зеркало из https://github.com/mozilla/pjs.git
609 строки
18 KiB
C++
609 строки
18 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Stuart Parmenter <pavlov@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsTimerImpl.h"
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#include "TimerThread.h"
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#include "nsAutoPtr.h"
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#include "nsThreadManager.h"
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#include "nsThreadUtils.h"
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#include "prmem.h"
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#include "sampler.h"
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using mozilla::TimeDuration;
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using mozilla::TimeStamp;
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static PRInt32 gGenerator = 0;
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static TimerThread* gThread = nsnull;
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#ifdef DEBUG_TIMERS
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#include <math.h>
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double nsTimerImpl::sDeltaSumSquared = 0;
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double nsTimerImpl::sDeltaSum = 0;
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double nsTimerImpl::sDeltaNum = 0;
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static void
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myNS_MeanAndStdDev(double n, double sumOfValues, double sumOfSquaredValues,
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double *meanResult, double *stdDevResult)
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{
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double mean = 0.0, var = 0.0, stdDev = 0.0;
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if (n > 0.0 && sumOfValues >= 0) {
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mean = sumOfValues / n;
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double temp = (n * sumOfSquaredValues) - (sumOfValues * sumOfValues);
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if (temp < 0.0 || n <= 1)
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var = 0.0;
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else
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var = temp / (n * (n - 1));
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// for some reason, Windows says sqrt(0.0) is "-1.#J" (?!) so do this:
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stdDev = var != 0.0 ? sqrt(var) : 0.0;
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}
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*meanResult = mean;
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*stdDevResult = stdDev;
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}
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#endif
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NS_IMPL_THREADSAFE_QUERY_INTERFACE1(nsTimerImpl, nsITimer)
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NS_IMPL_THREADSAFE_ADDREF(nsTimerImpl)
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NS_IMETHODIMP_(nsrefcnt) nsTimerImpl::Release(void)
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{
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nsrefcnt count;
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NS_PRECONDITION(0 != mRefCnt, "dup release");
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count = NS_AtomicDecrementRefcnt(mRefCnt);
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NS_LOG_RELEASE(this, count, "nsTimerImpl");
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if (count == 0) {
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mRefCnt = 1; /* stabilize */
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/* enable this to find non-threadsafe destructors: */
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/* NS_ASSERT_OWNINGTHREAD(nsTimerImpl); */
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delete this;
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return 0;
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}
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// If only one reference remains, and mArmed is set, then the ref must be
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// from the TimerThread::mTimers array, so we Cancel this timer to remove
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// the mTimers element, and return 0 if Cancel in fact disarmed the timer.
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//
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// We use an inlined version of nsTimerImpl::Cancel here to check for the
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// NS_ERROR_NOT_AVAILABLE code returned by gThread->RemoveTimer when this
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// timer is not found in the mTimers array -- i.e., when the timer was not
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// in fact armed once we acquired TimerThread::mLock, in spite of mArmed
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// being true here. That can happen if the armed timer is being fired by
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// TimerThread::Run as we race and test mArmed just before it is cleared by
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// the timer thread. If the RemoveTimer call below doesn't find this timer
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// in the mTimers array, then the last ref to this timer is held manually
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// and temporarily by the TimerThread, so we should fall through to the
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// final return and return 1, not 0.
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//
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// The original version of this thread-based timer code kept weak refs from
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// TimerThread::mTimers, removing this timer's weak ref in the destructor,
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// but that leads to double-destructions in the race described above, and
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// adding mArmed doesn't help, because destructors can't be deferred, once
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// begun. But by combining reference-counting and a specialized Release
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// method with "is this timer still in the mTimers array once we acquire
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// the TimerThread's lock" testing, we defer destruction until we're sure
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// that only one thread has its hot little hands on this timer.
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//
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// Note that both approaches preclude a timer creator, and everyone else
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// except the TimerThread who might have a strong ref, from dropping all
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// their strong refs without implicitly canceling the timer. Timers need
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// non-mTimers-element strong refs to stay alive.
