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POSIX Timer 예제



#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;


#define SIGTIMER (SIGRTMAX)
#define ONESHOTTIMER (SIGRTMAX-1)

timer_t SetTimer(int signo, int sec, int mode);
void SignalHandler(int signo, siginfo_t * info, void *context);
timer_t timerid,oneshotTimer;

int main()
{
	struct sigaction sigact;

	sigemptyset(&sigact.sa_mask);
	sigact.sa_flags = SA_SIGINFO;
	sigact.sa_sigaction = SignalHandler;

	// Set up sigaction to catch signal
	if (sigaction(SIGTIMER, &sigact, NULL) == -1) {
		perror("sigaction failed");
		return -1;
	}
	// Set up sigaction to catch signal
	if (sigaction(ONESHOTTIMER, &sigact, NULL) == -1) {
		perror("sigaction failed");
		return -1;
	}
	// Establish a handler to catch CTRL+C and use it for exiting
	sigaction(SIGINT, &sigact, NULL);

	timerid = SetTimer(SIGTIMER, 500, 1);
	oneshotTimer = SetTimer(ONESHOTTIMER, 5000, 0);
	while(1);
	return 0;
}
timer_t SetTimer(int signo, int sec, int mode)
{
	struct sigevent sigev;
	timer_t timerid;
	struct itimerspec itval;
	struct itimerspec oitval;

	// Create the POSIX timer to generate signo
	sigev.sigev_notify = SIGEV_SIGNAL;
	sigev.sigev_signo = signo;
	sigev.sigev_value.sival_ptr = &timerid;

	if (timer_create(CLOCK_REALTIME, &sigev, &timerid) == 0) {
		itval.it_value.tv_sec = sec / 1000;
		itval.it_value.tv_nsec = (long)(sec % 1000) * (1000000L);

		if (mode == 1) {
			itval.it_interval.tv_sec = itval.it_value.tv_sec;
			itval.it_interval.tv_nsec = itval.it_value.tv_nsec;
		} else {
			itval.it_interval.tv_sec = 0;
			itval.it_interval.tv_nsec = 0;
		}

		if (timer_settime(timerid, 0, &itval, &oitval) != 0) {
			perror("time_settime error!");
		}
	} else {
		perror("timer_create error!");
		return (timer_t)-1;
	}
	return timerid;
}
void SignalHandler(int signo, siginfo_t * info, void *context)
{
	if (signo == SIGTIMER) {
		puts("Periodic timer");
	}
	else if (signo == ONESHOTTIMER) {
		puts("One-short timer");
	}
	else if (signo == SIGINT) {
		timer_delete(oneshotTimer);
		timer_delete(timerid);
		perror("Ctrl + C cached!\n");
		exit(1);
	}
}


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