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Annotation of XNU/iokit/IOKit/IOConditionLock.h, revision 1.1.1.1

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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