Bug 1426129 - Hold CamerasChild via promoting "this" to a RefPtr. r=pehrsons, a=RyanVM

1 files changed, 10 insertions, 1 deletions

diff --git a/dom/media/systemservices/CamerasChild.h b/dom/media/systemservices/CamerasChild.h
index 1530714e9..9ca125cfd 100644
--- a/dom/media/systemservices/CamerasChild.h
+++ b/dom/media/systemservices/CamerasChild.h
@@ -89,6 +89,14 @@ public:
     return gTheInstance.get()->mFakeDeviceChangeEventThread;
   }
 
+  static bool InShutdown() {
+    return gTheInstance.get()->mInShutdown;
+  }
+
+  static void StartShutdown() {
+    gTheInstance.get()->mInShutdown = true;
+  }
+
 private:
   static Singleton<CamerasSingleton> gTheInstance;
 
@@ -106,6 +114,7 @@ private:
   CamerasChild* mCameras;
   nsCOMPtr<nsIThread> mCamerasChildThread;
   nsCOMPtr<nsIThread> mFakeDeviceChangeEventThread;
+  Atomic<bool> mInShutdown;
 };
 
 // Get a pointer to a CamerasChild object we can use to do IPC with.
@@ -145,7 +154,7 @@ class CamerasChild final : public PCamerasChild
 public:
   // We are owned by the PBackground thread only. CamerasSingleton
   // takes a non-owning reference.
-  NS_INLINE_DECL_REFCOUNTING(CamerasChild)
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CamerasChild)
 
   // IPC messages recevied, received on the PBackground thread
   // these are the actual callbacks with data