зеркало из https://github.com/mozilla/gecko-dev.git
144 строки
3.2 KiB
C++
144 строки
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_Monitor_h
|
|
#define mozilla_Monitor_h
|
|
|
|
#include "mozilla/CondVar.h"
|
|
#include "mozilla/Mutex.h"
|
|
|
|
namespace mozilla {
|
|
|
|
/**
|
|
* Monitor provides a *non*-reentrant monitor: *not* a Java-style
|
|
* monitor. If your code needs support for reentrancy, use
|
|
* ReentrantMonitor instead. (Rarely should reentrancy be needed.)
|
|
*
|
|
* Instead of directly calling Monitor methods, it's safer and simpler
|
|
* to instead use the RAII wrappers MonitorAutoLock and
|
|
* MonitorAutoUnlock.
|
|
*/
|
|
class Monitor
|
|
{
|
|
public:
|
|
explicit Monitor(const char* aName)
|
|
: mMutex(aName)
|
|
, mCondVar(mMutex, "[Monitor.mCondVar]")
|
|
{
|
|
}
|
|
|
|
~Monitor() {}
|
|
|
|
void Lock() { mMutex.Lock(); }
|
|
void Unlock() { mMutex.Unlock(); }
|
|
|
|
nsresult Wait(PRIntervalTime aInterval = PR_INTERVAL_NO_TIMEOUT)
|
|
{
|
|
return mCondVar.Wait(aInterval);
|
|
}
|
|
|
|
nsresult Notify() { return mCondVar.Notify(); }
|
|
nsresult NotifyAll() { return mCondVar.NotifyAll(); }
|
|
|
|
void AssertCurrentThreadOwns() const
|
|
{
|
|
mMutex.AssertCurrentThreadOwns();
|
|
}
|
|
|
|
void AssertNotCurrentThreadOwns() const
|
|
{
|
|
mMutex.AssertNotCurrentThreadOwns();
|
|
}
|
|
|
|
private:
|
|
Monitor();
|
|
Monitor(const Monitor&);
|
|
Monitor& operator=(const Monitor&);
|
|
|
|
Mutex mMutex;
|
|
CondVar mCondVar;
|
|
};
|
|
|
|
/**
|
|
* Lock the monitor for the lexical scope instances of this class are
|
|
* bound to (except for MonitorAutoUnlock in nested scopes).
|
|
*
|
|
* The monitor must be unlocked when instances of this class are
|
|
* created.
|
|
*/
|
|
class MOZ_STACK_CLASS MonitorAutoLock
|
|
{
|
|
public:
|
|
explicit MonitorAutoLock(Monitor& aMonitor)
|
|
: mMonitor(&aMonitor)
|
|
{
|
|
mMonitor->Lock();
|
|
}
|
|
|
|
~MonitorAutoLock()
|
|
{
|
|
mMonitor->Unlock();
|
|
}
|
|
|
|
nsresult Wait(PRIntervalTime aInterval = PR_INTERVAL_NO_TIMEOUT)
|
|
{
|
|
return mMonitor->Wait(aInterval);
|
|
}
|
|
|
|
nsresult Notify() { return mMonitor->Notify(); }
|
|
nsresult NotifyAll() { return mMonitor->NotifyAll(); }
|
|
|
|
private:
|
|
MonitorAutoLock();
|
|
MonitorAutoLock(const MonitorAutoLock&);
|
|
MonitorAutoLock& operator=(const MonitorAutoLock&);
|
|
static void* operator new(size_t) CPP_THROW_NEW;
|
|
|
|
friend class MonitorAutoUnlock;
|
|
|
|
Monitor* mMonitor;
|
|
};
|
|
|
|
/**
|
|
* Unlock the monitor for the lexical scope instances of this class
|
|
* are bound to (except for MonitorAutoLock in nested scopes).
|
|
*
|
|
* The monitor must be locked by the current thread when instances of
|
|
* this class are created.
|
|
*/
|
|
class MOZ_STACK_CLASS MonitorAutoUnlock
|
|
{
|
|
public:
|
|
explicit MonitorAutoUnlock(Monitor& aMonitor)
|
|
: mMonitor(&aMonitor)
|
|
{
|
|
mMonitor->Unlock();
|
|
}
|
|
|
|
explicit MonitorAutoUnlock(MonitorAutoLock& aMonitorLock)
|
|
: mMonitor(aMonitorLock.mMonitor)
|
|
{
|
|
mMonitor->Unlock();
|
|
}
|
|
|
|
~MonitorAutoUnlock()
|
|
{
|
|
mMonitor->Lock();
|
|
}
|
|
|
|
private:
|
|
MonitorAutoUnlock();
|
|
MonitorAutoUnlock(const MonitorAutoUnlock&);
|
|
MonitorAutoUnlock& operator=(const MonitorAutoUnlock&);
|
|
static void* operator new(size_t) CPP_THROW_NEW;
|
|
|
|
Monitor* mMonitor;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_Monitor_h
|