C线程池

参考大神思路，写下加强理解。

#include "pthread.h"
#include "stdio.h"
#include "stdlib.h"
struct Job{
    void*(*callback_function)(void*);
    void* arg;
    Job* next;
    Job():next(NULL){}
};
struct threadpool{
    pthread_mutex_t ready;
    pthread_cond_t empty,not_empty,not_full;
    int max_job_num,cur_job_num;
    struct Job*head,*tail;
    pthread_t *tid;
    int closepool;
    int status;
};
int threadpool_init(threadpool*pool);
int threadpool_add_job(threadpool*pool,void*(*work)(void*),void*arg);
int threadpool_destroy(threadpool*pool);
void* threadpool_deal(void*arg);
//实现
int threadpool_init(threadpool*pool,int max){
    if(pthread_mutex_init(&pool->ready,NULL)){
        printf("mutex init fail!\n");
        return -1;
    }
    if(pthread_cond_init(&pool->empty,NULL)){
        printf("cond init fail!\n");
        return -1;
    }
    if(pthread_cond_init(&pool->not_empty,NULL)){
        printf("cond init fail!\n");
        return -1;
    }
    if(pthread_cond_init(&pool->not_full,NULL)){
        printf("cond init fail!\n");
        return -1;
    }
    pool->max_job_num=max;
    pool->cur_job_num=0;
    pool->head=NULL;
    pool->tail=NULL;
    pool->closepool=0;
    pool->status=0;
    pool->tid=(pthread_t*)malloc(max*sizeof(pthread_t));
    if(pool->tid==NULL){
        printf("malloc fail!\n");
        return -1;
    }
    int i;
    for(i=0;itid[i],NULL,threadpool_deal,(void*)pool);
    }
    return 0;
}
int threadpool_add_job(threadpool*pool,void*(*work)(void*),void*arg){
    pthread_mutex_lock(&pool->ready);
    while(pool->cur_job_num==pool->max_job_num)pthread_cond_wait(&pool->not_full,&pool->ready);
    if(pool->closepool){
        pthread_mutex_unlock(&pool->ready);
        return -1;
    }
    struct Job*job=(Job*)malloc(sizeof(Job));
    job->callback_function=work;
    job->arg=arg;
    if(pool->head==NULL){
        pool->head=job;
        pool->tail=job;
    }else{
        pool->tail->next=job;
        pool->tail=pool->tail->next;
    }
    pool->cur_job_num++;
    if(pool->cur_job_num==1)pthread_cond_broadcast(&pool->not_empty);
    pthread_mutex_unlock(&pool->ready);
    return 0;
}
void* threadpool_deal(void*arg){
    threadpool* pool=(threadpool*)arg;
    while(1){
        pthread_mutex_lock(&pool->ready);
        while(pool->cur_job_num==0&&pool->closepool==0)pthread_cond_wait(&pool->not_empty,&pool->ready);
        if(pool->closepool&&pool->cur_job_num==0){
         //   printf("i have exited!\n");
            pthread_mutex_unlock(&pool->ready);
            pthread_exit(NULL);
        }
       // printf("now cur_job_num:%d\n",pool->cur_job_num);
        struct Job*job=pool->head;
        if(pool->cur_job_num==1){
            pool->head=NULL;
            pool->tail=NULL;
        }else{
            pool->head=pool->head->next;
        }
        pool->cur_job_num--;
        if(pool->cur_job_num==pool->max_job_num-1)pthread_cond_broadcast(&pool->not_full);
        if(pool->cur_job_num==0)pthread_cond_signal(&pool->empty);
        pthread_mutex_unlock(&pool->ready);
       // printf("job canshu:%d\n",*(int*)job->arg);
        (*(job->callback_function))(job->arg);
        free(job);
    }
}
int threadpool_destroy(threadpool*pool){
    pthread_mutex_lock(&pool->ready);
    pool->closepool=1;
    int i;
    while(pool->cur_job_num!=0){
        pthread_cond_wait(&pool->empty,&pool->ready);
    }
    pthread_cond_broadcast(&pool->not_empty);
    pthread_cond_broadcast(&pool->not_full);
    pthread_mutex_unlock(&pool->ready);
    for(i=0;imax_job_num;i++){
        pthread_join(pool->tid[i],NULL);
    }
    free(pool->tid);
    pthread_cond_destroy(&pool->empty);
    pthread_cond_destroy(&pool->not_empty);
    pthread_cond_destroy(&pool->not_full);
    pthread_mutex_destroy(&pool->ready);
    free(pool);
    return 0;
}

（我的代码风格糟糕。。非常糟糕。。）
学习要点：
线程复用的实现
pthread_cond_broadcast()与pthread_cond_signal()
状态量的数目与相应锁的数目保持一致，当然，非对应状态的锁不在此列
条件锁的使用