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-rw-r--r--xpcom/threads/DelayedRunnable.cpp113
1 files changed, 113 insertions, 0 deletions
diff --git a/xpcom/threads/DelayedRunnable.cpp b/xpcom/threads/DelayedRunnable.cpp
new file mode 100644
index 0000000000..a9231442a7
--- /dev/null
+++ b/xpcom/threads/DelayedRunnable.cpp
@@ -0,0 +1,113 @@
+/* -*- 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