pthread_kill的用法

#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");
}