mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-11 02:56:06 +00:00
734 lines
20 KiB
C++
734 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 "pratom.h"
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#include "GeckoProfiler.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/IntegerPrintfMacros.h"
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#include "mozilla/Logging.h"
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#ifdef MOZ_NUWA_PROCESS
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#include "ipc/Nuwa.h"
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#endif
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#ifdef MOZ_TASK_TRACER
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#include "GeckoTaskTracerImpl.h"
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using namespace mozilla::tasktracer;
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#endif
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#ifdef XP_WIN
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#include <process.h>
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#ifndef getpid
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#define getpid _getpid
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#endif
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#else
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#include <unistd.h>
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#endif
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using mozilla::Atomic;
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using mozilla::LogLevel;
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using mozilla::TimeDuration;
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using mozilla::TimeStamp;
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static Atomic<int32_t> gGenerator;
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static TimerThread* gThread = nullptr;
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// This module prints info about the precision of timers.
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static mozilla::LazyLogModule sTimerLog("nsTimerImpl");
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mozilla::LogModule*
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GetTimerLog()
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{
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return sTimerLog;
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}
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// This module prints info about which timers are firing, which is useful for
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// wakeups for the purposes of power profiling. Set the following environment
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// variable before starting the browser.
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//
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// NSPR_LOG_MODULES=TimerFirings:4
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//
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// Then a line will be printed for every timer that fires. The name used for a
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// |CallbackType::Function| timer depends on the circumstances.
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//
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// - If it was explicitly named (e.g. it was initialized with
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// InitWithNamedFuncCallback()) then that explicit name will be shown.
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//
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// - Otherwise, if we are on a platform that supports function name lookup
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// (Mac or Linux) then the looked-up name will be shown with a
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// "[from dladdr]" annotation. On Mac the looked-up name will be immediately
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// useful. On Linux it'll need post-processing with
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// tools/rb/fix_linux_stack.py.
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//
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// - Otherwise, no name will be printed. If many timers hit this case then
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// you'll need to re-run the workload on a Mac to find out which timers they
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// are, and then give them explicit names.
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//
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// If you redirect this output to a file called "out", you can then
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// post-process it with a command something like the following.
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//
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// cat out | grep timer | sort | uniq -c | sort -r -n
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//
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// This will show how often each unique line appears, with the most common ones
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// first.
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//
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// More detailed docs are here:
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// https://developer.mozilla.org/en-US/docs/Mozilla/Performance/TimerFirings_logging
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//
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static mozilla::LazyLogModule sTimerFiringsLog("TimerFirings");
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mozilla::LogModule*
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GetTimerFiringsLog()
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{
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return sTimerFiringsLog;
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}
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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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}
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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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NS_IMPL_QUERY_INTERFACE(nsTimerImpl, nsITimer)
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NS_IMPL_ADDREF(nsTimerImpl)
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NS_IMETHODIMP_(MozExternalRefCountType)
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nsTimerImpl::Release(void)
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{
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nsrefcnt count;
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MOZ_ASSERT(int32_t(mRefCnt) > 0, "dup release");
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count = --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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MOZ_ASSERT(gThread, "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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}
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return count;
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}
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nsTimerImpl::nsTimerImpl() :
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mClosure(nullptr),
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mName(nsTimerImpl::Nothing),
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mCallbackType(CallbackType::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 = nullptr;
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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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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
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nsTimerImpl::Shutdown()
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{
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if (MOZ_LOG_TEST(GetTimerLog(), LogLevel::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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MOZ_LOG(GetTimerLog(), LogLevel::Debug,
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("sDeltaNum = %f, sDeltaSum = %f, sDeltaSumSquared = %f\n",
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sDeltaNum, sDeltaSum, sDeltaSumSquared));
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MOZ_LOG(GetTimerLog(), LogLevel::Debug,
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("mean: %fms, stddev: %fms\n", mean, stddev));
