用线程和互斥锁实现的简单的卖票系统

#include <stdio.h>#include <pthread.h>#include <semaphore.h>#include <time.h>#include <string.h>int ticket = 100;   // 票// 互斥锁pthread_mutex_t mutex;// 卖票线程void *sale_ticket(void *v){int window = (int)v;printf ("窗口 %d  开始卖票\n", window);while (1){int time = rand() % 100 + 1;usleep(time*10000);// 卖票前要先抢锁pthread_mutex_lock(&mutex);if (ticket == 0){pthread_mutex_unlock(&mutex);break;}printf ("窗口 %d  卖票了一张票 ： %d\n", window, ticket);ticket--;pthread_mutex_unlock(&mutex);}}int main(){srand ((unsigned int)time(NULL));// 初始化互斥锁pthread_mutex_init(&mutex, NULL);// 创建卖票的线程int i = 0;for (i = 1; i < 5; i++){pthread_t therad_id;pthread_create(&therad_id, NULL, sale_ticket, (void*)i);pthread_detach(therad_id);}pthread_exit(NULL);// 销毁互斥锁pthread_mutex_destroy(&mutex);return 0;}

昨天是用共享内存和信号量实现的，今天通过多线程和互斥锁实现，线程相比较于进程，进程所消耗的CPU资源多，进程间通信复杂，线程通信简单方便。