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Source at commit 2740 created 8 years 11 months ago. By ifabio, sync with trunk. | |
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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();␊ |
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 |