LockGuard.h (1223B)
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 #include "mozilla/Attributes.h" 11 12 namespace js { 13 14 template <typename GuardT> 15 class MOZ_RAII UnlockGuard; 16 17 template <typename Mutex> 18 class MOZ_RAII LockGuard { 19 friend class UnlockGuard<LockGuard<Mutex>>; 20 friend class ConditionVariable; 21 Mutex& mutex; 22 23 public: 24 explicit LockGuard(Mutex& mutex) : mutex(mutex) { lock(); } 25 ~LockGuard() { unlock(); } 26 27 LockGuard(const LockGuard& other) = delete; 28 29 protected: 30 void lock() { mutex.lock(); } 31 void unlock() { mutex.unlock(); } 32 }; 33 34 // RAII class to temporarily unlock a LockGuard. 35 template <typename GuardT> 36 class MOZ_RAII UnlockGuard { 37 GuardT& guard; 38 39 public: 40 explicit UnlockGuard(GuardT& guard) : guard(guard) { guard.unlock(); } 41 ~UnlockGuard() { guard.lock(); } 42 43 UnlockGuard(const UnlockGuard& other) = delete; 44 }; 45 46 } // namespace js 47 48 #endif // threading_LockGuard_h