The following code behaves differently from what I would expect:
socket = new Socket(AddressF amily.InterNetw ork, SocketType.Stre am,
System.Net.Sock ets.ProtocolTyp e.Tcp);
socket.Blocking = false;
socket.Connect( ipe);
isConnected = socket.Poll(30* 1000000, SelectMode.Sele ctWrite);
I would have expected that once I set the socket to non-blocking, the
connect would return immediately and the poll would wait up to 30 seconds
for the connect to succeed.
Instead, what I see is that after 10 or so seconds, the Connect() throws a
SocketException ("A non-blocking socket operation could not be completed
immediately").
Am I misunderstandin g the documentation? Help would be appreciated.
Joe 4 16829
Hi,
1. "A non-blocking socket operation could not be completed immediately" is
the WSAEWOULDBLOCK error. It is normal for WSAEWOULDBLOCK to be reported as
the result from calling connect on a non-blocking socket, since some time
must elapse for the connection to be established. For detailed information,
please refer to MSDN on "connect" at: http://msdn.microsoft.com/library/de...us/winsock/win
sock/connect_2.asp
2. In .NET, you can use asynchronous socket calls alternatively. Please
refer to MSDN documentation on Socket.BeginCon nect and Socket.EndConne ct
methods. I believe the following articles and samples are very helpful:
Using an Asynchronous Client Socket http://msdn.microsoft.com/library/de...us/cpguide/htm
l/cpconusingnon-blockingclients ocket.asp?frame =true
Using an Asynchronous Server Socket http://msdn.microsoft.com/library/de...us/cpguide/htm
l/cpconusingnon-blockingservers ocket.asp?frame =true
Please feel free to let me know if you have any problems or concens.
Have a nice day!
Regards,
HuangTM
This posting is provided "AS IS" with no warranties, and confers no rights.
This is very helpful. If you don't mind, I do however, have a couple more
questions. I chose not the use the asynchronous calls since it requires a
callback, which adds unneeded complexity to what is otherwise a very simple
problem. If I was writing directly to winsock, I would implement it roughly
as I outlined in my post. I have two concerns with doing this in .Net: 1)
the Connect() call does not return immediately but inexplicably seems to
take several seconds, and 2) I'm concerned about the overhead of relying on
a SocketException being thrown then caught for each socket connection I
make.
If you have advice, it would be appreciated.
Joe
On Wed, 9 Jul 2003 08:26:58 -0400, "Joe Kinsella" <jk*******@silv erbacktech.com>
wrote: 2) I'm concerned about the overhead of relying on a SocketException being thrown then caught for each socket connection I make.
How many connections do you intend to establish each second?
--
Abderaware
Fine Components For .NET
Turn on, tune in, download.
zane a@t abderaware.com
Hi Joe,
Thanks for your response.
1) the Connect() call does not return immediately but inexplicably seems to
take several seconds
I did some test, it will prompt the exception immediately after issuing the
Connect() call on my side. In addition, I stil recommend you use the
asynchronous socket calls.
I look forward to your feedback.
Have a nice day!
Regards,
HuangTM
This posting is provided "AS IS" with no warranties, and confers no rights. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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