#include <u.h>
#include <libc.h>
#include <stdio.h>

void
alarmhandler(void *a, char *msg)
{
	USED(a);
	if(strstr(msg, "alarm") != 0) {
		printf("received alarm signal %s\n", msg);
		noted(NCONT);
	}
}

int
timer(char *msg, int ms)
{
	int pid, apid;

	pid = getpid();
	switch (apid = fork()) {
	case -1:
		sysfatal("fork failed: %r");
	case 0:
		sleep(ms);
		postnote(PNPROC, pid, msg);
		exits(nil);
	default:
		break;
	}
	return apid;
}

void
main(int argc, char **argv)
{
	int pid, t1pid, t2pid, count = 0;
	notify(alarmhandler);

	t1pid = timer("fooalarm", 750); count++;
	t2pid = timer("baralarm", 250); count++;

	alarm(500);
	while (count > 0) {
		pid = waitpid();
		if (pid == t1pid) count--;
		if (pid == t2pid) count--;
	}

	exits(nil);
}