/* * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_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. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * 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_OSREFERENCE_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 */