1 files changed, 54 insertions, 0 deletions
diff --git a/xpcom/threads/ThreadEventTarget.h b/xpcom/threads/ThreadEventTarget.h
new file mode 100644
index 0000000000..1b298521cd
--- /dev/null
+++ b/xpcom/threads/ThreadEventTarget.h
@@ -0,0 +1,54 @@
+/* -*- 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 mozilla_ThreadEventTarget_h
+#define mozilla_ThreadEventTarget_h
+
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/SynchronizedEventQueue.h"  // for ThreadTargetSink
+#include "nsISerialEventTarget.h"
+
+namespace mozilla {
+
+// ThreadEventTarget handles the details of posting an event to a thread. It can
+// be used with any ThreadTargetSink implementation.
+class ThreadEventTarget final : public nsISerialEventTarget {
+ public:
+  ThreadEventTarget(ThreadTargetSink* aSink, bool aIsMainThread);
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIEVENTTARGET_FULL
+
+  // Disconnects the target so that it can no longer post events.
+  void Disconnect(const MutexAutoLock& aProofOfLock) {
+    mSink->Disconnect(aProofOfLock);
+  }
+
+  // Sets the thread for which IsOnCurrentThread returns true to the current
+  // thread.
+  void SetCurrentThread();
+  // Call ClearCurrentThread() before the PRThread is deleted on thread join.
+  void ClearCurrentThread();
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
+    size_t n = 0;
+    if (mSink) {
+      n += mSink->SizeOfIncludingThis(aMallocSizeOf);
+    }
+    return aMallocSizeOf(this) + n;
+  }
+
+ private:
+  ~ThreadEventTarget() = default;
+
+  RefPtr<ThreadTargetSink> mSink;
+  bool mIsMainThread;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_ThreadEventTarget_h