1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <unistd.h>
4
5 #include <uv.h>
6
7 uv_loop_t *loop;
8 uv_async_t async;
9
10 double percentage;
11
fake_download(uv_work_t * req)12 void fake_download(uv_work_t *req) {
13 int size = *((int*) req->data);
14 int downloaded = 0;
15 while (downloaded < size) {
16 percentage = downloaded*100.0/size;
17 async.data = (void*) &percentage;
18 uv_async_send(&async);
19
20 sleep(1);
21 downloaded += (200+random())%1000; // can only download max 1000bytes/sec,
22 // but at least a 200;
23 }
24 }
25
after(uv_work_t * req,int status)26 void after(uv_work_t *req, int status) {
27 fprintf(stderr, "Download complete\n");
28 uv_close((uv_handle_t*) &async, NULL);
29 }
30
print_progress(uv_async_t * handle)31 void print_progress(uv_async_t *handle) {
32 double percentage = *((double*) handle->data);
33 fprintf(stderr, "Downloaded %.2f%%\n", percentage);
34 }
35
main()36 int main() {
37 loop = uv_default_loop();
38
39 uv_work_t req;
40 int size = 10240;
41 req.data = (void*) &size;
42
43 uv_async_init(loop, &async, print_progress);
44 uv_queue_work(loop, &req, fake_download, after);
45
46 return uv_run(loop, UV_RUN_DEFAULT);
47 }
48