QT4 and GLib

[wysota]

I don't know if you are aware of this, but the thread object and its members live not in the thread executed by its run() method but in the thread that created the QThread subclassed object (hence the socket lives in a different thread than the one operating on it). I don't know if it's important here, but it seems to be that you are not aware of that.

[pdoria]

Well, I'm sorry to say this but you have somewhat severe threading issues there. I strongly recommend reading Multithreading slides from TT DevDays2007 starting from page 33, about thread affinity.

Thanks for the link. I'll look into it.

Could you please elaborate on "somewhat severe threading issues there"?
My noobiness at Qt doesn't allow me to see it at first glance...
Where do you see them?

Regards,
Pedro.

[wysota]

J-P probably means the same I noticed.

[pdoria]

I don't know if you are aware of this, but the thread object and its members live not in the thread executed by its run() method but in the thread that created the QThread subclassed object (hence the socket lives in a different thread than the one operating on it). I don't know if it's important here, but it seems to be that you are not aware of that.

Thanks for the heads-up!

I must confess that at first reading I almost got baffled with your input!
Well... what's wrong with using the socket coming from

class Server : public QTcpServer
{
		Q_OBJECT
 
	public:
		unsigned int nbrClients;
		Server ( QObject *parent = 0 );
 
	protected:
		void incomingConnection ( int socketDescriptor );
};

class Server : public QTcpServer
{
		Q_OBJECT

	public:
		unsigned int nbrClients;
		Server ( QObject *parent = 0 );

	protected:
		void incomingConnection ( int socketDescriptor );
};

To copy to clipboard, switch view to plain text mode 

?

and then passing it to

myUnit *tunit = new myUnit ( socketDescriptor,this );

myUnit *tunit = new myUnit ( socketDescriptor,this );

To copy to clipboard, switch view to plain text mode 

I mean... I have no other discernible way of passing the socket to the thread...

ADDENDUM:
I create the socket in

class myUnit : public QThread
{
Q_OBJECT
 
public:
QTcpSocket tcpSocket;
}

class myUnit : public QThread
{
Q_OBJECT

public:
QTcpSocket tcpSocket;
}

To copy to clipboard, switch view to plain text mode 

and in

myUnit::myUnit ( int socketDescriptor, Server *parent ) : QThread ( parent )
{
	// initialize the unit's socket --> provided by Server::incomingConnection()
	if ( !tcpSocket.setSocketDescriptor ( socketDescriptor ) )
	{
		emit error ( tcpSocket.error() );
		return;
	}
}

myUnit::myUnit ( int socketDescriptor, Server *parent ) : QThread ( parent )
{
	// initialize the unit's socket --> provided by Server::incomingConnection()
	if ( !tcpSocket.setSocketDescriptor ( socketDescriptor ) )
	{
		emit error ( tcpSocket.error() );
		return;
	}
}

To copy to clipboard, switch view to plain text mode 

I set its descriptor coming from Server::incomingConnection() ...
What could possibly be wrong with this?

Thanks,
Pedro.

[wysota]

You have to create the socket in run() or change its affinity (just remember the thread object can't be its parent then, so you'll have to explicitely call delete on the socket).