61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Copyright (c) 1998, Microsoft Corp. All rights reserved.
|
|
//
|
|
// FILE
|
|
//
|
|
// Perimeter.h
|
|
//
|
|
// SYNOPSIS
|
|
//
|
|
// This file describes the class Perimeter.
|
|
//
|
|
// MODIFICATION HISTORY
|
|
//
|
|
// 09/04/1997 Original version.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef _PERIMETER_H_
|
|
#define _PERIMETER_H_
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// CLASS
|
|
//
|
|
// Perimeter
|
|
//
|
|
// DESCRIPTION
|
|
//
|
|
// This class implements a Perimeter synchronization object. Threads
|
|
// may request either exclusive or shared access to the protected area.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
class Perimeter
|
|
{
|
|
public:
|
|
Perimeter() throw ();
|
|
~Perimeter() throw ();
|
|
|
|
void Lock() throw ();
|
|
void LockExclusive() throw ();
|
|
void Unlock() throw ();
|
|
|
|
protected:
|
|
LONG sharing; // Number of threads sharing the perimiter.
|
|
LONG waiting; // Number of threads waiting for shared access.
|
|
PLONG count; // Pointer to either sharing or waiting depending
|
|
// on the current state of the perimiter.
|
|
|
|
CRITICAL_SECTION exclusive; // Synchronizes exclusive access.
|
|
HANDLE sharedOK; // Wakes up threads waiting for shared.
|
|
HANDLE exclusiveOK; // Wakes up threads waiting for exclusive.
|
|
|
|
private:
|
|
// Not implemented.
|
|
Perimeter(const Perimeter&) throw ();
|
|
Perimeter& operator=(const Perimeter&) throw ();
|
|
};
|
|
|
|
#endif // _PERIMETER_H_
|