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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/* <DESC>
* Show the required mutex callback setups for GnuTLS and OpenSSL when using
* libcurl multi-threaded.
* </DESC>
*/
/* A multi-threaded example that uses pthreads and fetches 4 remote files at
* once over HTTPS.
*
* Recent versions of OpenSSL and GnuTLS are thread safe by design, assuming
* support for the underlying OS threading API is built-in. Older revisions
* of this example demonstrated locking callbacks for the SSL library, which
* are no longer necessary. An older revision with callbacks can be found at
* https://github.com/curl/curl/blob/curl-7_88_1/docs/examples/threaded-ssl.c
*/
#define USE_OPENSSL /* or USE_GNUTLS accordingly */
#include <stdio.h>
#include <pthread.h>
#include <curl/curl.h>
#define NUMT 4
/* List of URLs to fetch.*/
static const char * const urls[]= {
"https://www.example.com/",
"https://www2.example.com/",
"https://www3.example.com/",
"https://www4.example.com/",
};
static void *pull_one_url(void *url)
{
CURL *curl;
curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, url);
/* this example does not verify the server's certificate, which means we
might be downloading stuff from an impostor */
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_perform(curl); /* ignores error */
curl_easy_cleanup(curl);
return NULL;
}
int main(int argc, char **argv)
{
pthread_t tid[NUMT];
int i;
(void)argc; /* we do not use any arguments in this example */
(void)argv;
/* Must initialize libcurl before any threads are started */
curl_global_init(CURL_GLOBAL_ALL);
for(i = 0; i < NUMT; i++) {
int error = pthread_create(&tid[i],
NULL, /* default attributes please */
pull_one_url,
(void *)urls[i]);
if(0 != error)
fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
else
fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
}
/* now wait for all threads to terminate */
for(i = 0; i < NUMT; i++) {
pthread_join(tid[i], NULL);
fprintf(stderr, "Thread %d terminated\n", i);
}
return 0;
}