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}
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if (!gThread) {
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return;
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}
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gThread->Shutdown();
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NS_RELEASE(gThread);
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}
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nsresult
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nsTimerImpl::InitCommon(uint32_t aDelay, uint32_t aType)
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{
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nsresult rv;
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if (NS_WARN_IF(!gThread)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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if (!mEventTarget) {
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NS_ERROR("mEventTarget is NULL");
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return NS_ERROR_NOT_INITIALIZED;
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}
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rv = gThread->Init();
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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gThread->RemoveTimer(this);
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mCanceled = false;
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mTimeout = TimeStamp();
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mGeneration = gGenerator++;
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mType = (uint8_t)aType;
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SetDelayInternal(aDelay);
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return gThread->AddTimer(this);
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}
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nsresult
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nsTimerImpl::InitWithFuncCallbackCommon(nsTimerCallbackFunc aFunc,
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void* aClosure,
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uint32_t aDelay,
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uint32_t aType,
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Name aName)
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{
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if (NS_WARN_IF(!aFunc)) {
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return NS_ERROR_INVALID_ARG;
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}
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ReleaseCallback();
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mCallbackType = CallbackType::Function;
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mCallback.c = aFunc;
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mClosure = aClosure;
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mName = aName;
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return InitCommon(aDelay, aType);
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}
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NS_IMETHODIMP
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nsTimerImpl::InitWithFuncCallback(nsTimerCallbackFunc aFunc,
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void* aClosure,
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uint32_t aDelay,
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uint32_t aType)
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{
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Name name(nsTimerImpl::Nothing);
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return InitWithFuncCallbackCommon(aFunc, aClosure, aDelay, aType, name);
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}
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NS_IMETHODIMP
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nsTimerImpl::InitWithNamedFuncCallback(nsTimerCallbackFunc aFunc,
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void* aClosure,
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uint32_t aDelay,
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uint32_t aType,
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const char* aNameString)
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{
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Name name(aNameString);
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return InitWithFuncCallbackCommon(aFunc, aClosure, aDelay, aType, name);
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}
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NS_IMETHODIMP
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nsTimerImpl::InitWithNameableFuncCallback(nsTimerCallbackFunc aFunc,
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void* aClosure,
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uint32_t aDelay,
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uint32_t aType,
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nsTimerNameCallbackFunc aNameFunc)
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{
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Name name(aNameFunc);
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return InitWithFuncCallbackCommon(aFunc, aClosure, aDelay, aType, name);
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}
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NS_IMETHODIMP
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nsTimerImpl::InitWithCallback(nsITimerCallback* aCallback,
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uint32_t aDelay,
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uint32_t aType)
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{
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if (NS_WARN_IF(!aCallback)) {
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return NS_ERROR_INVALID_ARG;
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}
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ReleaseCallback();
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mCallbackType = CallbackType::Interface;
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mCallback.i = aCallback;
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NS_ADDREF(mCallback.i);
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return InitCommon(aDelay, aType);
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}
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NS_IMETHODIMP
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nsTimerImpl::Init(nsIObserver* aObserver, uint32_t aDelay, uint32_t aType)
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{
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if (NS_WARN_IF(!aObserver)) {
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return NS_ERROR_INVALID_ARG;
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}
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ReleaseCallback();
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mCallbackType = CallbackType::Observer;
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mCallback.o = aObserver;
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NS_ADDREF(mCallback.o);
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return InitCommon(aDelay, aType);
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}
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NS_IMETHODIMP
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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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}
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ReleaseCallback();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsTimerImpl::SetDelay(uint32_t aDelay)
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{
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if (mCallbackType == CallbackType::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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SetDelayInternal(aDelay);
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if (!mFiring && gThread) {
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gThread->TimerDelayChanged(this);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsTimerImpl::GetDelay(uint32_t* 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
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nsTimerImpl::SetType(uint32_t aType)
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{
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mType = (uint8_t)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
