1 files changed, 53 insertions, 0 deletions
diff --git a/xpcom/threads/DelayedRunnable.h b/xpcom/threads/DelayedRunnable.h
new file mode 100644
index 0000000000..242278fa5b
--- /dev/null
+++ b/xpcom/threads/DelayedRunnable.h
@@ -0,0 +1,53 @@
+/* -*- 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/. */
+
+#ifndef XPCOM_THREADS_DELAYEDRUNNABLE_H_
+#define XPCOM_THREADS_DELAYEDRUNNABLE_H_
+
+#include "mozilla/TimeStamp.h"
+#include "nsCOMPtr.h"
+#include "nsIRunnable.h"
+#include "nsITargetShutdownTask.h"
+#include "nsITimer.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+
+class DelayedRunnable : public Runnable,
+                        public nsITimerCallback,
+                        public nsITargetShutdownTask {
+ public:
+  DelayedRunnable(already_AddRefed<nsISerialEventTarget> aTarget,
+                  already_AddRefed<nsIRunnable> aRunnable, uint32_t aDelay);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIRUNNABLE
+  NS_DECL_NSITIMERCALLBACK
+
+  nsresult Init();
+
+  /**
+   * Called when the target is going away so the runnable can be released safely
+   * on the target thread.
+   */
+  void TargetShutdown() override;
+
+ private:
+  ~DelayedRunnable() = default;
+  nsresult DoRun();
+
+  const nsCOMPtr<nsISerialEventTarget> mTarget;
+  const TimeStamp mDelayedFrom;
+  const uint32_t mDelay;
+
+  mozilla::Mutex mMutex{"DelayedRunnable"};
+  nsCOMPtr<nsIRunnable> mWrappedRunnable;
+  nsCOMPtr<nsITimer> mTimer;
+};
+
+}  // namespace mozilla
+
+#endif