POSIXインターバルタイマの例

#include <inttypes.h>
#include <pthread.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void TimerHandler( union sigval sv ) {
  printf( "TimerHandler!\n" );
}

int main() {
    timer_t timer;
    struct sigevent sev;
    memset( &sev, 0, sizeof( sev ) );
    sev.sigev_value.sival_int = 1;
    sev.sigev_notify = SIGEV_THREAD;
    sev.sigev_notify_function = TimerHandler;
    sev.sigev_notify_attributes = NULL;
    timer_create( CLOCK_REALTIME, &sev, &timer );

    struct itimerspec its;
    memset( &its, 0, sizeof( its ) );
    its.it_value.tv_sec = 0;
    its.it_value.tv_nsec = 500L*1000*1000;      // 500ms
    its.it_interval.tv_sec = its.it_value.tv_sec;
    its.it_interval.tv_nsec = its.it_value.tv_nsec;
    timer_settime( timer, 0, &its, NULL );

    while ( 1 ) {
        sleep( 1 );
    }
}