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Annotation of embedaddon/curl/docs/examples/opensslthreadlock.c, revision 1.1.1.1

1.1       misho       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: }