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nsTimerImpl::GetType(uint32_t* 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
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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
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nsTimerImpl::GetCallback(nsITimerCallback** aCallback)
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{
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if (mCallbackType == CallbackType::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 = nullptr;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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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
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nsTimerImpl::SetTarget(nsIEventTarget* aTarget)
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{
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if (NS_WARN_IF(mCallbackType != CallbackType::Unknown)) {
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return NS_ERROR_ALREADY_INITIALIZED;
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}
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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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}
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return NS_OK;
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}
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void
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nsTimerImpl::Fire()
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{
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if (mCanceled) {
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return;
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}
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#if !defined(MOZILLA_XPCOMRT_API)
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PROFILER_LABEL("Timer", "Fire",
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js::ProfileEntry::Category::OTHER);
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#endif
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TimeStamp now = TimeStamp::Now();
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if (MOZ_LOG_TEST(GetTimerLog(), LogLevel::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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uint32_t 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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MOZ_LOG(GetTimerLog(), LogLevel::Debug,
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("[this=%p] expected delay time %4ums\n", this, mDelay));
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MOZ_LOG(GetTimerLog(), LogLevel::Debug,
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("[this=%p] actual delay time %fms\n", this,
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a.ToMilliseconds()));
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MOZ_LOG(GetTimerLog(), LogLevel::Debug,
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("[this=%p] (mType is %d) -------\n", this, mType));
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MOZ_LOG(GetTimerLog(), LogLevel::Debug,
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("[this=%p] delta %4dms\n",
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this, (a > b) ? (int32_t)d : -(int32_t)d));
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mStart = mStart2;
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mStart2 = TimeStamp();
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}
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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 (mCallbackType == CallbackType::Interface) {
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mTimerCallbackWhileFiring = mCallback.i;
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}
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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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CallbackType callbackType = mCallbackType;
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if (callbackType == CallbackType::Interface) {
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NS_ADDREF(callback.i);
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} else if (callbackType == CallbackType::Observer) {
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NS_ADDREF(callback.o);
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}
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ReleaseCallback();
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if (MOZ_LOG_TEST(GetTimerFiringsLog(), LogLevel::Debug)) {
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LogFiring(callbackType, callback);
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}
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|
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switch (callbackType) {
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case CallbackType::Function:
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callback.c(this, mClosure);
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break;
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case CallbackType::Interface:
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callback.i->Notify(this);
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break;
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case CallbackType::Observer:
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callback.o->Observe(static_cast<nsITimer*>(this),
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NS_TIMER_CALLBACK_TOPIC,
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nullptr);
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break;
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default:
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;
|
|
}
|
|
|
|
// If the callback didn't re-init the timer, and it's not a one-shot timer,
|
|
// restore the callback state.
|
|
if (mCallbackType == CallbackType::Unknown &&
|
|
mType != TYPE_ONE_SHOT && !mCanceled) {
|
|
mCallback = callback;
|
|
mCallbackType = callbackType;
|
|
} else {
|
|
// The timer was a one-shot, or the callback was reinitialized.
|
|
if (callbackType == CallbackType::Interface) {
|
|
NS_RELEASE(callback.i);
|
|
} else if (callbackType == CallbackType::Observer) {
|
|
NS_RELEASE(callback.o);
|
|
}
|
|
}
|
|
|
|
mFiring = false;
|
|
mTimerCallbackWhileFiring = nullptr;
|
|
|
|
MOZ_LOG(GetTimerLog(), LogLevel::Debug,
|
|
("[this=%p] Took %fms to fire timer callback\n",
|
|
this, (TimeStamp::Now() - now).ToMilliseconds()));
|
|
|
|
// Reschedule repeating timers, but make sure that we aren't armed already
|
|
// (which can happen if the callback reinitialized the timer).
|
|
if (IsRepeating() && !mArmed) {
|
|
if (mType == TYPE_REPEATING_SLACK) {
|
|
SetDelayInternal(mDelay); // force mTimeout to be recomputed. For
|
|
}
|
|
// REPEATING_PRECISE_CAN_SKIP timers this has
|
|
// already happened.
|
|
if (gThread) {
|
|
gThread->AddTimer(this);
|
|
}
|
|
}
|
|
}
|
|
|
|
#if defined(XP_MACOSX) || (defined(XP_LINUX) && !defined(ANDROID))
|
|
#define USE_DLADDR 1
|
|
#endif
|
|
|
|
#ifdef USE_DLADDR
|
|
#include <cxxabi.h>
|
|
#include <dlfcn.h>
|
|
#endif
|
|
|
|
// See the big comment above GetTimerFiringsLog() to understand this code.
|
|
void
|
|
nsTimerImpl::LogFiring(CallbackType aCallbackType, CallbackUnion aCallback)
|
|
{
|
|
const char* typeStr;
|
|
switch (mType) {
|
|
case TYPE_ONE_SHOT: typeStr = "ONE_SHOT"; break;
|
|
case TYPE_REPEATING_SLACK: typeStr = "SLACK "; break;
|
|
case TYPE_REPEATING_PRECISE: /* fall through */
|
|
case TYPE_REPEATING_PRECISE_CAN_SKIP: typeStr = "PRECISE "; break;
|
|
default: MOZ_CRASH("bad type");
|
|
}
|
|
|
|
switch (aCallbackType) {
|
|
case CallbackType::Function: {
|
|
bool needToFreeName = false;
|
|
const char* annotation = "";
|
|
const char* name;
|
|
static const size_t buflen = 1024;
|
|
char buf[buflen];
|
|
|
|
if (mName.is<NameString>()) {
|
|
name = mName.as<NameString>();
|
|
|
|
} else if (mName.is<NameFunc>()) {
|
|
mName.as<NameFunc>()(this, mClosure, buf, buflen);
|
|
name = buf;
|
|
|
|
} else {
|
|
MOZ_ASSERT(mName.is<NameNothing>());
|
|
#ifdef USE_DLADDR
|
|
annotation = "[from dladdr] ";
|
|
|
|
Dl_info info;
|
|
void* addr = reinterpret_cast<void*>(aCallback.c);
|
|
if (dladdr(addr, &info) == 0) {
|
|
name = "???[dladdr: failed]";
|
|
|
|
} else if (info.dli_sname) {
|
|
int status;
|
|
name = abi::__cxa_demangle(info.dli_sname, nullptr, nullptr, &status);
|
|
if (status == 0) {
|
|
// Success. Because we didn't pass in a buffer to __cxa_demangle it
|
|
// allocates its own one with malloc() which we must free() later.
