mfbt/ReentrancyGuard.h@97036ab72558
mfbt/ReentrancyGuard.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
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/. */
7 /* Small helper class for asserting uses of a class are non-reentrant. */
9 #ifndef mozilla_ReentrancyGuard_h
10 #define mozilla_ReentrancyGuard_h
12 #include "mozilla/Assertions.h"
13 #include "mozilla/Attributes.h"
14 #include "mozilla/GuardObjects.h"
16 namespace mozilla {
18 /* Useful for implementing containers that assert non-reentrancy */
19 class ReentrancyGuard
20 {
21 MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
22 #ifdef DEBUG
23 bool& entered;
24 #endif
26 public:
27 template<class T>
28 #ifdef DEBUG
29 ReentrancyGuard(T& obj
30 MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
31 : entered(obj.entered)
32 #else
33 ReentrancyGuard(T&
34 MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
35 #endif
36 {
37 MOZ_GUARD_OBJECT_NOTIFIER_INIT;
38 #ifdef DEBUG
39 MOZ_ASSERT(!entered);
40 entered = true;
41 #endif
42 }
43 ~ReentrancyGuard()
44 {
45 #ifdef DEBUG
46 entered = false;
47 #endif
48 }
50 private:
51 ReentrancyGuard(const ReentrancyGuard&) MOZ_DELETE;
52 void operator=(const ReentrancyGuard&) MOZ_DELETE;
53 };
55 } // namespace mozilla
57 #endif /* mozilla_ReentrancyGuard_h */
