libuv/docs/code/progress/main.c

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
#include <uv.h>
 
uv_loop_t *loop;
uv_async_t async;
 
double percentage;
 
void fake_download(uv_work_t *req) {
    int size = *((int*) req->data);
    int downloaded = 0;
    while (downloaded < size) {
        percentage = downloaded*100.0/size;
        async.data = (void*) &percentage;
        uv_async_send(&async);
 
        sleep(1);
        downloaded += (200+random())%1000; // can only download max 1000bytes/sec,
                                           // but at least a 200;
    }
}
 
void after(uv_work_t *req, int status) {
    fprintf(stderr, "Download complete\n");
    uv_close((uv_handle_t*) &async, NULL);
}
 
void print_progress(uv_async_t *handle) {
    double percentage = *((double*) handle->data);
    fprintf(stderr, "Downloaded %.2f%%\n", percentage);
}
 
int main() {
    loop = uv_default_loop();
 
    uv_work_t req;
    int size = 10240;
    req.data = (void*) &size;
 
    uv_async_init(loop, &async, print_progress);
    uv_queue_work(loop, &req, fake_download, after);
 
    return uv_run(loop, UV_RUN_DEFAULT);
}