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Annotation of XNU/iokit/IOKit/IOConditionLock.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* Copyright (c) 1999 Apple Computer, Inc.  All rights reserved.
        !            23:  * Copyright (c) 1994-1996 NeXT Software, Inc.  All rights reserved. 
        !            24:  */
        !            25: 
        !            26: #ifndef _IOKIT_IOCONDITIONLOCK_H
        !            27: #define _IOKIT_IOCONDITIONLOCK_H
        !            28: 
        !            29: #include <libkern/c++/OSObject.h>
        !            30: #include <IOKit/IOLib.h>
        !            31: #include <IOKit/system.h>
        !            32: 
        !            33: #include <IOKit/IOLocks.h>
        !            34: 
        !            35: class IOConditionLock : public OSObject
        !            36: {
        !            37:     OSDeclareDefaultStructors(IOConditionLock)
        !            38: 
        !            39: private:
        !            40:     IOLock *           cond_interlock;         // condition var Simple lock
        !            41:     volatile int       condition;
        !            42: 
        !            43:     IOLock *           sleep_interlock;        // sleep lock Simple lock
        !            44:     unsigned char      interruptible;
        !            45:     volatile bool      want_lock;
        !            46:     volatile bool      waiting;
        !            47: 
        !            48: public:
        !            49:     static IOConditionLock *withCondition(int condition, bool inIntr = true);
        !            50:     virtual bool initWithCondition(int condition, bool inIntr = true);
        !            51:     virtual void free();
        !            52: 
        !            53:     virtual bool tryLock();    // acquire lock, no waiting
        !            54:     virtual int  lock();       // acquire lock (enter critical section)
        !            55:     virtual void unlock();     // release lock (leave critical section)
        !            56: 
        !            57:     virtual bool getInterruptible() const;
        !            58:     virtual int  getCondition() const;
        !            59:     virtual int  setCondition(int condition);
        !            60: 
        !            61:     virtual int  lockWhen(int condition); // acquire lock when condition
        !            62:     virtual void unlockWith(int condition); // set condition & release lock
        !            63: };
        !            64: 
        !            65: #endif /* _IOKIT_IOCONDITIONLOCK_H */

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