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comparison mupdf-source/thirdparty/curl/docs/examples/opensslthreadlock.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2017, 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 * one way to set the necessary OpenSSL locking callbacks if you want to do
24 * multi-threaded transfers with HTTPS/FTPS with libcurl built to use OpenSSL.
25 * </DESC>
26 */
27 /*
28 * This is not a complete stand-alone example.
29 *
30 * Author: Jeremy Brown
31 */
32
33 #include <stdio.h>
34 #include <pthread.h>
35 #include <openssl/err.h>
36
37 #define MUTEX_TYPE pthread_mutex_t
38 #define MUTEX_SETUP(x) pthread_mutex_init(&(x), NULL)
39 #define MUTEX_CLEANUP(x) pthread_mutex_destroy(&(x))
40 #define MUTEX_LOCK(x) pthread_mutex_lock(&(x))
41 #define MUTEX_UNLOCK(x) pthread_mutex_unlock(&(x))
42 #define THREAD_ID pthread_self()
43
44
45 void handle_error(const char *file, int lineno, const char *msg)
46 {
47 fprintf(stderr, "** %s:%d %s\n", file, lineno, msg);
48 ERR_print_errors_fp(stderr);
49 /* exit(-1); */
50 }
51
52 /* This array will store all of the mutexes available to OpenSSL. */
53 static MUTEX_TYPE *mutex_buf = NULL;
54
55 static void locking_function(int mode, int n, const char *file, int line)
56 {
57 if(mode & CRYPTO_LOCK)
58 MUTEX_LOCK(mutex_buf[n]);
59 else
60 MUTEX_UNLOCK(mutex_buf[n]);
61 }
62
63 static unsigned long id_function(void)
64 {
65 return ((unsigned long)THREAD_ID);
66 }
67
68 int thread_setup(void)
69 {
70 int i;
71
72 mutex_buf = malloc(CRYPTO_num_locks() * sizeof(MUTEX_TYPE));
73 if(!mutex_buf)
74 return 0;
75 for(i = 0; i < CRYPTO_num_locks(); i++)
76 MUTEX_SETUP(mutex_buf[i]);
77 CRYPTO_set_id_callback(id_function);
78 CRYPTO_set_locking_callback(locking_function);
79 return 1;
80 }
81
82 int thread_cleanup(void)
83 {
84 int i;
85
86 if(!mutex_buf)
87 return 0;
88 CRYPTO_set_id_callback(NULL);
89 CRYPTO_set_locking_callback(NULL);
90 for(i = 0; i < CRYPTO_num_locks(); i++)
91 MUTEX_CLEANUP(mutex_buf[i]);
92 free(mutex_buf);
93 mutex_buf = NULL;
94 return 1;
95 }