144 lines
5.2 KiB
C++
144 lines
5.2 KiB
C++
// ******************************************************************
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// *
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// * .,-::::: .,:: .::::::::. .,:: .:
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// * ,;;;'````' `;;;, .,;; ;;;'';;' `;;;, .,;;
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// * [[[ '[[,,[[' [[[__[[\. '[[,,[['
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// * $$$ Y$$$P $$""""Y$$ Y$$$P
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// * `88bo,__,o, oP"``"Yo, _88o,,od8P oP"``"Yo,
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// * "YUMMMMMP",m" "Mm,""YUMMMP" ,m" "Mm,
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// *
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// * Cxbx->Win32->CxbxKrnl->EmuShared.cpp
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// *
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// * This file is part of the Cxbx project.
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// *
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// * Cxbx and Cxbe are free software; you can redistribute them
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// * and/or modify them under the terms of the GNU General Public
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// * License as published by the Free Software Foundation; either
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// * version 2 of the license, or (at your option) any later version.
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// *
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// * This program is distributed in the hope that it will be useful,
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// * but WITHOUT ANY WARRANTY; without even the implied warranty of
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// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// * GNU General Public License for more details.
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// *
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// * You should have recieved a copy of the GNU General Public License
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// * along with this program; see the file COPYING.
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// * If not, write to the Free Software Foundation, Inc.,
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// * 59 Temple Place - Suite 330, Bostom, MA 02111-1307, USA.
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// *
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// * (c) 2002-2003 Aaron Robinson <caustik@caustik.com>
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// *
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// * All rights reserved
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// *
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// ******************************************************************
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#define _CXBXKRNL_INTERNAL
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#define _XBOXKRNL_LOCAL_
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#include "EmuShared.h"
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#undef FIELD_OFFSET // prevent macro redefinition warnings
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#include <windows.h>
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#include <stdio.h>
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// ******************************************************************
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// * exported globals
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// ******************************************************************
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CXBXKRNL_API EmuShared *g_EmuShared = NULL;
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CXBXKRNL_API int g_EmuSharedRefCount = 0;
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// ******************************************************************
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// * static/global
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// ******************************************************************
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HANDLE hMapObject = NULL;
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// ******************************************************************
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// * func: EmuShared::EmuSharedInit
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// ******************************************************************
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CXBXKRNL_API void EmuShared::Init()
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{
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// ******************************************************************
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// * Ensure initialization only occurs once
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// ******************************************************************
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bool init = true;
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// ******************************************************************
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// * Prevent multiple initializations
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// ******************************************************************
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if(hMapObject != NULL)
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return;
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// ******************************************************************
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// * Create the shared memory "file"
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// ******************************************************************
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{
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hMapObject = CreateFileMapping
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(
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INVALID_HANDLE_VALUE, // Paging file
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NULL, // default security attributes
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PAGE_READWRITE, // read/write access
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0, // size: high 32 bits
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sizeof(EmuShared), // size: low 32 bits
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"Local\\EmuShared" // name of map object
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);
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if(hMapObject == NULL)
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return; // TODO: Fail gracefully
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if(GetLastError() == ERROR_ALREADY_EXISTS)
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init = false;
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}
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// ******************************************************************
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// * Memory map this file
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// ******************************************************************
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{
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g_EmuShared = (EmuShared*)MapViewOfFile
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(
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hMapObject, // object to map view of
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FILE_MAP_WRITE, // read/write access
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0, // high offset: map from
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0, // low offset: beginning
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0 // default: map entire file
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);
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if(g_EmuShared == NULL)
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return; // TODO: Fail gracefully
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}
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// ******************************************************************
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// * Executed only on first initialization of shared memory
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// ******************************************************************
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if(init)
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g_EmuShared->EmuShared::EmuShared();
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g_EmuSharedRefCount++;
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}
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// ******************************************************************
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// * func: EmuSharedCleanup
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// ******************************************************************
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CXBXKRNL_API void EmuShared::Cleanup()
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{
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g_EmuSharedRefCount--;
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if(g_EmuSharedRefCount == 0)
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g_EmuShared->EmuShared::~EmuShared();
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UnmapViewOfFile(g_EmuShared);
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}
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// ******************************************************************
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// * Constructor
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// ******************************************************************
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CXBXKRNL_API EmuShared::EmuShared()
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{
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m_XBController.Load("Software\\Cxbx\\XBController");
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}
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// ******************************************************************
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// * Deconstructor
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// ******************************************************************
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CXBXKRNL_API EmuShared::~EmuShared()
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{
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m_XBController.Save("Software\\Cxbx\\XBController");
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} |