| 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 | |
