1  /*
 2   * Copyright (c) 1998-2019 Apple Inc. All rights reserved.
 3   *
 4   * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 5   *
 6   * This file contains Original Code and/or Modifications of Original Code
 7   * as defined in and that are subject to the Apple Public Source License
 8   * Version 2.0 (the 'License'). You may not use this file except in
 9   * compliance with the License. The rights granted to you under the License
10   * may not be used to create, or enable the creation or redistribution of,
11   * unlawful or unlicensed copies of an Apple operating system, or to
12   * circumvent, violate, or enable the circumvention or violation of, any
13   * terms of an Apple operating system software license agreement.
14   *
15   * Please obtain a copy of the License at
16   * http://www.opensource.apple.com/apsl/ and read it before using this file.
17   *
18   * The Original Code and all software distributed under the License are
19   * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20   * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21   * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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23   * Please see the License for the specific language governing rights and
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26   * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27   */
28  #ifndef _IOSYNCER_H
29  #define _IOSYNCER_H
30  
31  #include <libkern/c++/OSObject.h>
32  #include <IOKit/IOTypes.h>
33  #include <IOKit/IOLocks.h>
34  
35  class IOSyncer : public OSObject
36  {
37  	OSDeclareDefaultStructors(IOSyncer);
38  
39  private:
40  // The spin lock that is used to guard the 'threadMustStop' variable.
41  	IOSimpleLock *guardLock;
42  	volatile bool threadMustStop;
43  	IOReturn fResult;
44  	virtual void free() APPLE_KEXT_OVERRIDE;
45  	virtual void privateSignal();
46  
47  public:
48  
49  	static IOSyncer * create(bool twoRetains = true)
50  	APPLE_KEXT_DEPRECATED;
51  
52  	virtual bool init(bool twoRetains)
53  	APPLE_KEXT_DEPRECATED;
54  	virtual void reinit()
55  	APPLE_KEXT_DEPRECATED;
56  	virtual IOReturn wait(bool autoRelease = true)
57  	APPLE_KEXT_DEPRECATED;
58  	virtual void signal(IOReturn res = kIOReturnSuccess,
59  	    bool autoRelease = true)
60  	APPLE_KEXT_DEPRECATED;
61  };
62  
63  #endif /* !_IOSYNCER */