109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
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/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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/*
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File: IdleTask.h
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Contains: IdleTasks are identical to normal tasks (see task.h) with one exception:
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You can schedule them for timeouts. If you call SetIdleTimer
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on one, after the time has elapsed the task object will receive an
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OS_IDLE event.
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*/
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#ifndef _IDLETASK_H_
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#define _IDLETASK_H_
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#include "Task.h"
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#include "OSThread.h"
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#include "OSHeap.h"
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#include "OSMutex.h"
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#include "OSCond.h"
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class IdleTask;
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//merely a private implementation detail of IdleTask
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class IdleTaskThread : private OSThread
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{
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private:
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IdleTaskThread() : OSThread(), fHeapMutex() {}
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virtual ~IdleTaskThread() { Assert(fIdleHeap.CurrentHeapSize() == 0); }
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void SetIdleTimer(IdleTask *idleObj, SInt64 msec);
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void CancelTimeout(IdleTask *idleObj);
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virtual void Entry();
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OSHeap fIdleHeap;
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OSMutex fHeapMutex;
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OSCond fHeapCond;
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friend class IdleTask;
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};
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class IdleTask : public Task
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{
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public:
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//Call Initialize before using this class
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static void Initialize();
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IdleTask() : Task(), fIdleElem() { this->SetTaskName("IdleTask"); fIdleElem.SetEnclosingObject(this); }
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//This object does a "best effort" of making sure a timeout isn't
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//pending for an object being deleted. In other words, if there is
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//a timeout pending, and the destructor is called, things will get cleaned
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//up. But callers must ensure that SetIdleTimer isn't called at the same
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//time as the destructor, or all hell will break loose.
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virtual ~IdleTask();
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//SetIdleTimer:
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//This object will receive an OS_IDLE event in the following number of milliseconds.
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//Only one timeout can be outstanding, if there is already a timeout scheduled, this
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//does nothing.
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void SetIdleTimer(SInt64 msec) { sIdleThread->SetIdleTimer(this, msec); }
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//CancelTimeout
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//If there is a pending timeout for this object, this function cancels it.
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//If there is no pending timeout, this function does nothing.
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//Currently not supported because OSHeap doesn't support random remove
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void CancelTimeout() { sIdleThread->CancelTimeout(this); }
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private:
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OSHeapElem fIdleElem;
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//there is only one idle thread shared by all idle tasks.
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static IdleTaskThread* sIdleThread;
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friend class IdleTaskThread;
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};
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#endif
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