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if (count == 1 && mArmed) {
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mCanceled = true;
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NS_ASSERTION(gThread, "An armed timer exists after the thread timer stopped.");
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if (NS_SUCCEEDED(gThread->RemoveTimer(this)))
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return 0;
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}
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return count;
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}
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nsTimerImpl::nsTimerImpl() :
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mClosure(nsnull),
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mCallbackType(CALLBACK_TYPE_UNKNOWN),
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mFiring(false),
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mArmed(false),
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mCanceled(false),
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mGeneration(0),
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mDelay(0)
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{
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// XXXbsmedberg: shouldn't this be in Init()?
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mEventTarget = static_cast<nsIEventTarget*>(NS_GetCurrentThread());
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mCallback.c = nsnull;
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}
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nsTimerImpl::~nsTimerImpl()
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{
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ReleaseCallback();
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}
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//static
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nsresult
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nsTimerImpl::Startup()
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{
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nsresult rv;
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gThread = new TimerThread();
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if (!gThread) return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(gThread);
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rv = gThread->InitLocks();
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if (NS_FAILED(rv)) {
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NS_RELEASE(gThread);
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}
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return rv;
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}
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void nsTimerImpl::Shutdown()
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{
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#ifdef DEBUG_TIMERS
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if (PR_LOG_TEST(gTimerLog, PR_LOG_DEBUG)) {
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double mean = 0, stddev = 0;
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myNS_MeanAndStdDev(sDeltaNum, sDeltaSum, sDeltaSumSquared, &mean, &stddev);
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PR_LOG(gTimerLog, PR_LOG_DEBUG, ("sDeltaNum = %f, sDeltaSum = %f, sDeltaSumSquared = %f\n", sDeltaNum, sDeltaSum, sDeltaSumSquared));
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PR_LOG(gTimerLog, PR_LOG_DEBUG, ("mean: %fms, stddev: %fms\n", mean, stddev));
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}
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#endif
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if (!gThread)
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return;
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gThread->Shutdown();
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NS_RELEASE(gThread);
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}
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nsresult nsTimerImpl::InitCommon(PRUint32 aType, PRUint32 aDelay)
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{
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nsresult rv;
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NS_ENSURE_TRUE(gThread, NS_ERROR_NOT_INITIALIZED);
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rv = gThread->Init();
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NS_ENSURE_SUCCESS(rv, rv);
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/**
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* In case of re-Init, both with and without a preceding Cancel, clear the
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* mCanceled flag and assign a new mGeneration. But first, remove any armed
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* timer from the timer thread's list.
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*
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* If we are racing with the timer thread to remove this timer and we lose,
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* the RemoveTimer call made here will fail to find this timer in the timer
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* thread's list, and will return false harmlessly. We test mArmed here to
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* avoid the small overhead in RemoveTimer of locking the timer thread and
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* checking its list for this timer. It's safe to test mArmed even though
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* it might be cleared on another thread in the next cycle (or even already
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* be cleared by another CPU whose store hasn't reached our CPU's cache),
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* because RemoveTimer is idempotent.
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*/
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if (mArmed)
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gThread->RemoveTimer(this);
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mCanceled = false;
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mTimeout = TimeStamp();
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mGeneration = PR_ATOMIC_INCREMENT(&gGenerator);
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mType = (PRUint8)aType;
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SetDelayInternal(aDelay);
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return gThread->AddTimer(this);
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}
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NS_IMETHODIMP nsTimerImpl::InitWithFuncCallback(nsTimerCallbackFunc aFunc,
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void *aClosure,
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PRUint32 aDelay,
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PRUint32 aType)
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{
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NS_ENSURE_ARG_POINTER(aFunc);
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ReleaseCallback();
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mCallbackType = CALLBACK_TYPE_FUNC;
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mCallback.c = aFunc;
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mClosure = aClosure;
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return InitCommon(aType, aDelay);
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}
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NS_IMETHODIMP nsTimerImpl::InitWithCallback(nsITimerCallback *aCallback,
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PRUint32 aDelay,
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PRUint32 aType)
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{
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NS_ENSURE_ARG_POINTER(aCallback);
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ReleaseCallback();
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mCallbackType = CALLBACK_TYPE_INTERFACE;
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mCallback.i = aCallback;
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NS_ADDREF(mCallback.i);
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return InitCommon(aType, aDelay);
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}
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NS_IMETHODIMP nsTimerImpl::Init(nsIObserver *aObserver,
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PRUint32 aDelay,
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PRUint32 aType)
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{
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NS_ENSURE_ARG_POINTER(aObserver);
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ReleaseCallback();
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mCallbackType = CALLBACK_TYPE_OBSERVER;
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mCallback.o = aObserver;
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NS_ADDREF(mCallback.o);
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return InitCommon(aType, aDelay);
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}
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NS_IMETHODIMP nsTimerImpl::Cancel()
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{
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mCanceled = true;
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if (gThread)
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gThread->RemoveTimer(this);
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ReleaseCallback();
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return NS_OK;
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}
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NS_IMETHODIMP nsTimerImpl::SetDelay(PRUint32 aDelay)
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{
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if (mCallbackType == CALLBACK_TYPE_UNKNOWN && mType == TYPE_ONE_SHOT) {
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// This may happen if someone tries to re-use a one-shot timer
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// by re-setting delay instead of reinitializing the timer.
