_init(&tq->mutex, NULL) != 0)
goto fail1;
if (os_sem_init(&tq->sem, 0) != 0)
goto fail2;
if (os_event_init(&tq->wait_event, OS_EVENT_TYPE_AUTO) != 0)
goto fail3;
if (pthread_create(&tq->thread, NULL, tiny_tubular_task_thread, tq) !=
0)
goto fail4;
return tq;
fail4:
os_event_destroy(tq->wait_event);
fail3:
os_sem_destroy(tq->sem);
fail2:
pthread_mutex_destroy(&tq->mutex);
fail1:
bfree(tq);
return NULL;
}
bool os_task_queue_queue_task(os_task_queue_t *tq, os_task_t task, void *param)
{
struct os_task_info ti = {
task,
param,
};
if (!tq)
return false;
pthread_mutex_lock(&tq->mutex);
circlebuf_push_back(&tq->tasks, &ti, sizeof(ti));
pthread_mutex_unlock(&tq->mutex);
os_sem_post(tq->sem);
return true;
}
static void wait_for_thread(void *data)
{
os_task_queue_t *tq = data;
os_event_signal(tq->wait_event);
}
static void stop_thread(void *unused)
{
exit_thread = true;
UNUSED_PARAMETER(unused);
}
void os_task_queue_destroy(os_task_queue_t *tq)
{
if (!tq)
return;
os_task_queue_queue_task(tq, stop_thread, NULL);
pthread_join(tq->thread, NULL);
os_event_destroy(tq->wait_event);
os_sem_destroy(tq->sem);
pthread_mutex_destroy(&tq->mutex);
circlebuf_free(&tq->tasks);
bfree(tq);
}
bool os_task_queue_wait(os_task_queue_t *tq)
{
if (!tq)
return false;
struct os_task_info ti = {
wait_for_thread,
tq,
};
pthread_mutex_lock(&tq->mutex);
tq->waiting = true;
tq->tasks_processed = false;
circlebuf_push_back(&tq->tasks, &ti, sizeof(ti));
pthread_mutex_unlock(&tq->mutex);
os_sem_post(tq->sem);
os_event_wait(tq->wait_event);
pthread_mutex_lock(&tq->mutex);
bool tasks_processed = tq->tasks_processed;
pthread_mutex_unlock(&tq->mutex);
return tasks_processed;
}
bool os_task_queue_inside(os_task_queue_t *tq)
{
return tq->id == thread_id;
}
static void *tiny_tubular_task_thread(void *param)
{
struct os_task_queue *tq = param;
thread_id = tq->id;
os_set_thread_name(__FUNCTION__);
while (!exit_thread && os_sem_wait(tq->sem) == 0) {
struct os_task_info ti;
pthread_mutex_lock(&tq->mutex);
circlebuf_pop_front(&tq->tasks, &ti, sizeof(ti));
if (tq->tasks.size && ti.task == wait_for_thread) {
circlebuf_push_back(&tq->tasks, &ti, sizeof(ti));
circlebuf_pop_front(&tq->tasks, &ti, sizeof(ti));
}
if (tq->tasks.size && ti.task == stop_thread) {
circlebuf_push_back(&tq->tasks, &ti, sizeof(ti));
circlebuf_pop_front(&tq->tasks, &ti, sizeof(ti));
}
if (tq->waiting) {
if (ti.task == wait_for_thread) {
tq->waiting = false;
} else {
tq->tasks_processed = true;
}
}
pthread_mutex_unlock(&tq->mutex);
ti.task(ti.param);
}
return NULL;
}
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