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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>
* A multi-threaded program using pthreads to fetch several files at once
* </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
*/
/* Requires: HAVE_PTHREAD_H */
/* Also requires TLS support to run */
#include <stdio.h>
#include <pthread.h>
#include <curl/curl.h>
#define NUMT 4
/* List of URLs to fetch. */
static const char * const urls[NUMT] = {
"https://curl.se/",
"ftp://example.com/",
"https://example.net/",
"www.example"
};
struct targ {
const char *url;
};
static void *pull_one_url(void *p)
{
CURL *curl;
curl = curl_easy_init();
if(curl) {
struct targ *targ = p;
curl_easy_setopt(curl, CURLOPT_URL, targ->url);
(void)curl_easy_perform(curl); /* ignores error */
curl_easy_cleanup(curl);
}
return NULL;
}
/*
int pthread_create(pthread_t *new_thread_ID,
const pthread_attr_t *attr,
void * (*start_func)(void *), void *arg);
*/
int main(void)
{
CURLcode result;
pthread_t tid[NUMT];
struct targ targs[NUMT];
int i;
/* Must initialize libcurl before any threads are started */
result = curl_global_init(CURL_GLOBAL_ALL);
if(result)
return (int)result;
for(i = 0; i < NUMT; i++) {
int error;
targs[i].url = urls[i];
error = pthread_create(&tid[i],
NULL, /* default attributes please */
pull_one_url,
(void *)&targs[i]);
if(error)
fprintf(stderr, "Could not 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);
}
curl_global_cleanup();
return 0;
}
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