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comparison third_party/libuv/docs/code/queue-cancel/main.c @ 173:827c6ac504cd hg-web

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Merged in default here.
author MrJuneJune <me@mrjunejune.com>
date Mon, 19 Jan 2026 18:59:10 -0800
parents 948de3f54cea
children
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151:c033667da5f9 173:827c6ac504cd
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <unistd.h>
4
5 #include <uv.h>
6
7 #define FIB_UNTIL 25
8 uv_loop_t *loop;
9 uv_work_t fib_reqs[FIB_UNTIL];
10
11 long fib_(long t) {
12 if (t == 0 || t == 1)
13 return 1;
14 else
15 return fib_(t-1) + fib_(t-2);
16 }
17
18 void fib(uv_work_t *req) {
19 int n = *(int *) req->data;
20 if (random() % 2)
21 sleep(1);
22 else
23 sleep(3);
24 long fib = fib_(n);
25 fprintf(stderr, "%dth fibonacci is %lu\n", n, fib);
26 }
27
28 void after_fib(uv_work_t *req, int status) {
29 if (status == UV_ECANCELED)
30 fprintf(stderr, "Calculation of %d cancelled.\n", *(int *) req->data);
31 }
32
33 void signal_handler(uv_signal_t *req, int signum)
34 {
35 printf("Signal received!\n");
36 int i;
37 for (i = 0; i < FIB_UNTIL; i++) {
38 uv_cancel((uv_req_t*) &fib_reqs[i]);
39 }
40 uv_signal_stop(req);
41 }
42
43 int main() {
44 loop = uv_default_loop();
45
46 int data[FIB_UNTIL];
47 int i;
48 for (i = 0; i < FIB_UNTIL; i++) {
49 data[i] = i;
50 fib_reqs[i].data = (void *) &data[i];
51 uv_queue_work(loop, &fib_reqs[i], fib, after_fib);
52 }
53
54 uv_signal_t sig;
55 uv_signal_init(loop, &sig);
56 uv_signal_start(&sig, signal_handler, SIGINT);
57
58 return uv_run(loop, UV_RUN_DEFAULT);
59 }