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 */
44 static const char * const urls[NUMT]= {
45 "https://curl.se/",
46 "ftp://example.com/",
47 "https://example.net/",
48 "www.example"
49 };
50
pull_one_url(void * url)51 static 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
main(void)70 int main(void)
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
