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One Task to Rule Them All (TCP accept)
Posted: Tue Sep 29, 2020 11:29 pm
by zealott
Ok, so with serial ports I can have one select that works on all ports by using FD_SET.
This obviously work the same for all filedescriptors, however is it possible to combine the listen/accept in the same instead of having those in a separate task? (let say I want to have 10 TCP server ports available, I'd hate to use 10 tasks for that).
Any hints?
Re: One Task to Rule Them All (TCP accept)
Posted: Wed Sep 30, 2020 5:34 am
by sulliwk06
The listen call returns a socket, so you should be able to add that socket into your fd set for the select call, and then accept new connections inside there.
Re: One Task to Rule Them All (TCP accept)
Posted: Wed Sep 30, 2020 7:25 am
by pbreed
Not sure if your in 3.X or 2.9.X land...
In 2.9.X:
nburn\examples\StandardStack\TCP\TcpMultiSocket
In 3.X
\nburn\examples\TCP\TcpMultiSocketServer
Both basically the same example.
Look for the comments with the word listen .....
Re: One Task to Rule Them All (TCP accept)
Posted: Wed Sep 30, 2020 10:31 am
by zealott
Thanks, for some weird reason I thought listen() would block and not go further until a connection has been made...
Re: One Task to Rule Them All (TCP accept)
Posted: Wed Sep 30, 2020 4:41 pm
by pbreed
Yeah listen just opens the port for listening,
accept is the one that actuall blocks if ther eis no pending connection..
And select wakes up when you wait for data on a listening socket...
Its possible to wake up for a connection and have accept fail, if the other side has closed the socket before you accepted it..