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-rw-r--r--dom/media/systemservices/OSXRunLoopSingleton.h25
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diff --git a/dom/media/systemservices/OSXRunLoopSingleton.h b/dom/media/systemservices/OSXRunLoopSingleton.h
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+++ b/dom/media/systemservices/OSXRunLoopSingleton.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* 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 OSXRUNLOOPSINGLETON_H_
+#define OSXRUNLOOPSINGLETON_H_
+
+#include <mozilla/Types.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/* This function tells CoreAudio to use its own thread for device change
+ * notifications, and can be called from any thread without external
+ * synchronization. */
+void MOZ_EXPORT
+mozilla_set_coreaudio_notification_runloop_if_needed();
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif // OSXRUNLOOPSINGLETON_H_