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thread_pool.c
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thread_pool.c
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#include "thread_pool.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <pthread.h>
#define THREAD_POOL_LOG(format, ...) do { \
fprintf(stderr, format, ##__VA_ARGS__); \
} while(0)
#define MAX_THREAD_NUM 64
#define MAX_TASK_NUM 1024
typedef struct task_node_s{
thread_func_t thread_func;
void *arg;
struct task_node_s *next;
}task_node_t;
typedef struct task_deque_s{
volatile int deque_len;
task_node_t *head;
pthread_mutex_t mutex;
}task_deque_t;
typedef struct task_sem_s{
pthread_mutex_t task_mutex;
int v;
pthread_cond_t task_cond;
}task_sem_t;
struct thread_pool_s{
int max_thread_num;
volatile int working_threads_num;
volatile int alive_threads_num;
volatile int keep_alive;
task_deque_t *task_deque;
pthread_mutex_t threads_num_mutex;
pthread_cond_t threads_all_idle_cond;
/*用于线程池调度*/
task_sem_t *task_sem;
pthread_t *thread_id_array;
};
static void deque_init(task_deque_t *self);
static void deque_push(task_deque_t *self,task_node_t *task_node);
static task_node_t* deque_pull(task_deque_t *self);
static void deque_clear(task_deque_t *self);
static void deque_destory(task_deque_t *self);
static void task_sem_init(task_sem_t *self);
static void task_sem_signal(task_sem_t *self);
static void task_sem_broadcast(task_sem_t *self);
static void task_sem_wait(task_sem_t *self);
static void task_sem_destory(task_sem_t *self);
void* thread_pool_thread_do(void *args);
/* ========================== semaphore ============================ */
static void task_sem_init(task_sem_t *self){
pthread_mutex_init(&self->task_mutex, NULL);
self->v = 0;
pthread_cond_init(&self->task_cond, NULL);
}
static void task_sem_destory(task_sem_t *self){
pthread_mutex_destroy(&self->task_mutex);
pthread_cond_destroy(&self->task_cond);
}
static void task_sem_broadcast(task_sem_t *self){
pthread_mutex_lock(&self->task_mutex);
self->v = 1;
pthread_cond_broadcast(&self->task_cond);
pthread_mutex_unlock(&self->task_mutex);
}
static void task_sem_wait(task_sem_t *self){
pthread_mutex_lock(&self->task_mutex);
while (self->v != 1){
pthread_cond_wait(&self->task_cond, &self->task_mutex);
}
self->v = 0;
pthread_mutex_unlock(&self->task_mutex);
}
static void task_sem_signal(task_sem_t *self){
pthread_mutex_lock(&self->task_mutex);
self->v = 1;
pthread_cond_signal(&self->task_cond);
pthread_mutex_unlock(&self->task_mutex);
}
/* ========================== deque ============================ */
static void deque_init(task_deque_t *self){
self->deque_len = 0;
self->head = NULL;
pthread_mutex_init(&self->mutex, NULL);
}
/*外部需要加锁*/
static void deque_push(task_deque_t *self,task_node_t *task_node){
task_node_t *tmp;
tmp = self->head;
if (tmp == NULL){
self->head = task_node;
}else{
while(tmp->next != NULL){
tmp = tmp->next;
}
tmp->next = task_node;
}
self->deque_len++;
}
/*外部需要加锁*/
static task_node_t* deque_pull(task_deque_t *self){
task_node_t *task_node = self->head;
if (self->deque_len == 0){
}else{
self->head = self->head->next;
self->deque_len--;
}
return task_node;
}
static void deque_clear(task_deque_t *self){
while(self->deque_len){
free(deque_pull(self));
}
self->deque_len = 0;
self->head = NULL;
}
static void deque_destory(task_deque_t *self){
deque_clear(self);