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NS_ERROR("nsITimer->SetDelay() called when the "
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"one-shot timer is not set up.");
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return NS_ERROR_NOT_INITIALIZED;
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}
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// If we're already repeating precisely, update mTimeout now so that the
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// new delay takes effect in the future.
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if (!mTimeout.IsNull() && mType == TYPE_REPEATING_PRECISE)
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mTimeout = TimeStamp::Now();
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SetDelayInternal(aDelay);
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if (!mFiring && gThread)
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gThread->TimerDelayChanged(this);
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return NS_OK;
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}
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NS_IMETHODIMP nsTimerImpl::GetDelay(PRUint32* aDelay)
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{
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*aDelay = mDelay;
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return NS_OK;
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}
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NS_IMETHODIMP nsTimerImpl::SetType(PRUint32 aType)
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{
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mType = (PRUint8)aType;
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// XXX if this is called, we should change the actual type.. this could effect
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// repeating timers. we need to ensure in Fire() that if mType has changed
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// during the callback that we don't end up with the timer in the queue twice.
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return NS_OK;
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}
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NS_IMETHODIMP nsTimerImpl::GetType(PRUint32* aType)
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{
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*aType = mType;
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return NS_OK;
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}
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NS_IMETHODIMP nsTimerImpl::GetClosure(void** aClosure)
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{
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*aClosure = mClosure;
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return NS_OK;
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}
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NS_IMETHODIMP nsTimerImpl::GetCallback(nsITimerCallback **aCallback)
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{
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if (mCallbackType == CALLBACK_TYPE_INTERFACE)
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NS_IF_ADDREF(*aCallback = mCallback.i);
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else if (mTimerCallbackWhileFiring)
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NS_ADDREF(*aCallback = mTimerCallbackWhileFiring);
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else
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*aCallback = nsnull;
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return NS_OK;
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}
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NS_IMETHODIMP nsTimerImpl::GetTarget(nsIEventTarget** aTarget)
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{
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NS_IF_ADDREF(*aTarget = mEventTarget);
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return NS_OK;
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}
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NS_IMETHODIMP nsTimerImpl::SetTarget(nsIEventTarget* aTarget)
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{
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NS_ENSURE_TRUE(mCallbackType == CALLBACK_TYPE_UNKNOWN,
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NS_ERROR_ALREADY_INITIALIZED);
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if (aTarget)
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mEventTarget = aTarget;
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else
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mEventTarget = static_cast<nsIEventTarget*>(NS_GetCurrentThread());
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return NS_OK;
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}
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void nsTimerImpl::Fire()
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{
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if (mCanceled)
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return;
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SAMPLE_LABEL("Timer", "Fire");
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TimeStamp now = TimeStamp::Now();
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#ifdef DEBUG_TIMERS
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if (PR_LOG_TEST(gTimerLog, PR_LOG_DEBUG)) {
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TimeDuration a = now - mStart; // actual delay in intervals
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TimeDuration b = TimeDuration::FromMilliseconds(mDelay); // expected delay in intervals
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TimeDuration delta = (a > b) ? a - b : b - a;
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PRUint32 d = delta.ToMilliseconds(); // delta in ms
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sDeltaSum += d;
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sDeltaSumSquared += double(d) * double(d);
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sDeltaNum++;
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PR_LOG(gTimerLog, PR_LOG_DEBUG, ("[this=%p] expected delay time %4ums\n", this, mDelay));
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PR_LOG(gTimerLog, PR_LOG_DEBUG, ("[this=%p] actual delay time %fms\n", this, a.ToMilliseconds()));
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PR_LOG(gTimerLog, PR_LOG_DEBUG, ("[this=%p] (mType is %d) -------\n", this, mType));
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PR_LOG(gTimerLog, PR_LOG_DEBUG, ("[this=%p] delta %4dms\n", this, (a > b) ? (PRInt32)d : -(PRInt32)d));
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mStart = mStart2;
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mStart2 = TimeStamp();
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}
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#endif
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TimeStamp timeout = mTimeout;
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if (IsRepeatingPrecisely()) {
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// Precise repeating timers advance mTimeout by mDelay without fail before
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// calling Fire().
