1#include <stdio.h> 2#include <stdlib.h> 3#include <unistd.h> 4 5#include <uv.h> 6 7uv_loop_t *loop; 8uv_async_t async; 9 10double percentage; 11 12void 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 26void after(uv_work_t *req, int status) { 27 fprintf(stderr, "Download complete\n"); 28 uv_close((uv_handle_t*) &async, NULL); 29} 30 31void print_progress(uv_async_t *handle) { 32 double percentage = *((double*) handle->data); 33 fprintf(stderr, "Downloaded %.2f%%\n", percentage); 34} 35 36int 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