python中TCP连接的网络资源[Windows]

Question

Not sure if I have myself a problem with a python script I'm using. Basically, it spawns threads, each creating a tcp connections. Well the script finishes, i even check if any threads are still functioning, all of them return False ( not active which is good).

The issue is that, if I check ( I use CurPorts from nirsoft ) some tcp connections ( between 1 and 9 sometimes ) are still in established status and sometimes in Sent status. Is that a problem ?They die out eventually, but after several minutes. IS that on python's side fault, or basic windows procedure?

I close the sockets with S.close, if that's of any help. I'm not using daemon threads, just simple threads, and I just wait until all of them finish (t.join())

I need to know i I should worry or just let them be. reason is that they are eating up the ephemeral port number, and besides that i do not know if its keeping resources from me.

Would appreciate a noob friendly response.

Last Edit: I do use S.shutdown() before I send S.close() I do not do any error checking though, I have no idea how to go about doing that besides try:

Answer 1

The simple answer is that TCP connections need to be gracefully shutdown before being closed.

There are more details on how to call shutdown and close there:

• How do you close TCP connections gracefully without exceptions?
• socket.shutdown vs socket.close
• http://msdn.microsoft.com/en-us/library/ms738547(VS.85).aspx