1/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
2 *
3 * Copyright (c) 2004-2012 Apple Inc. All rights reserved.
4 *
5 * @APPLE_LICENSE_HEADER_START@
6 *
7 * This file contains Original Code and/or Modifications of Original Code
8 * as defined in and that are subject to the Apple Public Source License
9 * Version 2.0 (the 'License'). You may not use this file except in
10 * compliance with the License. Please obtain a copy of the License at
11 * http://www.opensource.apple.com/apsl/ and read it before using this
12 * file.
13 *
14 * The Original Code and all software distributed under the License are
15 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
19 * Please see the License for the specific language governing rights and
20 * limitations under the License.
21 *
22 * @APPLE_LICENSE_HEADER_END@
23 */
24
25#include <pthread.h>
26
27#include "dyldLock.h"
28
29
30
31static pthread_mutex_t	sGlobalMutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER;
32
33// <rdar://problem/6361143> Need a way to determine if a gdb call to dlopen() would block
34int	__attribute__((visibility("hidden")))			_dyld_global_lock_held = 0;
35
36
37LockHelper::LockHelper()
38{
39	dyldGlobalLockAcquire();
40}
41
42LockHelper::~LockHelper()
43{
44	dyldGlobalLockRelease();
45}
46
47void dyldGlobalLockAcquire()
48{
49	pthread_mutex_lock(&sGlobalMutex);
50	++_dyld_global_lock_held;
51}
52
53void dyldGlobalLockRelease()
54{
55	--_dyld_global_lock_held;
56	pthread_mutex_unlock(&sGlobalMutex);
57}
58
59
60