pthread_mutex_destroy(&self->mutex);
}
/* ========================== thread_pool ============================ */
void* thread_pool_thread_do(void *args){
thread_pool_t *self = (thread_pool_t*)args;
task_node_t *task = NULL;
pthread_mutex_lock(&self->threads_num_mutex);
self->alive_threads_num++;
pthread_mutex_unlock(&self->threads_num_mutex);
while(self->keep_alive){
task_sem_wait(self->task_sem);
if (self->keep_alive){
pthread_mutex_lock(&self->threads_num_mutex);
self->working_threads_num++;
pthread_mutex_unlock(&self->threads_num_mutex);
pthread_mutex_lock(&self->task_deque->mutex);
task = deque_pull(self->task_deque);
/*如果队列还有任务则唤醒一个线程*/
if (self->task_deque->deque_len > 0){
task_sem_signal(self->task_sem);
}
pthread_mutex_unlock(&self->task_deque->mutex);
if (task){
task->thread_func(task->arg);
free(task);
}
pthread_mutex_lock(&self->threads_num_mutex);
self->working_threads_num--;
if (self->working_threads_num == 0) {
pthread_cond_signal(&self->threads_all_idle_cond);
}
pthread_mutex_unlock(&self->threads_num_mutex);
}
}
pthread_mutex_lock(&self->threads_num_mutex);
self->alive_threads_num--;
pthread_mutex_unlock(&self->threads_num_mutex);
}
thread_pool_t* thread_pool_create(int max_thread_num){
int i, ret;
if (max_thread_num <= 0 || max_thread_num > MAX_THREAD_NUM){
return NULL;
}
thread_pool_t *self = (thread_pool_t*)malloc(sizeof(thread_pool_t));
self->working_threads_num = 0;
self->alive_threads_num = 0;
self->keep_alive = 1;
self->max_thread_num = max_thread_num;
self->thread_id_array = (pthread_t*)malloc(sizeof(pthread_t) *self->max_thread_num);
self->task_deque = (task_deque_t*)malloc(sizeof(task_deque_t));
deque_init(self->task_deque);
pthread_mutex_init(&self->threads_num_mutex, NULL);
pthread_cond_init(&self->threads_all_idle_cond, NULL);
self->task_sem = (task_sem_t*)malloc(sizeof(task_sem_t));
task_sem_init(self->task_sem);
for (i = 0; i < self->max_thread_num; i++){
ret = pthread_create(&self->thread_id_array[i], NULL, thread_pool_thread_do, self);
}
/*等待线程全部创建好*/
while(self->alive_threads_num != self->max_thread_num){
}
return self;
}
int thread_pool_destroy(thread_pool_t *self){
int i;
if (self->keep_alive == 0){
return -1;
}
self->keep_alive = 0;
/*等待所有线程退出*/
while(self->alive_threads_num){
task_sem_broadcast(self->task_sem);
usleep(100000);
}
free(self->thread_id_array);
pthread_mutex_destroy(&self->threads_num_mutex);
pthread_cond_destroy(&self->threads_all_idle_cond);
deque_destory(self->task_deque);
task_sem_destory(self->task_sem);
free(self->task_sem);
free(self->task_deque);
free(self);
self = NULL;
return 0;
}
int thread_pool_add_task(thread_pool_t *self, thread_func_t thread_func, void *arg){
task_node_t *task = NULL;
if (self->task_deque->deque_len > MAX_TASK_NUM){
return -1;
}
task = (task_node_t*)malloc(sizeof(task_node_t));
task->arg = arg;
task->thread_func = thread_func;
task->next = NULL;
/*将任务加入队列*/
pthread_mutex_lock (&self->task_deque->mutex);
deque_push(self->task_deque, task);
/*唤醒一个工作线程*/
task_sem_signal(self->task_sem);
pthread_mutex_unlock(&self->task_deque->mutex);
return 0;
}
void thread_pool_wait(thread_pool_t *self){
pthread_mutex_lock(&self->threads_num_mutex);
while(self->task_deque->deque_len || self->working_threads_num ){
pthread_cond_wait(&self->threads_all_idle_cond, &self->threads_num_mutex);
}
pthread_mutex_unlock(&self->threads_num_mutex);
}