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#include <pthread.h>
#include <stdlib.h>
#include "tpool.h"
struct tpool_work {
thread_func_t func;
void *arg;
struct tpool_work *next;
};
typedef struct tpool_work tpool_work_t;
tpool_t *tpool;
static tpool_work_t *tpool_work_create(thread_func_t func, void *arg)
{
tpool_work_t *work;
if (func == NULL)
return NULL;
work = (tpool_work_t *)malloc(sizeof(*work));
work->func = func;
work->arg = arg;
work->next = NULL;
return work;
}
static void tpool_work_destroy(tpool_work_t *work)
{
if (work == NULL)
return;
free(work);
}
struct tpool {
tpool_work_t *work_first;
tpool_work_t *work_last;
pthread_mutex_t work_mutex;
pthread_cond_t work_cond;
pthread_cond_t working_cond;
size_t working_cnt;
size_t thread_cnt;
bool stop;
};
static tpool_work_t *tpool_pop(tpool_t *tp)
{
if (tp == NULL)
return NULL;
tpool_work_t *work = tp->work_first;
if (work == NULL)
return NULL;
tp->work_first = work->next;
if (work == tp->work_last)
tp->work_last = NULL;
return work;
}
static void *tpool_worker(void *arg)
{
tpool_t *tp = (tpool_t *)arg;
tpool_work_t *work;
for (;;) {
pthread_mutex_lock(&tp->work_mutex);
while (tp->work_first == NULL && !tp->stop)
pthread_cond_wait(&tp->work_cond, &tp->work_mutex);
if (tp->stop)
break;
work = tpool_pop(tp);
tp->working_cnt++;
pthread_mutex_unlock(&tp->work_mutex);
if (work != NULL) {
work->func(work->arg);
tpool_work_destroy(work);
}
pthread_mutex_lock(&tp->work_mutex);
tp->working_cnt--;
if (!tp->stop && tp->working_cnt == 0 && tp->work_first == NULL)
pthread_cond_signal(&tp->working_cond);
pthread_mutex_unlock(&tp->work_mutex);
}
tp->thread_cnt--;
pthread_cond_signal(&tp->working_cond);
pthread_mutex_unlock(&tp->work_mutex);
return NULL;
}
tpool_t *tpool_create(size_t num)
{
tpool_t *tp;
pthread_t thread;
if (num == 0)
num = 12;
tp = (tpool_t *)malloc(sizeof(*tp));
tp->thread_cnt = num;
tp->work_first = tp->work_last = NULL;
pthread_mutex_init(&tp->work_mutex, NULL);
pthread_cond_init(&tp->work_cond, NULL);
pthread_cond_init(&tp->working_cond, NULL);
for (int i = 0; i < num; i++) {
pthread_create(&thread, NULL, tpool_worker, tp);
pthread_detach(thread);
}
return tp;
}
void tpool_destroy(tpool_t *tp)
{
tpool_work_t *work, *next_work;
if (tp == NULL)
return;
pthread_mutex_lock(&tp->work_mutex);
work = tp->work_first;
while (work != NULL) {
next_work = work->next;
tpool_work_destroy(work);
work = next_work;
}
tp->stop = true;
pthread_cond_broadcast(&tp->work_cond);
pthread_mutex_unlock(&tp->work_mutex);
tpool_wait(tp);
pthread_mutex_destroy(&tp->work_mutex);
pthread_cond_destroy(&tp->work_cond);
pthread_cond_destroy(&tp->working_cond);
free(tp);
}
bool tpool_add_work(tpool_t *tp, thread_func_t func, void *arg)
{
tpool_work_t *work;
if (tp == NULL)
return false;
work = tpool_work_create(func, arg);
if (work == NULL)
return false;
pthread_mutex_lock(&tp->work_mutex);
if (!tp->work_first)
tp->work_first = tp->work_last = work;
else
tp->work_last = tp->work_last->next = work;
pthread_cond_broadcast(&tp->work_cond);
pthread_mutex_unlock(&tp->work_mutex);
return true;
}
void tpool_wait(tpool_t *tp)
{
if (tp == NULL)
return;
pthread_mutex_lock(&tp->work_mutex);
while ((!tp->stop && tp->working_cnt != 0) || (tp->stop && tp->thread_cnt != 0))
pthread_cond_wait(&tp->working_cond, &tp->work_mutex);
pthread_mutex_unlock(&tp->work_mutex);
}
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