线程的创建、加锁

#include <stdio.h>

#include <unistd.h>

#include <pthread.h>

int tickets=1000;

pthread_mutex_t mutex;

void* sellticket(void*arg){

        //加锁

        while(1){

        pthread_mutex_lock(&mutex);

        if(tickets>0){

            usleep(6000);

            printf("%ld正在卖%d张门票\n",pthread_self(),tickets);

            tickets --;

        }else{

            pthread_mutex_unlock(&mutex);

            break;

        }

        pthread_mutex_unlock(&mutex);

        }

        return NULL; 

}

int main(){

    //创建一个互斥量

    pthread_mutex_init(&mutex,NULL);

    //创建3个子线程

    pthread_t tid1,tid2,tid3;

    pthread_create(&tid1,NULL,sellticket,NULL);

    pthread_create(&tid2,NULL,sellticket,NULL);

    pthread_create(&tid3,NULL,sellticket,NULL);

    //回收子线程

    pthread_join(tid1,NULL);

    pthread_join(tid2,NULL);

    pthread_join(tid3,NULL);

    pthread_exit(NULL);//退出主线程

    //设置线程分离

    //pthread_detach(tid1);

    //pthread_detach(tid2);

    //pthread_detach(tid3);

    pthread_mutex_destroy(&mutex);

    return 0;

}