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