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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <unistd.h>
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4
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5 #include <uv.h>
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6
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7 #define FIB_UNTIL 25
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8 uv_loop_t *loop;
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9 uv_work_t fib_reqs[FIB_UNTIL];
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10
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11 long fib_(long t) {
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12 if (t == 0 || t == 1)
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13 return 1;
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14 else
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15 return fib_(t-1) + fib_(t-2);
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16 }
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17
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18 void fib(uv_work_t *req) {
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19 int n = *(int *) req->data;
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20 if (random() % 2)
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21 sleep(1);
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22 else
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23 sleep(3);
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24 long fib = fib_(n);
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25 fprintf(stderr, "%dth fibonacci is %lu\n", n, fib);
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26 }
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27
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28 void after_fib(uv_work_t *req, int status) {
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29 if (status == UV_ECANCELED)
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30 fprintf(stderr, "Calculation of %d cancelled.\n", *(int *) req->data);
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31 }
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32
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33 void signal_handler(uv_signal_t *req, int signum)
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34 {
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35 printf("Signal received!\n");
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36 int i;
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37 for (i = 0; i < FIB_UNTIL; i++) {
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38 uv_cancel((uv_req_t*) &fib_reqs[i]);
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39 }
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40 uv_signal_stop(req);
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41 }
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42
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43 int main() {
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44 loop = uv_default_loop();
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45
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46 int data[FIB_UNTIL];
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47 int i;
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48 for (i = 0; i < FIB_UNTIL; i++) {
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49 data[i] = i;
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50 fib_reqs[i].data = (void *) &data[i];
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51 uv_queue_work(loop, &fib_reqs[i], fib, after_fib);
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52 }
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53
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54 uv_signal_t sig;
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55 uv_signal_init(loop, &sig);
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56 uv_signal_start(&sig, signal_handler, SIGINT);
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57
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58 return uv_run(loop, UV_RUN_DEFAULT);
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59 }
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