Quelle DelayedRunnable.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "DelayedRunnable.h"

#include "mozilla/ProfilerRunnable.h"

namespace mozilla {

DelayedRunnable::DelayedRunnable(already_AddRefed<nsISerialEventTarget> aTarget,
                                 already_AddRefed<nsIRunnable> aRunnable,
                                 uint32_t aDelay)
    : mozilla::Runnable("DelayedRunnable"),
      mTarget(aTarget),
      mDelayedFrom(TimeStamp::NowLoRes()),
      mDelay(aDelay),
      mWrappedRunnable(aRunnable) {}

nsresult DelayedRunnable::Init() {
  MutexAutoLock lock(mMutex);
  if (!mWrappedRunnable) {
    MOZ_ASSERT_UNREACHABLE();
    return NS_ERROR_INVALID_ARG;
  }

  nsresult rv = mTarget->RegisterShutdownTask(this);
  if (NS_FAILED(rv)) {
    MOZ_DIAGNOSTIC_ASSERT(
        rv == NS_ERROR_UNEXPECTED,
        "DelayedRunnable target must support RegisterShutdownTask");
    NS_WARNING("DelayedRunnable init after target is shutdown");
    return rv;
  }

  rv = NS_NewTimerWithCallback(getter_AddRefs(mTimer), this, mDelay,
                               nsITimer::TYPE_ONE_SHOT, mTarget);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    mTarget->UnregisterShutdownTask(this);
  }
  return rv;
}

NS_IMETHODIMP DelayedRunnable::Run() {
  MOZ_ASSERT(mTarget->IsOnCurrentThread());

  nsCOMPtr<nsIRunnable> runnable;
  {
    MutexAutoLock lock(mMutex);
    MOZ_ASSERT(mTimer, "Init() must have been called");

    // Already ran?
    if (!mWrappedRunnable) {
      return NS_OK;
    }

    // Are we too early?
    if ((mozilla::TimeStamp::NowLoRes() - mDelayedFrom).ToMilliseconds() <
        mDelay) {
      return NS_OK;  // Let the nsITimer run us.
    }

    mTimer->Cancel();
    mTarget->UnregisterShutdownTask(this);
    runnable = mWrappedRunnable.forget();
  }

  AUTO_PROFILE_FOLLOWING_RUNNABLE(runnable);
  return runnable->Run();
}

NS_IMETHODIMP DelayedRunnable::Notify(nsITimer* aTimer) {
  MOZ_ASSERT(mTarget->IsOnCurrentThread());

  nsCOMPtr<nsIRunnable> runnable;
  {
    MutexAutoLock lock(mMutex);
    MOZ_ASSERT(mTimer, "Init() must have been called");

    // We may have already run due to races
    if (!mWrappedRunnable) {
      return NS_OK;
    }

    mTarget->UnregisterShutdownTask(this);
    runnable = mWrappedRunnable.forget();
  }

  AUTO_PROFILE_FOLLOWING_RUNNABLE(runnable);
  return runnable->Run();
}

void DelayedRunnable::TargetShutdown() {
  MOZ_ASSERT(mTarget->IsOnCurrentThread());

  // Called at shutdown
  MutexAutoLock lock(mMutex);
  if (!mWrappedRunnable) {
    return;
  }
  mWrappedRunnable = nullptr;

  if (mTimer) {
    mTimer->Cancel();
  }
}

NS_IMPL_ISUPPORTS_INHERITED(DelayedRunnable, Runnable, nsITimerCallback,
                            nsITargetShutdownTask)

}  // namespace mozilla

quality97%

¤ Dauer der Verarbeitung: 0.4 Sekunden ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.