用signal结束多个线程

在创建多线程时，有时可能几个线程里面都是死循环，如果结束这些线程呢？可以用signal(),这里介绍signal的一个应用。
当然，不用signal(),直接按Ctrl+C也可以结束。

 

// file name:signal_to_stop_thread.c// 接收到特定的信号量，结束多个线程#include <stdio.h>#include <stdlib.h>#include <string.h>#include <signal.h>#include <pthread.h>//typedef int bool;#define MY_FALSE 0#define MY_TRUE 1/*** 信号量部份－开始*/typedef struct GlobalData{int quit;pthread_mutex_t mutex;}GlobalData;GlobalData gbl;void init_global_data(){pthread_mutex_init(&gbl.mutex,NULL);gbl.quit = MY_FALSE;}void set_global_data(){pthread_mutex_lock(&gbl.mutex);gbl.quit = MY_TRUE;pthread_mutex_unlock(&gbl.mutex);}int get_global_data(){int temp;pthread_mutex_lock(&gbl.mutex);temp = gbl.quit;pthread_mutex_unlock(&gbl.mutex);return temp;}void signalHandler(int sig){signal(SIGINT,SIG_DFL);set_global_data();}/*** 多线程部份－开始*/void thread1(void){int i = 0;while(!(get_global_data())){printf("This is a pthread 1111 i = %d./n",i);sleep(1);i++;}printf("stop thread 1/n");pthread_exit(0);}void thread2(void){int i = 0;while(!(get_global_data())){printf("This is a pthread 2222 i = %d./n",i);sleep(1);i++;}printf("stop thread 2/n");pthread_exit(0);}int main(int argc,char *argv[]){pthread_t id1,id2;int ret;/* 初始化全局变量 gbl */init_global_data();/* 初始化SIGINT信号，也就是当输入Ctrl+C时，程序会执行signalHandler */signal(SIGINT, signalHandler);/* 创建线程一 */ret=pthread_create(&id1,NULL,(void *) thread1,NULL);if(ret!=0){printf ("Create pthread 1 error!/n");exit (1);}/* 创建线程二 */ret=pthread_create(&id2,NULL,(void *) thread2,NULL);if(ret!=0){printf ("Create pthread 1 error!/n");exit (1);}/* 等待线程结束 */ pthread_join(id1,NULL); pthread_join(id2,NULL); return 0;}