What's wrong with this socket handling (receive blocks send)

[Laura T.]

Hi,

I've this kind a program, using sockets to communicate with the clients. One
of the clients can be a web browser (like IE).
When using IE as a client, the transmission blocks completely, and IE times
out after a long time while stating opening from http://localhost:7765...

I have a main thread that starts TCPListener and listens and accepts the
connection and queues a worker thread to handle the socket transmission:

loop
..
..
try
{
socket=_mainlis tener.AcceptSoc ket();
ThreadPool.Queu eUserWorkItem(< proc>,socket)

}
catch()
..
..
end loop

The worker thread starts with Receive and then sends a response and loops
over it until the socket is connected:

<init worker thread>
..
..
while(socket.Co nnected)
{
socket.Receive( buf,0,768,0);

[Laura T.]

Some missing details, the connection is TCP, the .NET framework is 1.1Sp1
and OS is Win2kSp4.

Laura

"Laura T." <laura_t@yahood otdotcom> ha scritto nel messaggio
news:O4******** ******@TK2MSFTN GP09.phx.gbl...

Hi,

I've this kind a program, using sockets to communicate with the clients.
One of the clients can be a web browser (like IE).
When using IE as a client, the transmission blocks completely, and IE
times out after a long time while stating opening from
http://localhost:7765...

I have a main thread that starts TCPListener and listens and accepts the
connection and queues a worker thread to handle the socket transmission:

loop
.
.
try
{
socket=_mainlis tener.AcceptSoc ket();
ThreadPool.Queu eUserWorkItem(< proc>,socket)

}
catch()
.
.
end loop

The worker thread starts with Receive and then sends a response and loops
over it until the socket is connected:

<init worker thread>
.
.
while(socket.Co nnected)
{
socket.Receive( buf,0,768,0);
.
<handle the request>
.
.
socket.Send(<re sponse>);
}

socket.Shutdown ();
socket.Close();

So I have a main thread listening the main port and spawning socket
handler threads thru thread pool.
Now, with IE, the worker thread flow goes well, it Receives() and Sends()
correctly. Then it goes back to Receive() -> BLOCKED.
IE waits and waits and waits. And finally times out. If I comment out the
loop so that after the Send i do Shutdown() and Close(), IE is happy. It
shows the page.
It seems that the Receive() blocks everything, so that IE cannot find out
if the data has been sent or cannot read the data, event that Send() says
it has sent all.

Am I misusing socket philosophy or is my threading model (passing socket
from thread to another) creating problems?
Any ideas?

Thanks,

Laura