From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- mfbt/ReentrancyGuard.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 mfbt/ReentrancyGuard.h (limited to 'mfbt/ReentrancyGuard.h') diff --git a/mfbt/ReentrancyGuard.h b/mfbt/ReentrancyGuard.h new file mode 100644 index 0000000000..56c963b418 --- /dev/null +++ b/mfbt/ReentrancyGuard.h @@ -0,0 +1,50 @@ +/* -*- 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" + +namespace mozilla { + +/* Useful for implementing containers that assert non-reentrancy */ +class MOZ_RAII ReentrancyGuard { +#ifdef DEBUG + bool& mEntered; +#endif + + public: + template +#ifdef DEBUG + explicit ReentrancyGuard(T& aObj) + : mEntered(aObj.mEntered) +#else + explicit ReentrancyGuard(T&) +#endif + { +#ifdef DEBUG + MOZ_ASSERT(!mEntered); + mEntered = true; +#endif + } + ~ReentrancyGuard() { +#ifdef DEBUG + mEntered = false; +#endif + } + + private: + ReentrancyGuard(const ReentrancyGuard&) = delete; + void operator=(const ReentrancyGuard&) = delete; +}; + +} // namespace mozilla + +#endif /* mozilla_ReentrancyGuard_h */ -- cgit v1.2.3