3 files changed, 94 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
diff --git a/ipc/mscom/mozglue/ProcessRuntimeShared.h b/ipc/mscom/mozglue/ProcessRuntimeShared.h
new file mode 100644
index 0000000000..5d3fb073bc
--- /dev/null
+++ b/ipc/mscom/mozglue/ProcessRuntimeShared.h
@@ -0,0 +1,49 @@
+/* -*- 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_mscom_ProcessRuntimeShared_h
+#define mozilla_mscom_ProcessRuntimeShared_h
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Types.h"
+
+namespace mozilla {
+namespace mscom {
+namespace detail {
+
+MFBT_API bool& BeginProcessRuntimeInit();
+MFBT_API void EndProcessRuntimeInit();
+
+}  // namespace detail
+
+class MOZ_RAII ProcessInitLock final {
+ public:
+  ProcessInitLock()
+      : mIsProcessInitialized(detail::BeginProcessRuntimeInit()) {}
+
+  ~ProcessInitLock() { detail::EndProcessRuntimeInit(); }
+
+  bool IsInitialized() const { return mIsProcessInitialized; }
+
+  void SetInitialized() {
+    MOZ_ASSERT(!mIsProcessInitialized);
+    mIsProcessInitialized = true;
+  }
+
+  ProcessInitLock(const ProcessInitLock&) = delete;
+  ProcessInitLock(ProcessInitLock&&) = delete;
+  ProcessInitLock operator=(const ProcessInitLock&) = delete;
+  ProcessInitLock operator=(ProcessInitLock&&) = delete;
+
+ private:
+  bool& mIsProcessInitialized;
+};
+
+}  // namespace mscom
+}  // namespace mozilla
+
+#endif  // mozilla_mscom_ProcessRuntimeShared_h
diff --git a/ipc/mscom/mozglue/moz.build b/ipc/mscom/mozglue/moz.build
new file mode 100644
index 0000000000..f52a772324
--- /dev/null
+++ b/ipc/mscom/mozglue/moz.build
@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+FINAL_LIBRARY = "mozglue"
+
+EXPORTS.mozilla.mscom += [
+    "ProcessRuntimeShared.h",
+]
+
+UNIFIED_SOURCES += [
+    "ProcessRuntimeShared.cpp",
+]