annotate mupdf-source/thirdparty/curl/docs/examples/opensslthreadlock.c @ 15:393e55ef9200

Explicitely use python3 instead of python
author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 17 Sep 2025 21:11:04 +0200
parents b50eed0cc0ef
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1 /***************************************************************************
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2 * _ _ ____ _
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3 * Project ___| | | | _ \| |
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4 * / __| | | | |_) | |
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5 * | (__| |_| | _ <| |___
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6 * \___|\___/|_| \_\_____|
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7 *
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8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 *
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10 * This software is licensed as described in the file COPYING, which
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11 * you should have received as part of this distribution. The terms
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12 * are also available at https://curl.haxx.se/docs/copyright.html.
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13 *
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14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 * copies of the Software, and permit persons to whom the Software is
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16 * furnished to do so, under the terms of the COPYING file.
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17 *
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18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 * KIND, either express or implied.
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20 *
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21 ***************************************************************************/
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22 /* <DESC>
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23 * one way to set the necessary OpenSSL locking callbacks if you want to do
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24 * multi-threaded transfers with HTTPS/FTPS with libcurl built to use OpenSSL.
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25 * </DESC>
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26 */
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27 /*
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28 * This is not a complete stand-alone example.
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29 *
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30 * Author: Jeremy Brown
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31 */
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33 #include <stdio.h>
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34 #include <pthread.h>
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35 #include <openssl/err.h>
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37 #define MUTEX_TYPE pthread_mutex_t
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38 #define MUTEX_SETUP(x) pthread_mutex_init(&(x), NULL)
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39 #define MUTEX_CLEANUP(x) pthread_mutex_destroy(&(x))
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40 #define MUTEX_LOCK(x) pthread_mutex_lock(&(x))
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41 #define MUTEX_UNLOCK(x) pthread_mutex_unlock(&(x))
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42 #define THREAD_ID pthread_self()
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44
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45 void handle_error(const char *file, int lineno, const char *msg)
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46 {
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47 fprintf(stderr, "** %s:%d %s\n", file, lineno, msg);
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48 ERR_print_errors_fp(stderr);
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49 /* exit(-1); */
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50 }
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51
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52 /* This array will store all of the mutexes available to OpenSSL. */
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53 static MUTEX_TYPE *mutex_buf = NULL;
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54
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55 static void locking_function(int mode, int n, const char *file, int line)
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56 {
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57 if(mode & CRYPTO_LOCK)
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58 MUTEX_LOCK(mutex_buf[n]);
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59 else
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60 MUTEX_UNLOCK(mutex_buf[n]);
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61 }
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62
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63 static unsigned long id_function(void)
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64 {
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65 return ((unsigned long)THREAD_ID);
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66 }
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68 int thread_setup(void)
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69 {
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70 int i;
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72 mutex_buf = malloc(CRYPTO_num_locks() * sizeof(MUTEX_TYPE));
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73 if(!mutex_buf)
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74 return 0;
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75 for(i = 0; i < CRYPTO_num_locks(); i++)
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76 MUTEX_SETUP(mutex_buf[i]);
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77 CRYPTO_set_id_callback(id_function);
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78 CRYPTO_set_locking_callback(locking_function);
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79 return 1;
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80 }
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81
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82 int thread_cleanup(void)
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83 {
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84 int i;
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85
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86 if(!mutex_buf)
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87 return 0;
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88 CRYPTO_set_id_callback(NULL);
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89 CRYPTO_set_locking_callback(NULL);
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90 for(i = 0; i < CRYPTO_num_locks(); i++)
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91 MUTEX_CLEANUP(mutex_buf[i]);
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92 free(mutex_buf);
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93 mutex_buf = NULL;
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94 return 1;
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95 }