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 * Show the required mutex callback setups for GnuTLS and OpenSSL when using
26 * libcurl multi-threaded.
27 * </DESC>
28 */
29 /* A multi-threaded example that uses pthreads and fetches 4 remote files at
30 * once over HTTPS.
31 *
32 * Recent versions of OpenSSL and GnuTLS are thread safe by design, assuming
33 * support for the underlying OS threading API is built-in. Older revisions
34 * of this example demonstrated locking callbacks for the SSL library, which
35 * are no longer necessary. An older revision with callbacks can be found at
36 * https://github.com/curl/curl/blob/curl-7_88_1/docs/examples/threaded-ssl.c
37 */
38
39 #define USE_OPENSSL /* or USE_GNUTLS accordingly */
40
41 #include <stdio.h>
42 #include <pthread.h>
43 #include <curl/curl.h>
44
45 #define NUMT 4
46
47 /* List of URLs to fetch.*/
48 static const char * const urls[]= {
49 "https://www.example.com/",
50 "https://www2.example.com/",
51 "https://www3.example.com/",
52 "https://www4.example.com/",
53 };
54
pull_one_url(void * url)55 static void *pull_one_url(void *url)
56 {
57 CURL *curl;
58
59 curl = curl_easy_init();
60 curl_easy_setopt(curl, CURLOPT_URL, url);
61 /* this example does not verify the server's certificate, which means we
62 might be downloading stuff from an impostor */
63 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
64 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
65 curl_easy_perform(curl); /* ignores error */
66 curl_easy_cleanup(curl);
67
68 return NULL;
69 }
70
main(int argc,char ** argv)71 int main(int argc, char **argv)
72 {
73 pthread_t tid[NUMT];
74 int i;
75 (void)argc; /* we do not use any arguments in this example */
76 (void)argv;
77
78 /* Must initialize libcurl before any threads are started */
79 curl_global_init(CURL_GLOBAL_ALL);
80
81 for(i = 0; i < NUMT; i++) {
82 int error = pthread_create(&tid[i],
83 NULL, /* default attributes please */
84 pull_one_url,
85 (void *)urls[i]);
86 if(0 != error)
87 fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
88 else
89 fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
90 }
91
92 /* now wait for all threads to terminate */
93 for(i = 0; i < NUMT; i++) {
94 pthread_join(tid[i], NULL);
95 fprintf(stderr, "Thread %d terminated\n", i);
96 }
97
98 return 0;
99 }
100
