Return to multithread.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / curl / docs / examples

curl

    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2019, 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.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: /* <DESC>
   23:  * A multi-threaded example that uses pthreads to fetch several files at once
   24:  * </DESC>
   25:  */
   26: 
   27: #include <stdio.h>
   28: #include <pthread.h>
   29: #include <curl/curl.h>
   30: 
   31: #define NUMT 4
   32: 
   33: /*
   34:   List of URLs to fetch.
   35: 
   36:   If you intend to use a SSL-based protocol here you might need to setup TLS
   37:   library mutex callbacks as described here:
   38: 
   39:   https://curl.haxx.se/libcurl/c/threadsafe.html
   40: 
   41: */
   42: const char * const urls[NUMT]= {
   43:   "https://curl.haxx.se/",
   44:   "ftp://cool.haxx.se/",
   45:   "https://www.cag.se/",
   46:   "www.haxx.se"
   47: };
   48: 
   49: static void *pull_one_url(void *url)
   50: {
   51:   CURL *curl;
   52: 
   53:   curl = curl_easy_init();
   54:   curl_easy_setopt(curl, CURLOPT_URL, url);
   55:   curl_easy_perform(curl); /* ignores error */
   56:   curl_easy_cleanup(curl);
   57: 
   58:   return NULL;
   59: }
   60: 
   61: 
   62: /*
   63:    int pthread_create(pthread_t *new_thread_ID,
   64:    const pthread_attr_t *attr,
   65:    void * (*start_func)(void *), void *arg);
   66: */
   67: 
   68: int main(int argc, char **argv)
   69: {
   70:   pthread_t tid[NUMT];
   71:   int i;
   72: 
   73:   /* Must initialize libcurl before any threads are started */
   74:   curl_global_init(CURL_GLOBAL_ALL);
   75: 
   76:   for(i = 0; i< NUMT; i++) {
   77:     int error = pthread_create(&tid[i],
   78:                                NULL, /* default attributes please */
   79:                                pull_one_url,
   80:                                (void *)urls[i]);
   81:     if(0 != error)
   82:       fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
   83:     else
   84:       fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
   85:   }
   86: 
   87:   /* now wait for all threads to terminate */
   88:   for(i = 0; i< NUMT; i++) {
   89:     pthread_join(tid[i], NULL);
   90:     fprintf(stderr, "Thread %d terminated\n", i);
   91:   }
   92: 
   93:   return 0;
   94: }