多线程中,信号在哪个线程中处理是不确定的,可能被任意一个线程处理
下边的代码可以验证该结论,多次Ctrl+c,会被不同的线程捕获此信号,并处理,最终每个线程死锁,阻塞在等待锁的状态
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <pthread.h>
#include <unistd.h>
pthread_mutex_t lock;
// 信号处理函数
void sigint_handler(int signum) {printf("Received SIGINT signal, %ld\n",pthread_self());printf("lock line %d\n",__LINE__);pthread_mutex_lock(&lock);//usleep(100);pthread_mutex_unlock(&lock);printf("unlock line %d\n",__LINE__);
}// 线程函数
void* thread_func(void* arg) {while (1) { printf("thread process, %ld\n",pthread_self());usleep(100000);}return NULL;
}int main() {signal(SIGINT, sigint_handler); // 注册SIGINT信号的处理函数printf("main process, %ld\n",pthread_self());pthread_t thread1, thread2;pthread_create(&thread1, NULL, thread_func, NULL); // 创建一个新线程pthread_create(&thread2, NULL, thread_func, NULL); // 创建一个新线程while(1){printf("lock line %d\n",__LINE__); pthread_mutex_lock(&lock);usleep(100000);pthread_mutex_unlock(&lock);printf("unlock line %d\n",__LINE__);}pthread_join(thread1, NULL); // 等待新线程退出pthread_join(thread2, NULL); // 等待新线程退出return 0;
}
Linux多线程信号处理浅谈_linux信号处理函数在哪个线程_hdxbw-wq的博客-CSDN博客