threadpool.c
#include "threadpool.h"
struct threadpool* threadpool_init(int thread_num, int queue_max_num)
{
struct threadpool *pool = NULL;
do
{
pool = malloc(sizeof(struct threadpool));
if (NULL == pool)
{
printf("failed to malloc threadpool!\n");
break;
}
pool->thread_num = thread_num;
pool->queue_max_num = queue_max_num;
pool->queue_cur_num = 0;
pool->head = NULL;
pool->tail = NULL;
if (pthread_mutex_init(&(pool->mutex), NULL))
{
printf("failed to init mutex!\n");
break;
}
if (pthread_cond_init(&(pool->queue_empty), NULL))
{
printf("failed to init queue_empty!\n");
break;
}
if (pthread_cond_init(&(pool->queue_not_empty), NULL))
{
printf("failed to init queue_not_empty!\n");
break;
}
if (pthread_cond_init(&(pool->queue_not_full), NULL))
{
printf("failed to init queue_not_full!\n");
break;
}
pool->pthreads = malloc(sizeof(pthread_t) * thread_num);
if (NULL == pool->pthreads)
{
printf("failed to malloc pthreads!\n");
break;
}
pool->queue_close = 0;
pool->pool_close = 0;
int i;
for (i = 0; i < pool->thread_num; ++i)
{
pthread_create(&(pool->pthreads[i]), NULL, threadpool_function, (void *)pool);
}
return pool;
} while (0);
return NULL;
}
int threadpool_add_job(struct threadpool* pool, void* (*callback_function)(void *arg), void *arg)
{
assert(pool != NULL);
assert(callback_function != NULL);
assert(arg != NULL);
pthread_mutex_lock(&(pool->mutex));
while ((pool->queue_cur_num == pool->queue_max_num) && !(pool->queue_close || pool->pool_close))
{
pthread_cond_wait(&(pool->queue_not_full), &(pool->mutex)); //队列满的时候就等待
}
if (pool->queue_close || pool->pool_close) //队列关闭或者线程池关闭就退出
{
pthread_mutex_unlock(&(pool->mutex));
return -1;
}
struct job *pjob =(struct job*) malloc(sizeof(struct job));
if (NULL == pjob)
{
pthread_mutex_unlock(&(pool->mutex));
return -1;
}
pjob->callback_function = callback_function;
pjob->arg = arg;
pjob->next = NULL;
if (pool->head == NULL)
{
pool->head = pool->tail = pjob;
pthread_cond_broadcast(&(pool->queue_not_empty)); //队列空的时候，有任务来时就通知线程池中的线程：队列非空
}
else
{
pool->tail->next = pjob;
pool->tail = pjob;
}
pool->queue_cur_num++;
pthread_mutex_unlock(&(pool->mutex));
return 0;
}
void* threadpool_function(void* arg)
{
struct threadpool *pool = (struct threadpool*)arg;
struct job *pjob = NULL;
while (1) //死循环
{
pthread_mutex_lock(&(pool->mutex));
while ((pool->queue_cur_num == 0) && !pool->pool_close) //队列为空时，就等待队列非空
{
pthread_cond_wait(&(pool->queue_not_empty), &(pool->mutex));
}
if (pool->pool_close) //线程池关闭，线程就退出
{
pthread_mutex_unlock(&(pool->mutex));
pthread_exit(NULL);
}
pool->queue_cur_num--;
pjob = pool->head;
if (pool->queue_cur_num == 0)
{
pool->head = pool->tail = NULL;
}
else
{
pool->head = pjob->next;
}
if (pool->queue_cur_num == 0)
{
pthread_cond_signal(&(pool->queue_empty)); //队列为空，就可以通知threadpool_destroy函数，销毁线程函数
}
if (pool->queue_cur_num == pool->queue_max_num - 1)
{
pthread_cond_broadcast(&(pool->queue_not_full)); //队列非满，就可以通知threadpool_add_job函数，添加新任务
}
pthread_mutex_unlock(&(pool->mutex));
(*(pjob->callback_function))(pjob->arg); //线程真正要做的工作，回调函数的调用
free(pjob);
pjob = NULL;
}
}
int threadpool_destroy(struct threadpool *pool)
{
assert(pool != NULL);
pthread_mutex_lock(&(pool->mutex));
if (pool->queue_close || pool->pool_close) //线程池已经退出了，就直接返回
{
pthread_mutex_unlock(&(pool->mutex));
return -1;
}
pool->queue_close = 1; //置队列关闭标志
while (pool->queue_cur_num != 0)
{
