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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel (at) 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 http://curl.haxx.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  ***************************************************************************/
     22 /* A multi-threaded example that uses pthreads extensively to fetch
     23  * X remote files at once */
     24 
     25 #include <stdio.h>
     26 #include <pthread.h>
     27 #include <curl/curl.h>
     28 
     29 #define NUMT 4
     30 
     31 /*
     32   List of URLs to fetch.
     33 
     34   If you intend to use a SSL-based protocol here you MUST setup the OpenSSL
     35   callback functions as described here:
     36 
     37   http://www.openssl.org/docs/crypto/threads.html#DESCRIPTION
     38 
     39 */
     40 const char * const urls[NUMT]= {
     41   "http://curl.haxx.se/",
     42   "ftp://cool.haxx.se/",
     43   "http://www.contactor.se/",
     44   "www.haxx.se"
     45 };
     46 
     47 static void *pull_one_url(void *url)
     48 {
     49   CURL *curl;
     50 
     51   curl = curl_easy_init();
     52   curl_easy_setopt(curl, CURLOPT_URL, url);
     53   curl_easy_perform(curl); /* ignores error */
     54   curl_easy_cleanup(curl);
     55 
     56   return NULL;
     57 }
     58 
     59 
     60 /*
     61    int pthread_create(pthread_t *new_thread_ID,
     62    const pthread_attr_t *attr,
     63    void * (*start_func)(void *), void *arg);
     64 */
     65 
     66 int main(int argc, char **argv)
     67 {
     68   pthread_t tid[NUMT];
     69   int i;
     70   int error;
     71 
     72   /* Must initialize libcurl before any threads are started */
     73   curl_global_init(CURL_GLOBAL_ALL);
     74 
     75   for(i=0; i< NUMT; i++) {
     76     error = pthread_create(&tid[i],
     77                            NULL, /* default attributes please */
     78                            pull_one_url,
     79                            (void *)urls[i]);
     80     if(0 != error)
     81       fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
     82     else
     83       fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
     84   }
     85 
     86   /* now wait for all threads to terminate */
     87   for(i=0; i< NUMT; i++) {
     88     error = pthread_join(tid[i], NULL);
     89     fprintf(stderr, "Thread %d terminated\n", i);
     90   }
     91 
     92   return 0;
     93 }
     94