Source code of Windows XP (NT5)
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//#pragma title( "TSync.cpp - Common synchronization classes" )
/*
Copyright (c) 1995-1998, Mission Critical Software, Inc. All rights reserved.
===============================================================================
Module - TSync.cpp
System - Common
Author - Rich Denham
Created - 1996-11-08
Description - Common synchronization classes
TCriticalSection
TSemaphoreNamed
Updates -
===============================================================================
*/
#include <stdio.h>
#ifdef USE_STDAFX
# include "stdafx.h"
#else
# include <windows.h>
#endif
#include <time.h>
#include "Common.hpp"
#include "Err.hpp"
#include "TSync.hpp"
///////////////////////////////////////////////////////////////////////////////
// TSemaphoreNamed member functions
///////////////////////////////////////////////////////////////////////////////
// Create named semaphore
DWORD // ret-OS return code
TSemaphoreNamed::Create(
TCHAR const * sNameT ,// in -semaphore name
DWORD nInitial ,// in -initial count
DWORD nMaximum ,// in -maximum count
BOOL * pbExisted // out-TRUE=previously existed
)
{
DWORD rcOs=0; // OS return code
handle = CreateSemaphore( NULL, nInitial, nMaximum, sNameT );
if ( handle == NULL )
{
rcOs = GetLastError();
}
else if ( pbExisted )
{
rcOs = GetLastError();
switch ( rcOs )
{
case 0:
*pbExisted = FALSE;
break;
case ERROR_ALREADY_EXISTS:
*pbExisted = TRUE;
rcOs = 0;
break;
default:
break;
}
}
return rcOs;
}
// Open named semaphore
DWORD // ret-OS return code
TSemaphoreNamed::Open(
TCHAR const * sNameT // in -semaphore name
)
{
DWORD rcOs=0; // OS return code
handle = OpenSemaphore( SEMAPHORE_ALL_ACCESS, FALSE, sNameT );
if ( handle == NULL ) rcOs = GetLastError();
return rcOs;
}
// Release semaphore
DWORD // ret-OS return code
TSemaphoreNamed::Release(
long nRelease // in -number to release
)
{
DWORD rcOs; // OS return code
long nPrevious=0; // previous count
rcOs = ReleaseSemaphore( Handle(), nRelease, &nPrevious )
? 0 : GetLastError();
return rcOs;
}
// TSync.cpp - end of file