pthread_cond_wait(&(pool->queue_empty), &(pool->mutex)); //等待队列为空
}
pool->pool_close = 1; //置线程池关闭标志
pthread_mutex_unlock(&(pool->mutex));
pthread_cond_broadcast(&(pool->queue_not_empty)); //唤醒线程池中正在阻塞的线程
pthread_cond_broadcast(&(pool->queue_not_full)); //唤醒添加任务的threadpool_add_job函数
int i;
for (i = 0; i < pool->thread_num; ++i)
{
pthread_join(pool->pthreads[i], NULL); //等待线程池的所有线程执行完毕
}
pthread_mutex_destroy(&(pool->mutex)); //清理资源
pthread_cond_destroy(&(pool->queue_empty));
pthread_cond_destroy(&(pool->queue_not_empty));
pthread_cond_destroy(&(pool->queue_not_full));
free(pool->pthreads);
struct job *p;
while (pool->head != NULL)
{
p = pool->head;
pool->head = p->next;
free(p);
}
free(pool);
return 0;
}
threadpool.h
#ifndef __THREADPOOL_H_
#define __THREADPOOL_H_
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <signal.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
struct job
{
void* (*callback_function)(void *arg); //线程回调函数
void *arg; //回调函数参数
struct job *next;
};
struct threadpool
{
int thread_num; //线程池中开启线程的个数
int queue_max_num; //队列中最大job的个数
struct job *head; //指向job的头指针
struct job *tail; //指向job的尾指针
pthread_t *pthreads; //线程池中所有线程的pthread_t
pthread_mutex_t mutex; //互斥信号量
pthread_cond_t queue_empty; //队列为空的条件变量
pthread_cond_t queue_not_empty; //队列不为空的条件变量
pthread_cond_t queue_not_full; //队列不为满的条件变量
int queue_cur_num; //队列当前的job个数
int queue_close; //队列是否已经关闭
int pool_close; //线程池是否已经关闭
};
//================================================================================================
//函数名： threadpool_init
//函数描述： 初始化线程池
//输入： [in] thread_num 线程池开启的线程个数
// [in] queue_max_num 队列的最大job个数
//输出： 无
//返回： 成功：线程池地址 失败：NULL
//================================================================================================
struct threadpool* threadpool_init(int thread_num, int queue_max_num);
//================================================================================================
//函数名： threadpool_add_job
//函数描述： 向线程池中添加任务
//输入： [in] pool 线程池地址
// [in] callback_function 回调函数
// [in] arg 回调函数参数
//输出： 无
//返回： 成功：0 失败：-1
//================================================================================================
int threadpool_add_job(struct threadpool *pool, void* (*callback_function)(void *arg), void *arg);
//================================================================================================
//函数名： threadpool_destroy
//函数描述： 销毁线程池
//输入： [in] pool 线程池地址
//输出： 无
//返回： 成功：0 失败：-1
//================================================================================================
int threadpool_destroy(struct threadpool *pool);
//================================================================================================
//函数名： threadpool_function
//函数描述： 线程池中线程函数
//输入： [in] arg 线程池地址
//输出： 无
//返回： 无
//================================================================================================
void* threadpool_function(void* arg);
#endif
main.c
#include "threadpool.h"
void* work(void* arg)
{
char *p = (char*) arg;
// printf("en led....\n");
usleep(200);
printf("threadpool callback fuction : %d.\n", *p);
}
#define EN 1
char num[20] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};
int main(void)
{
int i = 0;
struct threadpool *pool = threadpool_init(1, 30);
while(1)
{
threadpool_add_job(pool, work,&num[i]);
if(i++ == 15) i =0;
// sleep(1);
}
sleep(5);
threadpool_destroy(pool);
return 0;
}