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timeout -= TimeDuration::FromMilliseconds(mDelay);
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}
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if (gThread)
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gThread->UpdateFilter(mDelay, timeout, now);
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if (mCallbackType == CALLBACK_TYPE_INTERFACE)
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mTimerCallbackWhileFiring = mCallback.i;
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mFiring = true;
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// Handle callbacks that re-init the timer, but avoid leaking.
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// See bug 330128.
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CallbackUnion callback = mCallback;
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PRUintn callbackType = mCallbackType;
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if (callbackType == CALLBACK_TYPE_INTERFACE)
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NS_ADDREF(callback.i);
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else if (callbackType == CALLBACK_TYPE_OBSERVER)
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NS_ADDREF(callback.o);
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ReleaseCallback();
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switch (callbackType) {
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case CALLBACK_TYPE_FUNC:
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callback.c(this, mClosure);
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break;
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case CALLBACK_TYPE_INTERFACE:
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callback.i->Notify(this);
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break;
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case CALLBACK_TYPE_OBSERVER:
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callback.o->Observe(static_cast<nsITimer*>(this),
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NS_TIMER_CALLBACK_TOPIC,
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nsnull);
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break;
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default:;
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}
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// If the callback didn't re-init the timer, and it's not a one-shot timer,
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// restore the callback state.
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if (mCallbackType == CALLBACK_TYPE_UNKNOWN &&
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mType != TYPE_ONE_SHOT && !mCanceled) {
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mCallback = callback;
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mCallbackType = callbackType;
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} else {
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// The timer was a one-shot, or the callback was reinitialized.
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if (callbackType == CALLBACK_TYPE_INTERFACE)
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NS_RELEASE(callback.i);
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else if (callbackType == CALLBACK_TYPE_OBSERVER)
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NS_RELEASE(callback.o);
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}
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mFiring = false;
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mTimerCallbackWhileFiring = nsnull;
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#ifdef DEBUG_TIMERS
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if (PR_LOG_TEST(gTimerLog, PR_LOG_DEBUG)) {
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PR_LOG(gTimerLog, PR_LOG_DEBUG,
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("[this=%p] Took %fms to fire timer callback\n",
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this, (TimeStamp::Now() - now).ToMilliseconds()));
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}
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#endif
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// Reschedule repeating timers, except REPEATING_PRECISE which already did
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// that in PostTimerEvent, but make sure that we aren't armed already (which
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// can happen if the callback reinitialized the timer).
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if (IsRepeating() && mType != TYPE_REPEATING_PRECISE && !mArmed) {
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if (mType == TYPE_REPEATING_SLACK)
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SetDelayInternal(mDelay); // force mTimeout to be recomputed. For
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// REPEATING_PRECISE_CAN_SKIP timers this has
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// already happened.
