1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24/* <DESC>
25 * A multi-threaded program using pthreads to fetch several files at once
26 * </DESC>
27 */
28
29#include <stdio.h>
30#include <pthread.h>
31#include <curl/curl.h>
32
33#define NUMT 4
34
35/*
36  List of URLs to fetch.
37
38  If you intend to use a SSL-based protocol here you might need to setup TLS
39  library mutex callbacks as described here:
40
41  https://curl.se/libcurl/c/threadsafe.html
42
43*/
44const char * const urls[NUMT]= {
45  "https://curl.se/",
46  "ftp://example.com/",
47  "https://example.net/",
48  "www.example"
49};
50
51static void *pull_one_url(void *url)
52{
53  CURL *curl;
54
55  curl = curl_easy_init();
56  curl_easy_setopt(curl, CURLOPT_URL, url);
57  curl_easy_perform(curl); /* ignores error */
58  curl_easy_cleanup(curl);
59
60  return NULL;
61}
62
63
64/*
65   int pthread_create(pthread_t *new_thread_ID,
66   const pthread_attr_t *attr,
67   void * (*start_func)(void *), void *arg);
68*/
69
70int main(int argc, char **argv)
71{
72  pthread_t tid[NUMT];
73  int i;
74
75  /* Must initialize libcurl before any threads are started */
76  curl_global_init(CURL_GLOBAL_ALL);
77
78  for(i = 0; i< NUMT; i++) {
79    int error = pthread_create(&tid[i],
80                               NULL, /* default attributes please */
81                               pull_one_url,
82                               (void *)urls[i]);
83    if(0 != error)
84      fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
85    else
86      fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
87  }
88
89  /* now wait for all threads to terminate */
90  for(i = 0; i< NUMT; i++) {
91    pthread_join(tid[i], NULL);
92    fprintf(stderr, "Thread %d terminated\n", i);
93  }
94  curl_global_cleanup();
95  return 0;
96}
97