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    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:  * Connection cache shared between easy handles with the share interface
   24:  * </DESC>
   25:  */
   26: #include <stdio.h>
   27: #include <curl/curl.h>
   28: 
   29: static void my_lock(CURL *handle, curl_lock_data data,
   30:                     curl_lock_access laccess, void *useptr)
   31: {
   32:   (void)handle;
   33:   (void)data;
   34:   (void)laccess;
   35:   (void)useptr;
   36:   fprintf(stderr, "-> Mutex lock\n");
   37: }
   38: 
   39: static void my_unlock(CURL *handle, curl_lock_data data, void *useptr)
   40: {
   41:   (void)handle;
   42:   (void)data;
   43:   (void)useptr;
   44:   fprintf(stderr, "<- Mutex unlock\n");
   45: }
   46: 
   47: int main(void)
   48: {
   49:   CURLSH *share;
   50:   int i;
   51: 
   52:   share = curl_share_init();
   53:   curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_CONNECT);
   54: 
   55:   curl_share_setopt(share, CURLSHOPT_LOCKFUNC, my_lock);
   56:   curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, my_unlock);
   57: 
   58:   /* Loop the transfer and cleanup the handle properly every lap. This will
   59:      still reuse connections since the pool is in the shared object! */
   60: 
   61:   for(i = 0; i < 3; i++) {
   62:     CURL *curl = curl_easy_init();
   63:     if(curl) {
   64:       CURLcode res;
   65: 
   66:       curl_easy_setopt(curl, CURLOPT_URL, "https://curl.haxx.se/");
   67: 
   68:       /* use the share object */
   69:       curl_easy_setopt(curl, CURLOPT_SHARE, share);
   70: 
   71:       /* Perform the request, res will get the return code */
   72:       res = curl_easy_perform(curl);
   73:       /* Check for errors */
   74:       if(res != CURLE_OK)
   75:         fprintf(stderr, "curl_easy_perform() failed: %s\n",
   76:                 curl_easy_strerror(res));
   77: 
   78:       /* always cleanup */
   79:       curl_easy_cleanup(curl);
   80:     }
   81:   }
   82: 
   83:   curl_share_cleanup(share);
   84:   return 0;
   85: }