#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>

#define SIG SIGRTMIN
#define SIG1 (SIGRTMIN+1)

void *thread1(void *arg) {
    sigset_t set;
    int sig;
    timer_t timer1;
    struct itimerspec its1;
    struct sigevent sev1;
    struct timespec now;

    sigemptyset(&set);
    sigaddset(&set, SIG);

    sev1.sigev_notify = SIGEV_SIGNAL;
    sev1.sigev_signo = SIG;
    timer_create(CLOCK_REALTIME, &sev1, &timer1);

    clock_gettime(CLOCK_REALTIME, &now);
    its1.it_value.tv_sec = now.tv_sec + 2; // 2 seconds delay
    its1.it_value.tv_nsec = now.tv_nsec;
    its1.it_interval.tv_sec = 1; // 1 second interval
    its1.it_interval.tv_nsec = 0;

    timer_settime(timer1, TIMER_ABSTIME, &its1, NULL);

    while (1) {
        sigwait(&set, &sig);
        printf("Wątek 1: obliczenia wznowione\n");
    }
    pthread_exit(NULL);
}

void *thread2(void *arg) {
    sigset_t set;
    int sig;
    timer_t timer2;
    struct itimerspec its2;
    struct sigevent sev2;
    struct timespec now;

    sigemptyset(&set);
    sigaddset(&set, SIG1);

    sev2.sigev_notify = SIGEV_SIGNAL;
    sev2.sigev_signo = SIG1;
    timer_create(CLOCK_REALTIME, &sev2, &timer2);

    clock_gettime(CLOCK_REALTIME, &now);
    its2.it_value.tv_sec = now.tv_sec + 2; // 2 seconds delay
    its2.it_value.tv_nsec = now.tv_nsec;
    its2.it_interval.tv_sec = 5; // 5 seconds interval
    its2.it_interval.tv_nsec = 0;

    timer_settime(timer2, TIMER_ABSTIME, &its2, NULL);

    while (1) {
        sigwait(&set, &sig);
        printf("Wątek 2: obliczenia wznowione\n");
    }
    pthread_exit(NULL);
}

int main() {
    pthread_t t1, t2;

    sigset_t set;
    sigemptyset(&set);
    sigaddset(&set, SIG);
    sigaddset(&set, SIG1);
    pthread_sigmask(SIG_BLOCK, &set, NULL);

    pthread_create(&t1, NULL, thread1, NULL);
    pthread_create(&t2, NULL, thread2, NULL);

    pthread_join(t1, NULL);
    pthread_join(t2, NULL);

    return 0;
}