1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24/* <DESC>
25 * Connection cache shared between easy handles with the share interface
26 * </DESC>
27 */
28#include <stdio.h>
29#include <curl/curl.h>
30
31static void my_lock(CURL *handle, curl_lock_data data,
32                    curl_lock_access laccess, void *useptr)
33{
34  (void)handle;
35  (void)data;
36  (void)laccess;
37  (void)useptr;
38  fprintf(stderr, "-> Mutex lock\n");
39}
40
41static void my_unlock(CURL *handle, curl_lock_data data, void *useptr)
42{
43  (void)handle;
44  (void)data;
45  (void)useptr;
46  fprintf(stderr, "<- Mutex unlock\n");
47}
48
49int main(void)
50{
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 = curl_easy_init();
65    if(curl) {
66      CURLcode res;
67
68      curl_easy_setopt(curl, CURLOPT_URL, "https://curl.se/");
69
70      /* use the share object */
71      curl_easy_setopt(curl, CURLOPT_SHARE, share);
72
73      /* Perform the request, res will get the return code */
74      res = curl_easy_perform(curl);
75      /* Check for errors */
76      if(res != CURLE_OK)
77        fprintf(stderr, "curl_easy_perform() failed: %s\n",
78                curl_easy_strerror(res));
79
80      /* always cleanup */
81      curl_easy_cleanup(curl);
82    }
83  }
84
85  curl_share_cleanup(share);
86  return 0;
87}
88