135 lines
3.0 KiB
C++
135 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_Monitor_h
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#define mozilla_Monitor_h
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#include "mozilla/CondVar.h"
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#include "mozilla/Mutex.h"
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namespace mozilla {
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/**
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* Monitor provides a *non*-reentrant monitor: *not* a Java-style
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* monitor. If your code needs support for reentrancy, use
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* ReentrantMonitor instead. (Rarely should reentrancy be needed.)
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*
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* Instead of directly calling Monitor methods, it's safer and simpler
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* to instead use the RAII wrappers MonitorAutoLock and
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* MonitorAutoUnlock.
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*/
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class Monitor
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{
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public:
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explicit Monitor(const char* aName)
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: mMutex(aName)
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, mCondVar(mMutex, "[Monitor.mCondVar]")
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{
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}
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~Monitor() {}
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void Lock() { mMutex.Lock(); }
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void Unlock() { mMutex.Unlock(); }
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nsresult Wait(PRIntervalTime aInterval = PR_INTERVAL_NO_TIMEOUT)
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{
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return mCondVar.Wait(aInterval);
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}
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nsresult Notify() { return mCondVar.Notify(); }
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nsresult NotifyAll() { return mCondVar.NotifyAll(); }
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void AssertCurrentThreadOwns() const
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{
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mMutex.AssertCurrentThreadOwns();
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}
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void AssertNotCurrentThreadOwns() const
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{
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mMutex.AssertNotCurrentThreadOwns();
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}
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private:
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Monitor();
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Monitor(const Monitor&);
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Monitor& operator=(const Monitor&);
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Mutex mMutex;
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CondVar mCondVar;
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};
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/**
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* Lock the monitor for the lexical scope instances of this class are
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* bound to (except for MonitorAutoUnlock in nested scopes).
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*
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* The monitor must be unlocked when instances of this class are
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* created.
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*/
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class MOZ_STACK_CLASS MonitorAutoLock
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{
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public:
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explicit MonitorAutoLock(Monitor& aMonitor)
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: mMonitor(&aMonitor)
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{
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mMonitor->Lock();
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}
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~MonitorAutoLock()
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{
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mMonitor->Unlock();
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}
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nsresult Wait(PRIntervalTime aInterval = PR_INTERVAL_NO_TIMEOUT)
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{
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return mMonitor->Wait(aInterval);
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}
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nsresult Notify() { return mMonitor->Notify(); }
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nsresult NotifyAll() { return mMonitor->NotifyAll(); }
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private:
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MonitorAutoLock();
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MonitorAutoLock(const MonitorAutoLock&);
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MonitorAutoLock& operator=(const MonitorAutoLock&);
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static void* operator new(size_t) CPP_THROW_NEW;
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Monitor* mMonitor;
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};
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/**
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* Unlock the monitor for the lexical scope instances of this class
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* are bound to (except for MonitorAutoLock in nested scopes).
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*
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* The monitor must be locked by the current thread when instances of
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* this class are created.
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*/
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class MOZ_STACK_CLASS MonitorAutoUnlock
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{
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public:
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explicit MonitorAutoUnlock(Monitor& aMonitor)
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: mMonitor(&aMonitor)
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{
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mMonitor->Unlock();
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}
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~MonitorAutoUnlock()
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{
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mMonitor->Lock();
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}
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private:
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MonitorAutoUnlock();
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MonitorAutoUnlock(const MonitorAutoUnlock&);
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MonitorAutoUnlock& operator=(const MonitorAutoUnlock&);
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static void* operator new(size_t) CPP_THROW_NEW;
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Monitor* mMonitor;
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};
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} // namespace mozilla
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#endif // mozilla_Monitor_h
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