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