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sfraser%netscape.com
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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*/
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//
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// Mac implementation of the nsITimer interface
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//
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#include "nsITimer.h"
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#include "nsITimerCallback.h"
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#include "prlog.h"
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#include "nsRepeater.h"
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#include <list.h>
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#include <Events.h>
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#pragma mark class TimerImpl
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//========================================================================================
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class TimerImpl : public nsITimer
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// TimerImpl implements nsITimer API
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//========================================================================================
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{
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friend class TimerPeriodical;
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private:
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nsTimerCallbackFunc mCallbackFunc;
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nsITimerCallback * mCallbackObject;
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void * mClosure;
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PRUint32 mDelay;
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PRUint32 mFireTime; // Timer should fire when TickCount >= this number
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TimerImpl * mPrev;
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TimerImpl * mNext;
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public:
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// constructors
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TimerImpl();
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virtual ~TimerImpl();
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NS_DECL_ISUPPORTS
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PRUint32 GetFireTime() const { return mFireTime; }
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void Fire();
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// nsITimer overrides
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virtual nsresult Init(nsTimerCallbackFunc aFunc,
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void *aClosure,
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PRUint32 aDelay,
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PRUint32 aPriority = NS_PRIORITY_NORMAL,
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PRUint32 aType = NS_TYPE_ONE_SHOT
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);
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virtual nsresult Init(nsITimerCallback *aCallback,
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PRUint32 aDelay,
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PRUint32 aPriority = NS_PRIORITY_NORMAL,
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PRUint32 aType = NS_TYPE_ONE_SHOT
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);
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virtual void Cancel();
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virtual PRUint32 GetDelay();
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virtual void SetDelay(PRUint32 aDelay);
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virtual PRUint32 GetPriority() {};
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virtual void SetPriority(PRUint32 aPriority) {};
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virtual PRUint32 GetType() {};
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virtual void SetType(PRUint32 aType) {};
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virtual void* GetClosure();
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#if DEBUG
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enum {
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eGoodTimerSignature = 'Barf',
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eDeletedTimerSignature = 'oops'
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};
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Boolean IsGoodTimer() const { return (mSignature == eGoodTimerSignature); }
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#endif
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private:
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// Calculates mFireTime too
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void SetDelaySelf( PRUint32 aDelay );
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#if DEBUG
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UInt32 mSignature;
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#endif
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};
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#pragma mark class TimerPeriodical
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//========================================================================================
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class TimerPeriodical : public Repeater
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// TimerPeriodical is a singleton Repeater subclass that fires
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// off TimerImpl. The firing is done on idle.
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//========================================================================================
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{
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static TimerPeriodical * gPeriodical;
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TimerImpl* mTimers;
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public:
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// Returns the singleton instance
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static TimerPeriodical * GetPeriodical();
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TimerPeriodical();
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virtual ~TimerPeriodical();
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virtual void RepeatAction( const EventRecord &inMacEvent);
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nsresult AddTimer( TimerImpl * aTimer);
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nsresult RemoveTimer( TimerImpl * aTimer);
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};
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//========================================================================================
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// TimerImpl implementation
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//========================================================================================
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NS_IMPL_ISUPPORTS(TimerImpl, NS_GET_IID(nsITimer))
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//----------------------------------------------------------------------------------------
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TimerImpl::TimerImpl()
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//----------------------------------------------------------------------------------------
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: mCallbackFunc(nsnull)
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, mCallbackObject(nsnull)
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, mClosure(nsnull)
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, mDelay(0)
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, mFireTime(0)
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, mPrev(nsnull)
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, mNext(nsnull)
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#if DEBUG
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, mSignature(eGoodTimerSignature)
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#endif
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{
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NS_INIT_REFCNT();
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}
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//----------------------------------------------------------------------------------------
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TimerImpl::~TimerImpl()
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//----------------------------------------------------------------------------------------
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{
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Cancel();
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NS_IF_RELEASE(mCallbackObject);
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#if DEBUG
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mSignature = eDeletedTimerSignature;
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#endif
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}
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//----------------------------------------------------------------------------------------
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nsresult TimerImpl::Init(nsTimerCallbackFunc aFunc,
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void *aClosure,
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PRUint32 aDelay,
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PRUint32 aPriority,
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PRUint32 aType
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)
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//----------------------------------------------------------------------------------------
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{
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mCallbackFunc = aFunc;
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mClosure = aClosure;
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SetDelaySelf(aDelay);
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return TimerPeriodical::GetPeriodical()->AddTimer(this);
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}
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//----------------------------------------------------------------------------------------
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nsresult TimerImpl::Init(nsITimerCallback *aCallback,
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PRUint32 aDelay,
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PRUint32 aPriority,
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PRUint32 aType
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)
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//----------------------------------------------------------------------------------------
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{
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NS_ADDREF(aCallback);
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mCallbackObject = aCallback;
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SetDelaySelf(aDelay);
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return TimerPeriodical::GetPeriodical()->AddTimer(this);
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}
