/* * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This 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 OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * Copyright (c) 1994-1996 NeXT Software, Inc. All rights reserved. */ #ifndef _IOKIT_IOCONDITIONLOCK_H #define _IOKIT_IOCONDITIONLOCK_H #include <libkern/c++/OSObject.h> #include <IOKit/IOLib.h> #include <IOKit/system.h> #include <IOKit/IOLocks.h> class IOConditionLock : public OSObject { OSDeclareDefaultStructors(IOConditionLock) private: IOLock * cond_interlock; // condition var Simple lock volatile int condition; IOLock * sleep_interlock; // sleep lock Simple lock unsigned char interruptible; volatile bool want_lock; volatile bool waiting; public: static IOConditionLock *withCondition(int condition, bool inIntr = true); virtual bool initWithCondition(int condition, bool inIntr = true); virtual void free(); virtual bool tryLock(); // acquire lock, no waiting virtual int lock(); // acquire lock (enter critical section) virtual void unlock(); // release lock (leave critical section) virtual bool getInterruptible() const; virtual int getCondition() const; virtual int setCondition(int condition); virtual int lockWhen(int condition); // acquire lock when condition virtual void unlockWith(int condition); // set condition & release lock }; #endif /* _IOKIT_IOCONDITIONLOCK_H */