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