1 /* 2 * Copyright (c) 1998-2019 Apple 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 #ifndef _IOSYNCER_H 29 #define _IOSYNCER_H 30 31 #include <libkern/c++/OSObject.h> 32 #include <IOKit/IOTypes.h> 33 #include <IOKit/IOLocks.h> 34 35 class IOSyncer : public OSObject 36 { 37 OSDeclareDefaultStructors(IOSyncer); 38 39 private: 40 // The spin lock that is used to guard the 'threadMustStop' variable. 41 IOSimpleLock *guardLock; 42 volatile bool threadMustStop; 43 IOReturn fResult; 44 virtual void free() APPLE_KEXT_OVERRIDE; 45 virtual void privateSignal(); 46 47 public: 48 49 static IOSyncer * create(bool twoRetains = true) 50 APPLE_KEXT_DEPRECATED; 51 52 virtual bool init(bool twoRetains) 53 APPLE_KEXT_DEPRECATED; 54 virtual void reinit() 55 APPLE_KEXT_DEPRECATED; 56 virtual IOReturn wait(bool autoRelease = true) 57 APPLE_KEXT_DEPRECATED; 58 virtual void signal(IOReturn res = kIOReturnSuccess, 59 bool autoRelease = true) 60 APPLE_KEXT_DEPRECATED; 61 }; 62 63 #endif /* !_IOSYNCER */ 64