1 files changed, 30 insertions, 0 deletions
diff --git a/ipc/mscom/mozglue/ProcessRuntimeShared.cpp b/ipc/mscom/mozglue/ProcessRuntimeShared.cpp
new file mode 100644
index 0000000000..b9a46316de
--- /dev/null
+++ b/ipc/mscom/mozglue/ProcessRuntimeShared.cpp
@@ -0,0 +1,30 @@
+/* -*- 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/. */
+
+#include "mozilla/mscom/ProcessRuntimeShared.h"
+
+#include "mozilla/glue/WinUtils.h"
+
+// We allow multiple ProcessRuntime instances to exist simultaneously (even
+// on separate threads), but only one should be doing the process-wide
+// initialization. These variables provide that mutual exclusion.
+static mozilla::glue::Win32SRWLock gLock;
+static bool gIsProcessInitialized = false;
+
+namespace mozilla {
+namespace mscom {
+namespace detail {
+
+MFBT_API bool& BeginProcessRuntimeInit() {
+  gLock.LockExclusive();
+  return gIsProcessInitialized;
+}
+
+MFBT_API void EndProcessRuntimeInit() { gLock.UnlockExclusive(); }
+
+}  //  namespace detail
+}  // namespace mscom
+}  // namespace mozilla