gecko-dev/xpcom/threads/nsTimerImpl.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <pavlov@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsTimerImpl_h___
#define nsTimerImpl_h___
//#define FORCE_PR_LOG /* Allow logging in the release build */
#include "nsITimer.h"
#include "nsIEventTarget.h"
#include "nsIObserver.h"
#include "nsCOMPtr.h"
#include "prlog.h"
#include "mozilla/TimeStamp.h"
#if defined(PR_LOGGING)
static PRLogModuleInfo *gTimerLog = PR_NewLogModule("nsTimerImpl");
#define DEBUG_TIMERS 1
#else
#undef DEBUG_TIMERS
#endif
#define NS_TIMER_CLASSNAME "Timer"
#define NS_TIMER_CID \
{ /* 5ff24248-1dd2-11b2-8427-fbab44f29bc8 */ \
0x5ff24248, \
0x1dd2, \
0x11b2, \
{0x84, 0x27, 0xfb, 0xab, 0x44, 0xf2, 0x9b, 0xc8} \
}
enum {
CALLBACK_TYPE_UNKNOWN = 0,
CALLBACK_TYPE_INTERFACE = 1,
CALLBACK_TYPE_FUNC = 2,
CALLBACK_TYPE_OBSERVER = 3
};
class nsTimerImpl : public nsITimer
{
public:
typedef mozilla::TimeStamp TimeStamp;
nsTimerImpl();
static NS_HIDDEN_(nsresult) Startup();
static NS_HIDDEN_(void) Shutdown();
friend class TimerThread;
void Fire();
nsresult PostTimerEvent();
void SetDelayInternal(PRUint32 aDelay);
NS_DECL_ISUPPORTS
NS_DECL_NSITIMER
PRInt32 GetGeneration() { return mGeneration; }
private:
~nsTimerImpl();
nsresult InitCommon(PRUint32 aType, PRUint32 aDelay);
void ReleaseCallback()
{
// if we're the last owner of the callback object, make
// sure that we don't recurse into ReleaseCallback in case
// the callback's destructor calls Cancel() or similar.
PRUint8 cbType = mCallbackType;
mCallbackType = CALLBACK_TYPE_UNKNOWN;
if (cbType == CALLBACK_TYPE_INTERFACE)
NS_RELEASE(mCallback.i);
else if (cbType == CALLBACK_TYPE_OBSERVER)
NS_RELEASE(mCallback.o);
}
bool IsRepeating() const {
PR_STATIC_ASSERT(TYPE_ONE_SHOT < TYPE_REPEATING_SLACK);
PR_STATIC_ASSERT(TYPE_REPEATING_SLACK < TYPE_REPEATING_PRECISE);
PR_STATIC_ASSERT(TYPE_REPEATING_PRECISE < TYPE_REPEATING_PRECISE_CAN_SKIP);
return mType >= TYPE_REPEATING_SLACK;
}
bool IsRepeatingPrecisely() const {
return mType >= TYPE_REPEATING_PRECISE;
}
nsCOMPtr<nsIEventTarget> mEventTarget;
void * mClosure;
union CallbackUnion {
nsTimerCallbackFunc c;
nsITimerCallback * i;
nsIObserver * o;
} mCallback;
// Some callers expect to be able to access the callback while the
// timer is firing.
nsCOMPtr<nsITimerCallback> mTimerCallbackWhileFiring;
// These members are set by Init (called from NS_NewTimer) and never reset.
PRUint8 mCallbackType;
// These members are set by the initiating thread, when the timer's type is
// changed and during the period where it fires on that thread.
PRUint8 mType;
bool mFiring;
// Use a bool (int) here to isolate loads and stores of these two members
// done on various threads under the protection of TimerThread::mLock, from
// loads and stores done on the initiating/type-changing/timer-firing thread
// to the above PRUint8/bool members.
bool mArmed;
bool mCanceled;
// The generation number of this timer, re-generated each time the timer is
// initialized so one-shot timers can be canceled and re-initialized by the
// arming thread without any bad race conditions.
PRInt32 mGeneration;
PRUint32 mDelay;
TimeStamp mTimeout;
#ifdef DEBUG_TIMERS
TimeStamp mStart, mStart2;
static double sDeltaSum;
static double sDeltaSumSquared;
static double sDeltaNum;
#endif
};
#endif /* nsTimerImpl_h___ */