[C++] WaitCommEvent

Bonjour :)
J'ai un p'tit soucis que j'ai assez bien cerné mais je ne vois pas comment passé outre

Voilà mon code:

void CS8Dlg::initialisation() 
{
	HANDLE hCom1,hCom4; 
	OVERLAPPED o,q; 
	DWORD dwEvtMask1,dwEvtMask4; 
	DCB dcb; 
	BOOL fSuccess1,fSuccess4; 

		// OPEN THE SERIAL 1
hCom1 = CreateFile( 
	TEXT("COM1"),
	GENERIC_READ | GENERIC_WRITE, 
	0, 							// must be opened with exclusive-access 
	NULL, 						// default security attributes 
	OPEN_EXISTING,				// must use OPEN_EXISTING
	0, 							// not overlapped I/O 
	NULL 						// hTemplate must be NULL for comm devices 
	);

		// OPEN THE SERIAL 4
hCom4 = CreateFile( 
	TEXT("COM4"), 
	GENERIC_READ | GENERIC_WRITE, 
	0, 							// must be opened with exclusive-access 
	NULL, 						// default security attributes 
	OPEN_EXISTING,				// must use OPEN_EXISTING
	0, 							// not overlapped I/O 
	NULL 						// hTemplate must be NULL for comm devices 
	);

if (hCom1 == INVALID_HANDLE_VALUE || hCom4 == INVALID_HANDLE_VALUE ) 
	{ 
		return; // You're divises are not correctly linked
	} 

SetupComm(hCom1,5000,5000); 
SetupComm(hCom4,5000,5000); 

fSuccess1 = GetCommState(hCom1, &dcb); 
fSuccess4 = GetCommState(hCom4, &dcb); 

if (!fSuccess1 || !fSuccess4) 
	{
		return; // No communication with your modules
	} 

	// CONFIGURE THE SERIAL COMMUNICATION

	// Fill in DCB: 9	,600 bps, 8 data bits, no parity, and 1 stop bit. 
dcb.BaudRate = CBR_9600;		// set the baud rate 
dcb.ByteSize = 8;				// data size, xmit, and rcv 
dcb.Parity   = NOPARITY;		// no parity bit 
dcb.StopBits = ONESTOPBIT;		// one stop bit 
dcb.fNull=FALSE;
dcb.fRtsControl=RTS_CONTROL_ENABLE;
dcb.fInX=FALSE;
dcb.fOutX=FALSE;
dcb.fDtrControl=DTR_CONTROL_ENABLE; 

SetCommState(hCom1,&dcb); 
SetCommState(hCom4,&dcb); 
if (!SetCommState(hCom1,&dcb) || !SetCommState(hCom4,&dcb))
	{
		return; //Problem with the configuration of the serial communication
	} 


fSuccess1 = SetCommMask(hCom1, EV_DSR); 
fSuccess4 = SetCommMask(hCom4, EV_DSR); 
if (!fSuccess1 || !fSuccess4) 
	{ 
		return; // Problem with the actual states of the modules
	} 


// Create an event object for use by WaitCommEvent. 
o.hEvent = CreateEvent( 
NULL,	// default security attributes 
TRUE,	// manual-reset event 
FALSE,	// not signaled 
NULL	// no name 
); 
// Create an event object for use by WaitCommEvent. 
q.hEvent = CreateEvent( 
NULL,	// default security attributes 
TRUE,	// manual-reset event 
FALSE,	// not signaled 
NULL	// no name 
); 


// Initialize the rest of the OVERLAPPED structure to zero. 
 o.Internal = 0;
 o.InternalHigh = 0;
 o.Offset = 0;
 o.OffsetHigh = 0;
 assert(o.hEvent);
 	
 // Initialize the rest of the OVERLAPPED structure to zero. 
 q.Internal = 0;
 q.InternalHigh = 0;
 q.Offset = 0;
 q.OffsetHigh = 0;
 assert(q.hEvent);

 if (WaitCommEvent(hCom1, &dwEvtMask1, &o) || WaitCommEvent(hCom4, &dwEvtMask4, &q)) 
	{
 	if (dwEvtMask1 & EV_DSR) 
		{ 
	//DO UN TRUC
		} 
	if (dwEvtMask4 & EV_DSR) 
		{ 
	//DO UN autre TRUC
		} 
	}
	return;
}

Mon problème et vous l'aurez peut être compris, c'est que mon if (WaitCommEvent || WaitCommEvent) dès qu'un des deux évènements se passe (soit sur COM 1 soit sur COM 4) il s'arrête sur le premier if.
En faite j'aimerais qu'ils attendent un évènement de la part de COM 1 ou COM 4 et qu'une fois que l'évènement a eu lieu, qu'il test if (dwEvtMask1 & EV_DSR) ET if (dwEvtMask4 & EV_DSR)
bref quand je titille mon COM 1 il DO UN TRUC, quand je titille mon COM 4 il attend bêtement au niveau du if (dwEvtMask1 & EV_DSR) ...

J'ai peur de devoir utiliser un thread :(

Une idée ?
Merci:)