|
|
MOZ_ASSERT(name);
|
|
needToFreeName = true;
|
|
} else if (status == -1) {
|
|
name = "???[__cxa_demangle: OOM]";
|
|
} else if (status == -2) {
|
|
name = "???[__cxa_demangle: invalid mangled name]";
|
|
} else if (status == -3) {
|
|
name = "???[__cxa_demangle: invalid argument]";
|
|
} else {
|
|
name = "???[__cxa_demangle: unexpected status value]";
|
|
}
|
|
|
|
} else if (info.dli_fname) {
|
|
// The "#0: " prefix is necessary for fix_linux_stack.py to interpret
|
|
// this string as something to convert.
|
|
snprintf(buf, buflen, "#0: ???[%s +0x%" PRIxPTR "]\n",
|
|
info.dli_fname, uintptr_t(addr) - uintptr_t(info.dli_fbase));
|
|
name = buf;
|
|
|
|
} else {
|
|
name = "???[dladdr: no symbol or shared object obtained]";
|
|
}
|
|
#else
|
|
name = "???[dladdr is unimplemented or doesn't work well on this OS]";
|
|
#endif
|
|
}
|
|
|
|
MOZ_LOG(GetTimerFiringsLog(), LogLevel::Debug,
|
|
("[%d] fn timer (%s %5d ms): %s%s\n",
|
|
getpid(), typeStr, mDelay, annotation, name));
|
|
|
|
if (needToFreeName) {
|
|
free(const_cast<char*>(name));
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case CallbackType::Interface: {
|
|
MOZ_LOG(GetTimerFiringsLog(), LogLevel::Debug,
|
|
("[%d] iface timer (%s %5d ms): %p\n",
|
|
getpid(), typeStr, mDelay, aCallback.i));
|
|
break;
|
|
}
|
|
|
|
case CallbackType::Observer: {
|
|
MOZ_LOG(GetTimerFiringsLog(), LogLevel::Debug,
|
|
("[%d] obs timer (%s %5d ms): %p\n",
|
|
getpid(), typeStr, mDelay, aCallback.o));
|
|
break;
|
|
}
|
|
|
|
case CallbackType::Unknown:
|
|
default: {
|
|
MOZ_LOG(GetTimerFiringsLog(), LogLevel::Debug,
|
|
("[%d] ??? timer (%s, %5d ms)\n",
|
|
getpid(), typeStr, mDelay));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsTimerImpl::SetDelayInternal(uint32_t aDelay)
|
|
{
|
|
TimeDuration delayInterval = TimeDuration::FromMilliseconds(aDelay);
|
|
|
|
mDelay = aDelay;
|
|
|
|
TimeStamp now = TimeStamp::Now();
|
|
mTimeout = now;
|
|
|
|
mTimeout += delayInterval;
|
|
|
|
if (MOZ_LOG_TEST(GetTimerLog(), LogLevel::Debug)) {
|
|
if (mStart.IsNull()) {
|
|
mStart = now;
|
|
} else {
|
|
mStart2 = now;
|
|
}
|
|
}
|
|
}
|
|
|
|
size_t
|
|
nsTimerImpl::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
|
|
{
|
|
return aMallocSizeOf(this);
|
|
}
|
|
|
|
/* static */ const nsTimerImpl::NameNothing nsTimerImpl::Nothing = 0;
|
|
|
|
#ifdef MOZ_TASK_TRACER
|
|
void
|
|
nsTimerImpl::GetTLSTraceInfo()
|
|
{
|
|
mTracedTask.GetTLSTraceInfo();
|
|
}
|
|
|
|
TracedTaskCommon
|
|
nsTimerImpl::GetTracedTask()
|
|
{
|
|
return mTracedTask;
|
|
}
|
|
#endif
|
|
|