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/. */
6 
7 #ifndef threading_LockGuard_h
8 #define threading_LockGuard_h
9 
10 namespace js {
11 
12 template <typename Mutex> class MOZ_RAII UnlockGuard;
13 
14 template <typename Mutex>
15 class MOZ_RAII LockGuard
16 {
17   friend class UnlockGuard<Mutex>;
18   friend class ConditionVariable;
19   Mutex& lock;
20 
21 public:
22   explicit LockGuard(Mutex& aLock)
23     : lock(aLock)
24   {
25     lock.lock();
26   }
27 
28   ~LockGuard() {
29     lock.unlock();
30   }
31 };
32 
33 template <typename Mutex>
34 class MOZ_RAII UnlockGuard
35 {
36   Mutex& lock;
37 
38 public:
39   explicit UnlockGuard(LockGuard<Mutex>& aGuard)
40     : lock(aGuard.lock)
41   {
42     lock.unlock();
43   }
44 
45   ~UnlockGuard() {
46     lock.lock();
47   }
48 };
49 
50 } // namespace js
51 
52 #endif // threading_LockGuard_h
53