xpcom/base/nsMemoryImpl.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef nsMemoryImpl_h__
   8 #define nsMemoryImpl_h__
   9
  10 #include "mozilla/Atomics.h"
  11
  12 #include "nsIMemory.h"
  13 #include "nsIRunnable.h"
  14
  15 // nsMemoryImpl is a static object. We can do this because it doesn't have
  16 // a constructor/destructor or any instance members. Please don't add
  17 // instance member variables, only static member variables.
  18
  19 class nsMemoryImpl : public nsIMemory {
  20  public:
  21   // We don't use the generic macros because we are a special static object
  22   NS_IMETHOD QueryInterface(REFNSIID aIID, void** aResult) override;
  23   NS_IMETHOD_(MozExternalRefCountType) AddRef(void) override { return 1; }
  24   NS_IMETHOD_(MozExternalRefCountType) Release(void) override { return 1; }
  25
  26   NS_DECL_NSIMEMORY
  27
  28   static nsresult Create(nsISupports* aOuter, const nsIID& aIID,
  29                          void** aResult);
  30
  31   nsresult FlushMemory(const char16_t* aReason, bool aImmediate);
  32   void RunFlushers(const char16_t* aReason);
  33
  34  protected:
  35   struct FlushEvent : public nsIRunnable {
  36     constexpr FlushEvent() : mReason(nullptr) {}
  37     NS_DECL_ISUPPORTS_INHERITED
  38     NS_DECL_NSIRUNNABLE
  39     const char16_t* mReason;
  40   };
  41
  42   static mozilla::Atomic<bool> sIsFlushing;
  43   static FlushEvent sFlushEvent;
  44   static PRIntervalTime sLastFlushTime;
  45 };
  46
  47 #endif  // nsMemoryImpl_h__