pthread_kill的用法

最新推荐文章于 2021-11-17 21:49:00 发布

转载最新推荐文章于 2021-11-17 21:49:00 发布 · 2.8k 阅读

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本文介绍了一个使用C语言实现的多线程程序示例，其中包括如何创建线程、处理信号、阻塞信号等关键操作。通过两个不同的线程，演示了在接收到信号时线程的不同行为。

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#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
void sighand(int signo){
fprintf(stdout, "Thread %u in signal handler\n", (unsigned int )pthread_self());
}

void* func(void* param){
unsigned int uid = (unsigned int)pthread_self();
printf("enter thread %u\n", uid);
int rc = sleep(30);
if(rc != 0){
fprintf(stderr, "thread %u fail\n", uid);
return NULL;
}
fprintf(stdout, "thread %u success\n", uid);
return NULL;
}

void* maskedFunc(void* param){
unsigned int uid = (unsigned int)pthread_self();
printf("enter masked thread %u\n", uid);
sigset_t mask;
int rc;
sigfillset(&mask);
rc = pthread_sigmask(SIG_BLOCK, &mask, NULL);
if(rc != 0){
fprintf(stderr, "error occured in thread %u", uid);
return NULL;
}
rc = sleep(30);
if(rc != 0){
fprintf(stderr, "masked thread %u fail\n", uid);
return NULL;
}
fprintf(stdout, "masked thread %u success\n", uid);
return NULL;
}

int main(int argc, char **argv){
struct sigaction actions;
memset(&actions, 0, sizeof(actions));
sigemptyset(&actions.sa_mask);
actions.sa_flags = 0;
actions.sa_handler = sighand;
sigaction(SIGALRM, &actions, NULL);
int rc;
pthread_t pid1, pid2;
rc = pthread_create(&pid1, NULL, func, NULL);
if(rc != 0){
fprintf(stderr, "error:%s\n", strerror(rc));
}
rc = pthread_create(&pid2, NULL, maskedFunc, NULL);
if(rc != 0){
fprintf(stderr, "error:%s\n", strerror(rc));
}
sleep(3);
//send msg
pthread_kill(pid1, SIGALRM);
pthread_kill(pid2, SIGALRM);

//wait for threads to complete
pthread_join(pid1, NULL);
pthread_join(pid2, NULL);

fprintf(stdout, "main thread complete\n");
}