1 | /* |
2 | * Copyright (c) 1998-2000 Apple Computer, 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, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* Copyright (c) 1999 Apple Computer, Inc. All rights reserved. |
29 | * Copyright (c) 1994-1996 NeXT Software, Inc. All rights reserved. |
30 | */ |
31 | |
32 | #ifndef _IOKIT_IOCONDITIONLOCK_H |
33 | #define _IOKIT_IOCONDITIONLOCK_H |
34 | |
35 | #include <libkern/c++/OSObject.h> |
36 | #include <IOKit/IOLib.h> |
37 | #include <IOKit/system.h> |
38 | |
39 | #include <IOKit/IOLocks.h> |
40 | |
41 | class IOConditionLock : public OSObject |
42 | { |
43 | OSDeclareDefaultStructors(IOConditionLock) |
44 | |
45 | private: |
46 | IOLock * cond_interlock; // condition var Simple lock |
47 | volatile int condition; |
48 | |
49 | IOLock * sleep_interlock; // sleep lock Simple lock |
50 | unsigned char interruptible; |
51 | volatile bool want_lock; |
52 | volatile bool waiting; |
53 | |
54 | public: |
55 | static IOConditionLock *withCondition(int condition, bool inIntr = true); |
56 | virtual bool initWithCondition(int condition, bool inIntr = true); |
57 | virtual void free() APPLE_KEXT_OVERRIDE; |
58 | |
59 | virtual bool tryLock(); // acquire lock, no waiting |
60 | virtual int lock(); // acquire lock (enter critical section) |
61 | virtual void unlock(); // release lock (leave critical section) |
62 | |
63 | virtual bool getInterruptible() const; |
64 | virtual int getCondition() const; |
65 | virtual int setCondition(int condition); |
66 | |
67 | virtual int lockWhen(int condition); // acquire lock when condition |
68 | virtual void unlockWith(int condition); // set condition & release lock |
69 | }; |
70 | |
71 | #endif /* _IOKIT_IOCONDITIONLOCK_H */ |
72 | |