125 lines
3.7 KiB
C++
125 lines
3.7 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.cpp
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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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#include "IdleTask.h"
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#include "OSMemory.h"
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#include "OS.h"
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//IDLETASKTHREAD IMPLEMENTATION:
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IdleTaskThread* IdleTask::sIdleThread = NULL;
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void IdleTaskThread::SetIdleTimer(IdleTask *activeObj, SInt64 msec)
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{
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//note: OSHeap doesn't support a random remove, so this function
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//won't change the timeout value if there is already one set
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if (activeObj->fIdleElem.IsMemberOfAnyHeap())
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return;
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activeObj->fIdleElem.SetValue(OS::Milliseconds() + msec);
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{
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OSMutexLocker locker(&fHeapMutex);
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fIdleHeap.Insert(&activeObj->fIdleElem);
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}
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fHeapCond.Signal();
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}
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void IdleTaskThread::CancelTimeout(IdleTask* idleObj)
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{
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Assert(idleObj != NULL);
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OSMutexLocker locker(&fHeapMutex);
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fIdleHeap.Remove(&idleObj->fIdleElem);
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}
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void
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IdleTaskThread::Entry()
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{
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OSMutexLocker locker(&fHeapMutex);
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while (true)
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{
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//if there are no events to process, block.
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if (fIdleHeap.CurrentHeapSize() == 0)
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fHeapCond.Wait(&fHeapMutex);
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SInt64 msec = OS::Milliseconds();
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//pop elements out of the heap as long as their timeout time has arrived
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while ((fIdleHeap.CurrentHeapSize() > 0) && (fIdleHeap.PeekMin()->GetValue() <= msec))
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{
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IdleTask* elem = (IdleTask*)fIdleHeap.ExtractMin()->GetEnclosingObject();
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Assert(elem != NULL);
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elem->Signal(Task::kIdleEvent);
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}
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//we are done sending idle events. If there is a lowest tick count, then
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//we need to sleep until that time.
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if (fIdleHeap.CurrentHeapSize() > 0)
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{
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SInt64 timeoutTime = fIdleHeap.PeekMin()->GetValue();
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//because sleep takes a 32 bit number
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timeoutTime -= msec;
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Assert(timeoutTime > 0);
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UInt32 smallTime = (UInt32)timeoutTime;
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fHeapCond.Wait(&fHeapMutex, smallTime);
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}
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}
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}
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void IdleTask::Initialize()
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{
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if (sIdleThread == NULL)
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{
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sIdleThread = NEW IdleTaskThread();
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sIdleThread->Start();
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}
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}
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IdleTask::~IdleTask()
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{
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//clean up stuff used by idle thread routines
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Assert(sIdleThread != NULL);
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OSMutexLocker locker(&sIdleThread->fHeapMutex);
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//Check to see if there is a pending timeout. If so, get this object
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//out of the heap
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if (fIdleElem.IsMemberOfAnyHeap())
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sIdleThread->CancelTimeout(this);
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}
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