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if (gThread)
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gThread->AddTimer(this);
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}
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}
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class nsTimerEvent : public nsRunnable {
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public:
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NS_IMETHOD Run();
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nsTimerEvent(nsTimerImpl *timer, PRInt32 generation)
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: mTimer(timer), mGeneration(generation) {
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// timer is already addref'd for us
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MOZ_COUNT_CTOR(nsTimerEvent);
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}
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#ifdef DEBUG_TIMERS
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TimeStamp mInitTime;
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#endif
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private:
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~nsTimerEvent() {
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#ifdef DEBUG
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if (mTimer)
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NS_WARNING("leaking reference to nsTimerImpl");
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#endif
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MOZ_COUNT_DTOR(nsTimerEvent);
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}
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nsTimerImpl *mTimer;
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PRInt32 mGeneration;
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};
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NS_IMETHODIMP nsTimerEvent::Run()
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{
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nsRefPtr<nsTimerImpl> timer;
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timer.swap(mTimer);
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if (mGeneration != timer->GetGeneration())
|
|
return NS_OK;
|
|
|
|
#ifdef DEBUG_TIMERS
|
|
if (PR_LOG_TEST(gTimerLog, PR_LOG_DEBUG)) {
|
|
TimeStamp now = TimeStamp::Now();
|
|
PR_LOG(gTimerLog, PR_LOG_DEBUG,
|
|
("[this=%p] time between PostTimerEvent() and Fire(): %fms\n",
|
|
this, (now - mInitTime).ToMilliseconds()));
|
|
}
|
|
#endif
|
|
|
|
timer->Fire();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult nsTimerImpl::PostTimerEvent()
|
|
{
|
|
// XXX we may want to reuse this nsTimerEvent in the case of repeating timers.
|
|
|
|
// Since TimerThread addref'd 'this' for us, we don't need to addref here.
|
|
// We will release in destroyMyEvent. We need to copy the generation number
|
|
// from this timer into the event, so we can avoid firing a timer that was
|
|
// re-initialized after being canceled.
|
|
|
|
nsRefPtr<nsTimerEvent> event = new nsTimerEvent(this, mGeneration);
|
|
if (!event)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
#ifdef DEBUG_TIMERS
|
|
if (PR_LOG_TEST(gTimerLog, PR_LOG_DEBUG)) {
|
|
event->mInitTime = TimeStamp::Now();
|
|
}
|
|
#endif
|
|
|
|
// If this is a repeating precise timer, we need to calculate the time for
|
|
// the next timer to fire before we make the callback.
|
|
if (IsRepeatingPrecisely()) {
|
|
SetDelayInternal(mDelay);
|
|
|
|
// But only re-arm REPEATING_PRECISE timers.
|
|
if (gThread && mType == TYPE_REPEATING_PRECISE) {
|
|
nsresult rv = gThread->AddTimer(this);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
}
|
|
}
|
|
|
|
nsresult rv = mEventTarget->Dispatch(event, NS_DISPATCH_NORMAL);
|
|
if (NS_FAILED(rv) && gThread)
|
|
gThread->RemoveTimer(this);
|
|
return rv;
|
|
}
|
|
|
|
void nsTimerImpl::SetDelayInternal(PRUint32 aDelay)
|
|
{
|
|
TimeDuration delayInterval = TimeDuration::FromMilliseconds(aDelay);
|
|
|
|
mDelay = aDelay;
|
|
|
|
TimeStamp now = TimeStamp::Now();
|
|
if (mTimeout.IsNull() || mType != TYPE_REPEATING_PRECISE)
|
|
mTimeout = now;
|
|
|
|
mTimeout += delayInterval;
|
|
|
|
#ifdef DEBUG_TIMERS
|
|
if (PR_LOG_TEST(gTimerLog, PR_LOG_DEBUG)) {
|
|
if (mStart.IsNull())
|
|
mStart = now;
|
|
else
|
|
mStart2 = now;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
// NOT FOR PUBLIC CONSUMPTION!
|
|
nsresult
|
|
NS_NewTimer(nsITimer* *aResult, nsTimerCallbackFunc aCallback, void *aClosure,
|
|
PRUint32 aDelay, PRUint32 aType)
|
|
{
|
|
nsTimerImpl* timer = new nsTimerImpl();
|
|
if (timer == nsnull)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
NS_ADDREF(timer);
|
|
|
|
nsresult rv = timer->InitWithFuncCallback(aCallback, aClosure,
|
|
aDelay, aType);
|
|
if (NS_FAILED(rv)) {
|
|
NS_RELEASE(timer);
|
|
return rv;
|
|
}
|
|
|
|
*aResult = timer;
|
|
return NS_OK;
|
|
}
|