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Initial commit of Command & Conquer Renegade source code.

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LFeenanEA
2025-02-27 16:39:46 +00:00
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commit 58ed459113
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Code/Commando/singletoninstancekeeper.cpp Normal file
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/*
** Command & Conquer Renegade(tm)
** Copyright 2025 Electronic Arts Inc.
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/***********************************************************************************************
*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
***********************************************************************************************
* *
* Project Name : commando *
* *
* $Archive:: /Commando/Code/Commando/singletoninstancekeeper.cpp $*
* *
* Author:: Patrick Smith *
* *
* $Modtime:: 11/29/01 1:05p $*
* *
* $Revision:: 4 $*
* *
*---------------------------------------------------------------------------------------------*
* Functions: *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include "singletoninstancekeeper.h"
#include "wwdebug.h"
#include "autostart.h"
//
// Disable 'unreferenced inline function has been removed'
//
#pragma warning(disable : 4514)
//////////////////////////////////////////////////////////////////////
// Local constants
//////////////////////////////////////////////////////////////////////
static const char * AUTOPLAY_GUID = "01AF9993-3492-11d3-8F6F-0060089C05B1";
//////////////////////////////////////////////////////////////////////
// Static member initialization
//////////////////////////////////////////////////////////////////////
const char * SingletonInstanceKeeperClass::APP_GUID = "C6D925A3-7A9B-4ca3-866D-8B4D506C3665";
bool SingletonInstanceKeeperClass::AllowMultipleInstances = false;
//////////////////////////////////////////////////////////////////////
//
// SingletonInstanceKeeperClass
//
//////////////////////////////////////////////////////////////////////
SingletonInstanceKeeperClass::SingletonInstanceKeeperClass (void) :
AppMutex (NULL),
AutoPlayMutex (NULL)
{
if (AutoRestart.Get_Restart_Flag()) {
AllowMultipleInstances = true;
}
return;
}
//////////////////////////////////////////////////////////////////////
//
// SingletonInstanceKeeperClass
//
//////////////////////////////////////////////////////////////////////
SingletonInstanceKeeperClass::~SingletonInstanceKeeperClass (void)
{
if (AppMutex != NULL) {
::CloseHandle (AppMutex);
}
if (AutoPlayMutex != NULL) {
::CloseHandle (AutoPlayMutex);
}
return;
}
//////////////////////////////////////////////////////////////////////
//
// Verify_Safe_To_Execute
//
//////////////////////////////////////////////////////////////////////
bool
SingletonInstanceKeeperClass::Verify_Safe_To_Execute (void)
{
bool retval = false;
//
// Create a mutex with a unique name to Renegade in order to determine if
// our app is already running.
//
// WARNING: DO NOT use this number for any other application except Renegade
//
AppMutex = ::CreateMutex (NULL, FALSE, APP_GUID);
//
// Is there already an instance of this app somewhere?
//
if (::GetLastError () == ERROR_ALREADY_EXISTS) {
if (AllowMultipleInstances) {
WWDEBUG_SAY (("Renegade is already running but AllowMultipleInstances is true\n"));
retval = true;
} else {
//
// Find the previous instance
//
HWND main_wnd = ::FindWindow (APP_GUID, NULL);
if (main_wnd != NULL) {
::SetForegroundWindow (main_wnd);
::ShowWindow (main_wnd, SW_RESTORE);
}
WWDEBUG_SAY (("Renegade is already running...Bail!\n"));
}
} else {
WWDEBUG_SAY (("Create AppMutex okay.\n"));
//
// Obtain the mutex unique to the Renegade AutoPlay application.
//
// WARNING: DO NOT use this number for any other application except Renegade AutoPlay
//
do
{
//
// Attempt to open the mutex
//
AutoPlayMutex = ::OpenMutex (MUTEX_ALL_ACCESS, FALSE, AUTOPLAY_GUID);
if (AutoPlayMutex != NULL) {
WWDEBUG_SAY (("Waiting for Autoplay to quit!\n"));
//
// Wait for up to 30 seconds for the autoplay app to close
//
if (::WaitForSingleObject (AutoPlayMutex, 30000) == WAIT_FAILED) {
WWDEBUG_SAY (("Failed waiting for AutoPlayMutex\n"));
::CloseHandle (AutoPlayMutex);
AutoPlayMutex = NULL;
}
}
//
// Create a mutex with a name unique to the Renegade AutoPlay application.
// This prevents the autoplay from running since it cannot get the mutex.
// Renegade needs both of these mutexs before it is allowed to run.
//
if (AutoPlayMutex == NULL) {
AutoPlayMutex = ::CreateMutex (NULL, FALSE, AUTOPLAY_GUID);
if (::GetLastError () == ERROR_ALREADY_EXISTS) {
::CloseHandle (AutoPlayMutex);
AutoPlayMutex = NULL;
::Sleep (2500);
} else {
WWDEBUG_SAY (("Create AutoPlayMutex.\n"));
}
}
} while (AutoPlayMutex == NULL);
WWDEBUG_SAY (("Got AutoPlayMutex okay.\n"));
retval = true;
}
return retval;
}
//////////////////////////////////////////////////////////////////////
//
// Allow_Multiple_Instances
//
//////////////////////////////////////////////////////////////////////
void SingletonInstanceKeeperClass::Allow_Multiple_Instances(bool flag)
{
AllowMultipleInstances = flag;
}