Monitor.h (1556B)
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 vm_Monitor_h 8 #define vm_Monitor_h 9 10 #include "threading/ConditionVariable.h" 11 #include "threading/Mutex.h" 12 13 namespace js { 14 15 // A base class used for types intended to be used in a parallel 16 // fashion. Combines a lock and a condition variable. You can 17 // acquire the lock or signal the condition variable using the 18 // |AutoLockMonitor| type. 19 20 class Monitor { 21 protected: 22 friend class AutoLockMonitor; 23 24 Mutex lock_ MOZ_UNANNOTATED; 25 ConditionVariable condVar_; 26 27 public: 28 explicit Monitor(const MutexId& id) : lock_(id) {} 29 }; 30 31 class AutoLockMonitor : public LockGuard<Mutex> { 32 private: 33 using Base = LockGuard<Mutex>; 34 Monitor& monitor; 35 36 public: 37 explicit AutoLockMonitor(Monitor& monitor) 38 : Base(monitor.lock_), monitor(monitor) {} 39 40 bool isFor(Monitor& other) const { return &monitor.lock_ == &other.lock_; } 41 42 void wait(ConditionVariable& condVar) { condVar.wait(*this); } 43 44 void wait() { wait(monitor.condVar_); } 45 46 void notify(ConditionVariable& condVar) { condVar.notify_one(); } 47 48 void notify() { notify(monitor.condVar_); } 49 50 void notifyAll(ConditionVariable& condVar) { condVar.notify_all(); } 51 52 void notifyAll() { notifyAll(monitor.condVar_); } 53 }; 54 55 } // namespace js 56 57 #endif /* vm_Monitor_h */