1 files changed, 47 insertions, 0 deletions
diff --git a/xpcom/base/nsMemoryImpl.h b/xpcom/base/nsMemoryImpl.h
new file mode 100644
index 0000000000..965c5d88dd
--- /dev/null
+++ b/xpcom/base/nsMemoryImpl.h
@@ -0,0 +1,47 @@
+/* -*- 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 nsMemoryImpl_h__
+#define nsMemoryImpl_h__
+
+#include "mozilla/Atomics.h"
+
+#include "nsIMemory.h"
+#include "nsIRunnable.h"
+
+// nsMemoryImpl is a static object. We can do this because it doesn't have
+// a constructor/destructor or any instance members. Please don't add
+// instance member variables, only static member variables.
+
+class nsMemoryImpl : public nsIMemory {
+ public:
+  // We don't use the generic macros because we are a special static object
+  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aResult) override;
+  NS_IMETHOD_(MozExternalRefCountType) AddRef(void) override { return 1; }
+  NS_IMETHOD_(MozExternalRefCountType) Release(void) override { return 1; }
+
+  NS_DECL_NSIMEMORY
+
+  static nsresult Create(nsISupports* aOuter, const nsIID& aIID,
+                         void** aResult);
+
+  nsresult FlushMemory(const char16_t* aReason, bool aImmediate);
+  void RunFlushers(const char16_t* aReason);
+
+ protected:
+  struct FlushEvent : public nsIRunnable {
+    constexpr FlushEvent() : mReason(nullptr) {}
+    NS_DECL_ISUPPORTS_INHERITED
+    NS_DECL_NSIRUNNABLE
+    const char16_t* mReason;
+  };
+
+  static mozilla::Atomic<bool> sIsFlushing;
+  static FlushEvent sFlushEvent;
+  static PRIntervalTime sLastFlushTime;
+};
+
+#endif  // nsMemoryImpl_h__