example/opensslthreadlock: remove

This shows how to setup OpenSSL mutex callbacks, but this is not
necessary since OpenSSL 1.1.0 - meaning that no currently supported
OpenSSL version requires this anymore

Closes #11341

diff --git a/docs/examples/Makefile.inc b/docs/examples/Makefile.inc
index 5462cc370eea39aa982567d302239134c8171ba6..27de95bdf0ca05fe7a927aee1fdfa170c04bbe4f 100644 (file)
--- a/docs/examples/Makefile.inc
+++ b/docs/examples/Makefile.inc
@@ -141,7 +141,6 @@ COMPLICATED_EXAMPLES = \
   multi-event.c \
   multi-uv.c \
   multithread.c \
-  opensslthreadlock.c \
   sessioninfo.c \
   smooth-gtk-thread.c \
   synctime.c \

diff --git a/docs/examples/opensslthreadlock.c b/docs/examples/opensslthreadlock.c
deleted file mode 100644 (file)
index 6f87567..0000000
--- a/docs/examples/opensslthreadlock.c
+++ /dev/null
@@ -1,97 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- * SPDX-License-Identifier: curl
- *
- ***************************************************************************/
-/* <DESC>
- * one way to set the necessary OpenSSL locking callbacks if you want to do
- * multi-threaded transfers with HTTPS/FTPS with libcurl built to use OpenSSL.
- * </DESC>
- */
-/*
- * This is not a complete stand-alone example.
- *
- * Author: Jeremy Brown
- */
-
-#include <stdio.h>
-#include <pthread.h>
-#include <openssl/err.h>
-
-#define MUTEX_TYPE       pthread_mutex_t
-#define MUTEX_SETUP(x)   pthread_mutex_init(&(x), NULL)
-#define MUTEX_CLEANUP(x) pthread_mutex_destroy(&(x))
-#define MUTEX_LOCK(x)    pthread_mutex_lock(&(x))
-#define MUTEX_UNLOCK(x)  pthread_mutex_unlock(&(x))
-#define THREAD_ID        pthread_self()
-
-
-void handle_error(const char *file, int lineno, const char *msg)
-{
-  fprintf(stderr, "** %s:%d %s\n", file, lineno, msg);
-  ERR_print_errors_fp(stderr);
-  /* exit(-1); */
-}
-
-/* This array will store all of the mutexes available to OpenSSL. */
-static MUTEX_TYPE *mutex_buf = NULL;
-
-static void locking_function(int mode, int n, const char *file, int line)
-{
-  if(mode & CRYPTO_LOCK)
-    MUTEX_LOCK(mutex_buf[n]);
-  else
-    MUTEX_UNLOCK(mutex_buf[n]);
-}
-
-static unsigned long id_function(void)
-{
-  return ((unsigned long)THREAD_ID);
-}
-
-int thread_setup(void)
-{
-  int i;
-
-  mutex_buf = malloc(CRYPTO_num_locks() * sizeof(MUTEX_TYPE));
-  if(!mutex_buf)
-    return 0;
-  for(i = 0;  i < CRYPTO_num_locks();  i++)
-    MUTEX_SETUP(mutex_buf[i]);
-  CRYPTO_set_id_callback(id_function);
-  CRYPTO_set_locking_callback(locking_function);
-  return 1;
-}
-
-int thread_cleanup(void)
-{
-  int i;
-
-  if(!mutex_buf)
-    return 0;
-  CRYPTO_set_id_callback(NULL);
-  CRYPTO_set_locking_callback(NULL);
-  for(i = 0;  i < CRYPTO_num_locks();  i++)
-    MUTEX_CLEANUP(mutex_buf[i]);
-  free(mutex_buf);
-  mutex_buf = NULL;
-  return 1;
-}