gecko-dev/mfbt/ReentrancyGuard.h
Nicholas Nethercote 2a0942be41 Bug 1036789 - Convert the third quarter of MFBT to Gecko style. r=Ms2ger.
--HG--
extra : rebase_source : 668cd394806203ddfa34bd4f226335ff26c846b5
2014-07-10 19:10:17 -07:00

58 lines
1.3 KiB
C++

/* -*- 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/. */
/* Small helper class for asserting uses of a class are non-reentrant. */
#ifndef mozilla_ReentrancyGuard_h
#define mozilla_ReentrancyGuard_h
#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include "mozilla/GuardObjects.h"
namespace mozilla {
/* Useful for implementing containers that assert non-reentrancy */
class ReentrancyGuard
{
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
#ifdef DEBUG
bool& mEntered;
#endif
public:
template<class T>
#ifdef DEBUG
ReentrancyGuard(T& aObj
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mEntered(aObj.mEntered)
#else
ReentrancyGuard(T&
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
#endif
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
#ifdef DEBUG
MOZ_ASSERT(!mEntered);
mEntered = true;
#endif
}
~ReentrancyGuard()
{
#ifdef DEBUG
mEntered = false;
#endif
}
private:
ReentrancyGuard(const ReentrancyGuard&) MOZ_DELETE;
void operator=(const ReentrancyGuard&) MOZ_DELETE;
};
} // namespace mozilla
#endif /* mozilla_ReentrancyGuard_h */