1*699cd480SApple OSS Distributions /* 2*699cd480SApple OSS Distributions * Copyright (c) 1998-2019 Apple Inc. All rights reserved. 3*699cd480SApple OSS Distributions * 4*699cd480SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*699cd480SApple OSS Distributions * 6*699cd480SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*699cd480SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*699cd480SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*699cd480SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*699cd480SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*699cd480SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*699cd480SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*699cd480SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*699cd480SApple OSS Distributions * 15*699cd480SApple OSS Distributions * Please obtain a copy of the License at 16*699cd480SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*699cd480SApple OSS Distributions * 18*699cd480SApple OSS Distributions * The Original Code and all software distributed under the License are 19*699cd480SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*699cd480SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*699cd480SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*699cd480SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*699cd480SApple OSS Distributions * Please see the License for the specific language governing rights and 24*699cd480SApple OSS Distributions * limitations under the License. 25*699cd480SApple OSS Distributions * 26*699cd480SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*699cd480SApple OSS Distributions */ 28*699cd480SApple OSS Distributions /* Copyright (c) 1999 Apple Computer, Inc. All rights reserved. 29*699cd480SApple OSS Distributions * Copyright (c) 1994-1996 NeXT Software, Inc. All rights reserved. 30*699cd480SApple OSS Distributions */ 31*699cd480SApple OSS Distributions 32*699cd480SApple OSS Distributions #ifndef _IOKIT_IOCONDITIONLOCK_H 33*699cd480SApple OSS Distributions #define _IOKIT_IOCONDITIONLOCK_H 34*699cd480SApple OSS Distributions 35*699cd480SApple OSS Distributions #include <libkern/c++/OSPtr.h> 36*699cd480SApple OSS Distributions #include <libkern/c++/OSObject.h> 37*699cd480SApple OSS Distributions #include <IOKit/IOLib.h> 38*699cd480SApple OSS Distributions #include <IOKit/system.h> 39*699cd480SApple OSS Distributions 40*699cd480SApple OSS Distributions #include <IOKit/IOLocks.h> 41*699cd480SApple OSS Distributions 42*699cd480SApple OSS Distributions class IOConditionLock : public OSObject 43*699cd480SApple OSS Distributions { 44*699cd480SApple OSS Distributions OSDeclareDefaultStructors(IOConditionLock); 45*699cd480SApple OSS Distributions 46*699cd480SApple OSS Distributions private: 47*699cd480SApple OSS Distributions IOLock * cond_interlock; // condition var Simple lock 48*699cd480SApple OSS Distributions volatile int condition; 49*699cd480SApple OSS Distributions 50*699cd480SApple OSS Distributions IOLock * sleep_interlock; // sleep lock Simple lock 51*699cd480SApple OSS Distributions unsigned char interruptible; 52*699cd480SApple OSS Distributions volatile bool want_lock; 53*699cd480SApple OSS Distributions volatile bool waiting; 54*699cd480SApple OSS Distributions 55*699cd480SApple OSS Distributions public: 56*699cd480SApple OSS Distributions static OSPtr<IOConditionLock> withCondition(int condition, bool inIntr = true); 57*699cd480SApple OSS Distributions virtual bool initWithCondition(int condition, bool inIntr = true); 58*699cd480SApple OSS Distributions virtual void free() APPLE_KEXT_OVERRIDE; 59*699cd480SApple OSS Distributions 60*699cd480SApple OSS Distributions virtual bool tryLock(); // acquire lock, no waiting 61*699cd480SApple OSS Distributions virtual int lock(); // acquire lock (enter critical section) 62*699cd480SApple OSS Distributions virtual void unlock(); // release lock (leave critical section) 63*699cd480SApple OSS Distributions 64*699cd480SApple OSS Distributions virtual bool getInterruptible() const; 65*699cd480SApple OSS Distributions virtual int getCondition() const; 66*699cd480SApple OSS Distributions virtual int setCondition(int condition); 67*699cd480SApple OSS Distributions 68*699cd480SApple OSS Distributions virtual int lockWhen(int condition);// acquire lock when condition 69*699cd480SApple OSS Distributions virtual void unlockWith(int condition); // set condition & release lock 70*699cd480SApple OSS Distributions }; 71*699cd480SApple OSS Distributions 72*699cd480SApple OSS Distributions #endif /* _IOKIT_IOCONDITIONLOCK_H */ 73