hi,
i have a real problem with the socket based communication of our
client-server application.
the application (c# .net 1.1) works well for all of our customers
except one.

i encounter socket exceptions in arbitrary intervals on this site (once
or twice a day).
the exception occurs on a socket.Send call and it states:

System.InvalidOperationException: Cannot block a call on this socket,
while an earlier async one is in progress.
at System.Net.Sockets.Socket.ValidateBlockingMode()
at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32
size, SocketFlags socketFlags)
at ComWin.TcpLib.CWTcpReceiver.SendRaw(Byte[] data, Int32 size)

I haven't got a clue how to track down this error. I have tried to
reproduce the failure but had no luck.

maybe somebody can give me a hint what can cause this error or what can
be done to locate the failure ...

Can you post the code inside your SendRaw method?

--
Bryan Phillips
MCSD, MCDBA, MCSE
Blog: http://bphillips76.spaces.live.com



"bogma" <m.bogensperger (AT) commend (DOT) com> wrote

Hi Bryan,
the SendRaw code block is locked, so that only one thread can send.

public bool SendRaw(byte[] data, int size)
{
lock (m_sendlock)
{
if (m_socket != null)
{
if (data != null && size > 0)
{
try
{
int totalsent = 0;
do
{
int sent = m_socket.Send(data, totalsent, size - totalsent,
SocketFlags.None);
totalsent += sent;
} while (totalsent < size);
return true;
}
catch (Exception ex)
{
_log.Error("Error in CWTcpReceiver::Send:", ex);
}
}
}
}
return false;
}

What value are you setting to m_sendlock? It will need to be unique for
each thread.

--
Bryan Phillips
MCSD, MCDBA, MCSE
Blog: http://bphillips76.spaces.live.com



"bogma" <m.bogensperger (AT) commend (DOT) com> wrote