#include <stdio.h>
#include <pthread.h>
#include <signal.h>

static void *func(void *arg)
{
	sigset_t sig;
	int s;
	sigemptyset(&sig);
	sigaddset(&sig, SIGUSR1);
	pthread_sigmask(SIG_BLOCK, &sig, NULL);
	printf("[sigtest:%d:%d]:func\n", getpid(), pthread_self());
	sleep(3);
	while (1) {
		sigwait(&sig, &s);
		printf("[sigtest:%d:%d]:sigwait %d\n", getpid(), pthread_self(), s);
	}
}

int
main(int argc, char *argv[])
{
	pthread_t tid;
	sigset_t sig;
	int s, i;
	sigemptyset(&sig);
	sigaddset(&sig, SIGUSR1);
	pthread_sigmask(SIG_BLOCK, &sig, NULL);
	printf("[sigtest:%d:%d]:main\n", getpid(), pthread_self());
	pthread_create(&tid, NULL, func, (void *)0);

	while (1) {
		for (i = 10; (i = sleep(i)) > 0; ) /* sleep 10 sec */
			;
		printf("[sigtest:%d:%d]:send SIGUSR1\n", getpid(), pthread_self());
		pthread_kill(tid, SIGUSR1);
	}
	return 0;
}