зеркало из https://github.com/mozilla/pjs.git
192 строки
4.9 KiB
C++
192 строки
4.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=8 et :
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Code.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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* Portions created by the Initial Developer are Copyrigght (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Jones <jones.chris.g@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 NS_COM_GLUE Monitor
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{
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public:
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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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~Monitor() {}
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void Lock()
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{
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mMutex.Lock();
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}
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void Unlock()
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{
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mMutex.Unlock();
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}
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nsresult Wait(PRIntervalTime interval = PR_INTERVAL_NO_TIMEOUT)
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{
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return mCondVar.Wait(interval);
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}
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nsresult Notify()
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{
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return mCondVar.Notify();
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}
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nsresult NotifyAll()
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{
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return mCondVar.NotifyAll();
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}
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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 NS_COM_GLUE NS_STACK_CLASS MonitorAutoLock
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{
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public:
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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 interval = PR_INTERVAL_NO_TIMEOUT)
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{
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return mMonitor->Wait(interval);
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}
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nsresult Notify()
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{
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return mMonitor->Notify();
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}
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nsresult NotifyAll()
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{
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return mMonitor->NotifyAll();
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}
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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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static void operator delete(void*);
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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 NS_COM_GLUE NS_STACK_CLASS MonitorAutoUnlock
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{
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public:
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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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static void operator delete(void*);
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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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