mfbt/ReentrancyGuard.h
author Martin Thomson <martin.thomson@gmail.com>
Thu, 02 Oct 2014 16:36:48 -0700
changeset 225785 ae15f14a1db1e115e7a5dc638de7c92fbe8c6f58
parent 214333 91d7659bb35145e10ff737753688e0972c1a79b5
child 248684 86924ac6a94a9147bcae518239d7a33b5981062b
permissions -rw-r--r--
Bug 1083058 - Add a pref to control TLS version fallback. r=keeler, a=lsblakk

/* -*- 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 */