src/dyldLock.cpp

/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
 *
 * Copyright (c) 2004-2012 Apple Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_LICENSE_HEADER_END@
 */

#include <pthread.h>

#include "dyldLock.h"


static pthread_mutex_t	sGlobalMutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER;

// <rdar://problem/6361143> Need a way to determine if a gdb call to dlopen() would block
int	__attribute__((visibility("hidden")))			_dyld_global_lock_held = 0;


LockHelper::LockHelper()
{
	dyldGlobalLockAcquire();
}

LockHelper::~LockHelper()
{
	dyldGlobalLockRelease();
}

void dyldGlobalLockAcquire()
{
	pthread_mutex_lock(&sGlobalMutex);
	++_dyld_global_lock_held;
}

void dyldGlobalLockRelease()
{
	--_dyld_global_lock_held;
	pthread_mutex_unlock(&sGlobalMutex);
}
Commit	Line	Data
	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
	31	static 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
	34	int __attribute__((visibility("hidden"))) _dyld_global_lock_held = 0;
	35
	36
	37	LockHelper::LockHelper()
	38	{
	39	dyldGlobalLockAcquire();
	40	}
	41
	42	LockHelper::~LockHelper()
	43	{
	44	dyldGlobalLockRelease();
	45	}
	46
	47	void dyldGlobalLockAcquire()
	48	{
	49	pthread_mutex_lock(&sGlobalMutex);
	50	++_dyld_global_lock_held;
	51	}
	52
	53	void dyldGlobalLockRelease()
	54	{
	55	--_dyld_global_lock_held;
	56	pthread_mutex_unlock(&sGlobalMutex);
	57	}
	58
	59