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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. The lock callbacks and stuff assume OpenSSL <1.1 or GnuTLS
- * (libgcrypt) so far.
- *
- * OpenSSL docs for this:
- * https://www.openssl.org/docs/man1.0.2/man3/CRYPTO_num_locks.html
- * gcrypt docs for this:
- * https://gnupg.org/documentation/manuals/gcrypt/Multi_002dThreading.html
- */
- #define USE_OPENSSL /* or USE_GNUTLS accordingly */
- #include <stdio.h>
- #include <pthread.h>
- #include <curl/curl.h>
- #define NUMT 4
- /* we have this global to let the callback get easy access to it */
- static pthread_mutex_t *lockarray;
- #ifdef USE_OPENSSL
- #include <openssl/crypto.h>
- static void lock_callback(int mode, int type, char *file, int line)
- {
- (void)file;
- (void)line;
- if(mode & CRYPTO_LOCK) {
- pthread_mutex_lock(&(lockarray[type]));
- }
- else {
- pthread_mutex_unlock(&(lockarray[type]));
- }
- }
- static unsigned long thread_id(void)
- {
- unsigned long ret;
- ret = (unsigned long)pthread_self();
- return ret;
- }
- static void init_locks(void)
- {
- int i;
- lockarray = (pthread_mutex_t *)OPENSSL_malloc(CRYPTO_num_locks() *
- sizeof(pthread_mutex_t));
- for(i = 0; i<CRYPTO_num_locks(); i++) {
- pthread_mutex_init(&(lockarray[i]), NULL);
- }
- CRYPTO_set_id_callback((unsigned long (*)())thread_id);
- CRYPTO_set_locking_callback((void (*)())lock_callback);
- }
- static void kill_locks(void)
- {
- int i;
- CRYPTO_set_locking_callback(NULL);
- for(i = 0; i<CRYPTO_num_locks(); i++)
- pthread_mutex_destroy(&(lockarray[i]));
- OPENSSL_free(lockarray);
- }
- #endif
- #ifdef USE_GNUTLS
- #include <gcrypt.h>
- #include <errno.h>
- GCRY_THREAD_OPTION_PTHREAD_IMPL;
- void init_locks(void)
- {
- gcry_control(GCRYCTL_SET_THREAD_CBS);
- }
- #define kill_locks()
- #endif
- /* List of URLs to fetch.*/
- 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);
- init_locks();
- 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);
- }
- kill_locks();
- return 0;
- }
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