Calling same method from separate threads

[steg90]

Hi,

I have a function called GetMessageDetail which returns a pointer to a structure. This method is called from two separate threads, the function is as follows :

PASSTHRU_MSG* QTCanMonitor::GetMessageDetail( unsigned long *pulNumMsgs, int iChannelIndex )
{
	unsigned long ulTimeout = 0;
	int iReply = -1;
 
	if( m_pPassThruReadMsgs && m_bConnected )
	{
		iReply = (m_pPassThruReadMsgs)( m_lChannelID[iChannelIndex], m_CanMsg, pulNumMsgs, ulTimeout );
		if( iReply == -1 )
		{
			return NULL;
		}
	}
	else
		return NULL;
	return m_CanMsg;
}

PASSTHRU_MSG* QTCanMonitor::GetMessageDetail( unsigned long *pulNumMsgs, int iChannelIndex )
{
	unsigned long ulTimeout = 0;
	int iReply = -1;

	if( m_pPassThruReadMsgs && m_bConnected )
	{
		iReply = (m_pPassThruReadMsgs)( m_lChannelID[iChannelIndex], m_CanMsg, pulNumMsgs, ulTimeout );
		if( iReply == -1 )
		{
			return NULL;
		}
	}
	else
		return NULL;
	return m_CanMsg;
}

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What would be the best way to make sure this method is not accessed by the two threads at the same time? Would a QMutex be ok?

Thanks,
Steve