/* -*- 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@ */ #ifndef __DYLDLOCK__ #define __DYLDLOCK__ // // This file contains the synchronization utilities used to make dyld APIs be thread safe. // // The implementation of all dyld API's must hold acquire global lock (in libSystem) // before calling into dyld proper, and release the lock after returning from dyld. // This is done using the macros DYLD_LOCK_THIS_BLOCK. // Example: // // void dyld_api() { // DYLD_LOCK_THIS_BLOCK; // // free to do stuff here // // that accesses dyld internal data structures // } // // void dyld_api_state_free() { // DYLD_NO_LOCK_THIS_BLOCK // // can only do stuff here // // that does not require locking // } // #define DYLD_LOCK_THIS_BLOCK LockHelper _dyld_lock; #define DYLD_NO_LOCK_THIS_BLOCK // used by dyld wrapper functions in libSystem class __attribute__((visibility("hidden"))) LockHelper { public: LockHelper(); ~LockHelper(); }; // to initialize extern void dyldGlobalLockInitialize() __attribute__((visibility("hidden"))); extern void dyldGlobalLockAcquire() __attribute__((visibility("hidden"))); extern void dyldGlobalLockRelease() __attribute__((visibility("hidden"))); #endif // __DYLDLOCK__