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: }
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