michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim: set ts=8 sts=2 et sw=2 tw=80: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* Small helper class for asserting uses of a class are non-reentrant. */
michael@0: 
michael@0: #ifndef mozilla_ReentrancyGuard_h
michael@0: #define mozilla_ReentrancyGuard_h
michael@0: 
michael@0: #include "mozilla/Assertions.h"
michael@0: #include "mozilla/Attributes.h"
michael@0: #include "mozilla/GuardObjects.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: /* Useful for implementing containers that assert non-reentrancy */
michael@0: class ReentrancyGuard
michael@0: {
michael@0:     MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
michael@0: #ifdef DEBUG
michael@0:     bool& entered;
michael@0: #endif
michael@0: 
michael@0:   public:
michael@0:     template<class T>
michael@0: #ifdef DEBUG
michael@0:     ReentrancyGuard(T& obj
michael@0:                     MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
michael@0:       : entered(obj.entered)
michael@0: #else
michael@0:     ReentrancyGuard(T&
michael@0:                     MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
michael@0: #endif
michael@0:     {
michael@0:       MOZ_GUARD_OBJECT_NOTIFIER_INIT;
michael@0: #ifdef DEBUG
michael@0:       MOZ_ASSERT(!entered);
michael@0:       entered = true;
michael@0: #endif
michael@0:     }
michael@0:     ~ReentrancyGuard()
michael@0:     {
michael@0: #ifdef DEBUG
michael@0:       entered = false;
michael@0: #endif
michael@0:     }
michael@0: 
michael@0:   private:
michael@0:     ReentrancyGuard(const ReentrancyGuard&) MOZ_DELETE;
michael@0:     void operator=(const ReentrancyGuard&) MOZ_DELETE;
michael@0: };
michael@0: 
michael@0: } // namespace mozilla
michael@0: 
michael@0: #endif /* mozilla_ReentrancyGuard_h */