1 files changed, 61 insertions, 0 deletions
diff --git a/dom/media/systemservices/LoadMonitor.h b/dom/media/systemservices/LoadMonitor.h
new file mode 100644
index 000000000..3731b97dc
--- /dev/null
+++ b/dom/media/systemservices/LoadMonitor.h
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 50; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 _LOADMONITOR_H_
+#define _LOADMONITOR_H_
+
+#include "mozilla/Mutex.h"
+#include "mozilla/CondVar.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/Atomics.h"
+#include "nsCOMPtr.h"
+#include "nsIThread.h"
+#include "nsIObserver.h"
+
+namespace mozilla {
+class LoadInfoCollectRunner;
+
+class LoadNotificationCallback
+{
+public:
+    virtual void LoadChanged(float aSystemLoad, float aProcessLoad) = 0;
+};
+
+class LoadMonitor final : public nsIObserver
+{
+public:
+    NS_DECL_THREADSAFE_ISUPPORTS
+    NS_DECL_NSIOBSERVER
+
+    explicit LoadMonitor(int aLoadUpdateInterval);
+
+    nsresult Init(RefPtr<LoadMonitor> &self);
+    void SetLoadChangeCallback(LoadNotificationCallback* aCallback);
+    void Shutdown();
+    float GetSystemLoad();
+    float GetProcessLoad();
+
+    friend class LoadInfoCollectRunner;
+
+private:
+    ~LoadMonitor();
+
+    void SetProcessLoad(float load);
+    void SetSystemLoad(float load);
+    void FireCallbacks();
+
+    int                  mLoadUpdateInterval;
+    mozilla::Mutex       mLock;
+    mozilla::CondVar     mCondVar;
+    bool                 mShutdownPending;
+    nsCOMPtr<nsIThread>  mLoadInfoThread;
+    float                mSystemLoad;
+    float                mProcessLoad;
+    LoadNotificationCallback* mLoadNotificationCallback;
+};
+
+} //namespace
+
+#endif /* _LOADMONITOR_H_ */