FreeBSD/Linux Kernel Cross Reference
sys/iokit/IOKit/IOConditionLock.h

     /*
      * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
      * Version 2.0 (the 'License'). You may not use this file except in
      * compliance with the License. The rights granted to you under the License
     * may not be used to create, or enable the creation or redistribution of,
     * unlawful or unlicensed copies of an Apple operating system, or to
     * circumvent, violate, or enable the circumvention or violation of, any
     * terms of an Apple operating system software license agreement.
     * 
     * Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
     */
    /* Copyright (c) 1999 Apple Computer, Inc.  All rights reserved.
     * Copyright (c) 1994-1996 NeXT Software, Inc.  All rights reserved. 
     */
    
    #ifndef _IOKIT_IOCONDITIONLOCK_H
    #define _IOKIT_IOCONDITIONLOCK_H
    
    #include <libkern/c++/OSObject.h>
    #include <IOKit/IOLib.h>
    #include <IOKit/system.h>
    
    #include <IOKit/IOLocks.h>
    
    class IOConditionLock : public OSObject
    {
        OSDeclareDefaultStructors(IOConditionLock)
    
    private:
        IOLock *            cond_interlock;         // condition var Simple lock
        volatile int        condition;
    
        IOLock *            sleep_interlock;        // sleep lock Simple lock
        unsigned char       interruptible;
        volatile bool       want_lock;
        volatile bool       waiting;
    
    public:
        static IOConditionLock *withCondition(int condition, bool inIntr = true);
        virtual bool initWithCondition(int condition, bool inIntr = true);
        virtual void free();
    
        virtual bool tryLock();     // acquire lock, no waiting
        virtual int  lock();        // acquire lock (enter critical section)
        virtual void unlock();      // release lock (leave critical section)
    
        virtual bool getInterruptible() const;
        virtual int  getCondition() const;
        virtual int  setCondition(int condition);
    
        virtual int  lockWhen(int condition); // acquire lock when condition
        virtual void unlockWith(int condition); // set condition & release lock
    };
    
    #endif /* _IOKIT_IOCONDITIONLOCK_H */

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