1/* 2 * Copyright (c) 2002-2007 Apple Inc. All rights reserved. 3 * 4 * @APPLE_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. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23 24#ifndef __IOKIT_SCSI_PARALLEL_TIMER_H__ 25#define __IOKIT_SCSI_PARALLEL_TIMER_H__ 26 27 28//----------------------------------------------------------------------------- 29// Includes 30//----------------------------------------------------------------------------- 31 32// General IOKit includes 33#include <IOKit/IOWorkLoop.h> 34#include <IOKit/IOTimerEventSource.h> 35 36// SCSI Parallel Family includes 37#include "SCSIParallelTask.h" 38 39 40//----------------------------------------------------------------------------- 41// Constants 42//----------------------------------------------------------------------------- 43 44#define kTimeoutValueNone 0 45 46 47//----------------------------------------------------------------------------- 48// Class Declarations 49//----------------------------------------------------------------------------- 50 51class SCSIParallelTimer : public IOTimerEventSource 52{ 53 54 OSDeclareDefaultStructors ( SCSIParallelTimer ) 55 56public: 57 58 static SCSIParallelTimer * 59 CreateTimerEventSource ( OSObject * owner, Action action = 0 ); 60 61 bool Init ( OSObject * owner, Action action ); 62 63 void Enable ( void ); 64 void Disable ( void ); 65 void CancelTimeout ( void ); 66 bool Rearm ( void ); 67 void BeginTimeoutContext ( void ); 68 void EndTimeoutContext ( void ); 69 70 IOReturn SetTimeout ( 71 SCSIParallelTaskIdentifier taskIdentifier, 72 UInt32 timeoutInMS = kTimeoutValueNone ); 73 74 void RemoveTask ( 75 SCSIParallelTaskIdentifier taskIdentifier ); 76 77 SCSIParallelTaskIdentifier GetExpiredTask ( void ); 78 79 80protected: 81 82 inline static SInt32 CompareDeadlines ( AbsoluteTime time1, AbsoluteTime time2 ); 83 AbsoluteTime GetDeadline ( SCSIParallelTask * task ); 84 UInt32 GetTimeoutDuration ( SCSIParallelTask * task ); 85 86 87private: 88 89 queue_head_t fListHead; 90 bool fHandlingTimeout; 91 92}; 93 94 95#endif /* __IOKIT_SCSI_PARALLEL_TIMER_H__ */