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//----------------------------------------------------------------------------------------
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void TimerImpl::Cancel()
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//----------------------------------------------------------------------------------------
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{
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TimerPeriodical::GetPeriodical()->RemoveTimer(this);
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}
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//----------------------------------------------------------------------------------------
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PRUint32 TimerImpl::GetDelay()
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//----------------------------------------------------------------------------------------
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{
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return mDelay;
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}
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//----------------------------------------------------------------------------------------
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void TimerImpl::SetDelay(PRUint32 aDelay)
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//----------------------------------------------------------------------------------------
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{
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SetDelaySelf(aDelay);
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}
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//----------------------------------------------------------------------------------------
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void* TimerImpl::GetClosure()
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//----------------------------------------------------------------------------------------
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{
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return mClosure;
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}
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//----------------------------------------------------------------------------------------
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void TimerImpl::Fire()
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//----------------------------------------------------------------------------------------
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{
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NS_PRECONDITION(mRefCnt > 0, "Firing a disposed Timer!");
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if (mCallbackFunc != NULL) {
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(*mCallbackFunc)(this, mClosure);
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}
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else if (mCallbackObject != NULL) {
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mCallbackObject->Notify(this); // Fire the timer
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}
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}
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//----------------------------------------------------------------------------------------
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void TimerImpl::SetDelaySelf( PRUint32 aDelay )
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//----------------------------------------------------------------------------------------
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{
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mDelay = aDelay;
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mFireTime = TickCount() + (mDelay * 3) / 50; // We need mFireTime in ticks (1/60th)
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// but aDelay is in 1000th (60/1000 = 3/50)
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}
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TimerPeriodical * TimerPeriodical::gPeriodical = nsnull;
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TimerPeriodical * TimerPeriodical::GetPeriodical()
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{
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if (gPeriodical == NULL)
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gPeriodical = new TimerPeriodical();
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return gPeriodical;
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}
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TimerPeriodical::TimerPeriodical()
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{
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mTimers = nsnull;
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}
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TimerPeriodical::~TimerPeriodical()
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{
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PR_ASSERT(mTimers == 0);
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}
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nsresult TimerPeriodical::AddTimer( TimerImpl * aTimer)
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{
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// make sure it's not already there
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RemoveTimer(aTimer);
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// keep list sorted by fire time
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if (mTimers)
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{
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if (aTimer->GetFireTime() < mTimers->GetFireTime())
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{
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mTimers->mPrev = aTimer;
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aTimer->mNext = mTimers;
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mTimers = aTimer;
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}
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else
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{
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TimerImpl *t = mTimers;
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TimerImpl *prevt;
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// we know we will enter the while loop at least the first
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// time, and thus prevt will be initialized
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while (t && (t->GetFireTime() <= aTimer->GetFireTime()))
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{
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prevt = t;
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t = t->mNext;
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}
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aTimer->mPrev = prevt;
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aTimer->mNext = prevt->mNext;
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prevt->mNext = aTimer;
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if (aTimer->mNext) aTimer->mNext->mPrev = aTimer;
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}
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}
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else mTimers = aTimer;
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StartRepeating();
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return NS_OK;
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}
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nsresult TimerPeriodical::RemoveTimer( TimerImpl * aTimer)
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{
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TimerImpl* t = mTimers;
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TimerImpl* next_t = nsnull;
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if (t) next_t = t->mNext;
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while (t)
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{
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if (t == aTimer)
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{
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if (mTimers == t) mTimers = t->mNext;
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if (t->mPrev) t->mPrev->mNext = t->mNext;
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if (t->mNext) t->mNext->mPrev = t->mPrev;
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t->mNext = nsnull;
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t->mPrev = nsnull;
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}
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t = next_t;
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if (t) next_t = t->mNext;
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}
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if ( mTimers == nsnull )
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StopRepeating();
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return NS_OK;
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}
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// Called through every event loop
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// Loops through the list of available timers, and
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// fires off the appropriate ones
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void TimerPeriodical::RepeatAction( const EventRecord &inMacEvent)
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{
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PRBool done = false;
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while (!done)
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{
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TimerImpl* t = mTimers;
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while (t)
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{
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NS_ASSERTION(t->IsGoodTimer(), "Bad timer!");
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if (t->GetFireTime() <= inMacEvent.when)
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{
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RemoveTimer(t);
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t->Fire();
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break;
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}
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t = t->mNext;
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}
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done = true;
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}
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}
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PR_PUBLIC_API(nsresult) NS_NewTimer(nsITimer** aInstancePtrResult)
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{
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NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
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if (nsnull == aInstancePtrResult) {
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return NS_ERROR_NULL_POINTER;
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}
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TimerImpl *timer = new TimerImpl();
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if (nsnull == timer) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return timer->QueryInterface(NS_GET_IID(nsITimer), (void **) aInstancePtrResult);
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}
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