historical/toontown-classic.git/panda/include/conditionVarSpinlockImpl.h
2024-01-16 11:20:27 -06:00

53 lines
1.3 KiB
C++

/**
* PANDA 3D SOFTWARE
* Copyright (c) Carnegie Mellon University. All rights reserved.
*
* All use of this software is subject to the terms of the revised BSD
* license. You should have received a copy of this license along
* with this source code in a file named "LICENSE."
*
* @file conditionVarSpinlockImpl.h
* @author drose
* @date 2006-04-11
*/
#ifndef CONDITIONVARSPINLOCKIMPL_H
#define CONDITIONVARSPINLOCKIMPL_H
#include "pandabase.h"
#include "selectThreadImpl.h"
#ifdef MUTEX_SPINLOCK
#include "mutexSpinlockImpl.h"
#include "pnotify.h"
#include "atomicAdjust.h"
class MutexSpinlockImpl;
/**
* Uses a simple user-space spinlock to implement a condition variable. It is
* usually not a good idea to use this implementation, unless you are building
* Panda for a specific application on a specific SMP machine, and you are
* confident that you have at least as many CPU's as you have threads.
*/
class EXPCL_PANDA_PIPELINE ConditionVarSpinlockImpl {
public:
INLINE ConditionVarSpinlockImpl(MutexSpinlockImpl &mutex);
INLINE ~ConditionVarSpinlockImpl();
void wait();
void wait(double timeout);
INLINE void notify();
INLINE void notify_all();
private:
MutexSpinlockImpl &_mutex;
TVOLATILE AtomicAdjust::Integer _event;
};
#include "conditionVarSpinlockImpl.I"
#endif // MUTEX_SPINLOCK
#endif