C / C++ / MFC

// Program needs to create a Mutex for Scripting shared memory access<br />
g_hMainMutex = ::CreateMutex(	NULL,<br />
				FALSE,<br />
				"CSL_SharedMemLock" <br />
                            );<br />
<br />
// Libray needs to create a Mutex for library shared memory access<br />
g_hLibMutex = ::CreateMutex(	NULL,<br />
				FALSE,<br />
				"Lib_SharedMemLock" <br />
                            );

bool CMain_ExampleDlg::WaitForMutex(HANDLE mutex)<br />
{<br />
/* This procedure will wait for (250 millseconds) before allowing any<br />
   write access to the shared area.	*/<br />
<br />
        static HANDLE ssicMutex = NULL;<br />
	bool returnValue = false;<br />
<br />
	int waitReturn = ::WaitForSingleObject(mutex,250);<br />
	if(mutex)<br />
	{<br />
		if (waitReturn == WAIT_OBJECT_0)<br />
		{<br />
			returnValue = true;  // All OK<br />
		}<br />
		else   // Did not get mutex<br />
		{<br />
			// Failed to get handle increment the error count<br />
			if(mutex == g_hSSICMutex)<br />
				g_pMainMap->failedMutex++;<br />
			else<br />
				g_pLibMap->failedMutex++;<br />
			returnValue = true; // this should be FALSE !!!!<br />
		}<br />
	}<br />
	::ReleaseMutex(mutex);<br />
	return returnValue;	<br />
}