Line data    Source code

       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       32775 :   explicit LockGuard(Mutex& aLock)
      23       32775 :     : lock(aLock)
      24             :   {
      25       32775 :     lock.lock();
      26       32775 :   }
      27             : 
      28       32739 :   ~LockGuard() {
      29       32739 :     lock.unlock();
      30       32739 :   }
      31             : };
      32             : 
      33             : template <typename Mutex>
      34             : class MOZ_RAII UnlockGuard
      35             : {
      36             :   Mutex& lock;
      37             : 
      38             : public:
      39          56 :   explicit UnlockGuard(LockGuard<Mutex>& aGuard)
      40          56 :     : lock(aGuard.lock)
      41             :   {
      42          56 :     lock.unlock();
      43          56 :   }
      44             : 
      45          55 :   ~UnlockGuard() {
      46          55 :     lock.lock();
      47          55 :   }
      48             : };
      49             : 
      50             : } // namespace js
      51             : 
      52             : #endif // threading_LockGuard_h