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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2017, 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 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 inteface
     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   CURL *curl;
     50   CURLcode res;
     51   CURLSH *share;
     52   int i;
     53 
     54   share = curl_share_init();
     55   curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_CONNECT);
     56 
     57   curl_share_setopt(share, CURLSHOPT_LOCKFUNC, my_lock);
     58   curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, my_unlock);
     59 
     60   /* Loop the transfer and cleanup the handle properly every lap. This will
     61      still reuse connections since the pool is in the shared object! */
     62 
     63   for(i = 0; i < 3; i++) {
     64     curl = curl_easy_init();
     65     if(curl) {
     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 }
     86