xnu-344.49.tar.gz

[apple/xnu.git] / iokit / IOKit / IOSyncer.h

/*
 * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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
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 * @APPLE_LICENSE_HEADER_END@
 */
#ifndef _IOSYNCER_H
#define _IOSYNCER_H

#include <libkern/c++/OSObject.h>
#include <IOKit/IOTypes.h>
#include <IOKit/IOLocks.h>

class IOSyncer : public OSObject
{
    OSDeclareDefaultStructors(IOSyncer)

private:
    // The spin lock that is used to guard the 'threadMustStop' variable. 
    IOSimpleLock *guardLock;
    volatile bool threadMustStop;
    IOReturn fResult;
    virtual void free();
    virtual void privateSignal();

public:

    static IOSyncer * create(bool twoRetains = true);

    virtual bool init(bool twoRetains);
    virtual void reinit();
    virtual IOReturn wait(bool autoRelease = true);
    virtual void signal(IOReturn res = kIOReturnSuccess,
					bool autoRelease = true);
};

#endif /* !_IOSYNCER */