#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*) &siz;;

    uv_async_init(loop, &async, print_progress);

    uv_queue_work(loop, &req, fake_download, after);

    return uv_run(loop, UV_RUN_DEFAULT);

}