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Annotation of embedaddon/curl/docs/examples/multithread.c, revision 1.1

1.1     ! misho       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: }