/*
* Copyright (c) 1998-2019 Apple 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++/OSPtr.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 OSPtr<IOConditionLock> withCondition(int condition, bool inIntr = true);
virtual bool initWithCondition(int condition, bool inIntr = true);
virtual void free() APPLE_KEXT_OVERRIDE;
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 */