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> 13 class MOZ_RAII UnlockGuard; 14 15 template <typename Mutex> 16 class MOZ_RAII LockGuard { 17 friend class UnlockGuard<Mutex>; 18 friend class ConditionVariable; 19 Mutex& lock; 20 21 public: LockGuard(Mutex & aLock)22 explicit LockGuard(Mutex& aLock) : lock(aLock) { lock.lock(); } 23 ~LockGuard()24 ~LockGuard() { lock.unlock(); } 25 }; 26 27 template <typename Mutex> 28 class MOZ_RAII UnlockGuard { 29 Mutex& lock; 30 31 public: UnlockGuard(LockGuard<Mutex> & aGuard)32 explicit UnlockGuard(LockGuard<Mutex>& aGuard) : lock(aGuard.lock) { 33 lock.unlock(); 34 } 35 ~UnlockGuard()36 ~UnlockGuard() { lock.lock(); } 37 }; 38 39 } // namespace js 40 41 #endif // threading_LockGuard_h 42