#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <uv.h>

#define FIB_UNTIL 25

uv_loop_t *loop;

uv_work_t fib_reqs[FIB_UNTIL];

long fib_(long t) {

    if (t == 0 || t == 1)

        return 1;

    else

        return fib_(t-1) + fib_(t-2);

}

void fib(uv_work_t *req) {

    int n = *(int *) req->data;

    if (random() % 2)

        sleep(1);

    else

        sleep(3);

    long fib = fib_(n);

    fprintf(stderr, "%dth fibonacci is %lu\n", n, fib);

}

void after_fib(uv_work_t *req, int status) {

    if (status == UV_ECANCELED)

        fprintf(stderr, "Calculation of %d cancelled.\n", *(int *) req->data);

}

void signal_handler(uv_signal_t *req, int signum)

{

    printf("Signal received!\n");

    int i;

    for (i = 0; i < FIB_UNTIL; i++) {

        uv_cancel((uv_req_t*) &fib_reqs[i]);

    }

    uv_signal_stop(req);

}

int main() {

    loop = uv_default_loop();

    int data[FIB_UNTIL];

    int i;

    for (i = 0; i < FIB_UNTIL; i++) {

        data[i] = i;

        fib_reqs[i].data = (void *) &data[i];

        uv_queue_work(loop, &fib_reqs[i], fib, after_fib);

    }

    uv_signal_t sig;

    uv_signal_init(loop, &sig);

    uv_signal_start(&sig, signal_handler, SIGINT);

    return uv_run(loop, UV_RUN_DEFAULT);

}