Dear all,
I'm working on a select implementation for jython (in combination with
non-blocking sockets), and a set of unit tests for same.
I decided to run all of the non-blocking unit tests, both server and
client side, in the same thread; seems to be a reasonable thing to do.
After all, avoiding threads is one of the great benefits of
non-blocking sockets.
Also, I'm writing the tests so that they'll hopefully pass on both
cpython and jython.
But I'm getting behaviour I don't expect on cpython, when a
non-blocking accept and connect_ex is used, for the server and client
sides respectively.
The following piece of code outputs what I expect on my jython
implementation, which is that both the server accept and client write
calls would NOT block.
But when I run the code on cpython, the code reports that both calls
would block, i.e. that neither side of the socket will progress with
the connection.
The code is
# -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
import socket
import select
SERVER_ADDRESS = ("", 54321)
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setblocking(0)
server_socket.bind(SERVER_ADDRESS)
server_socket.listen(5)
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.setblocking(0)
result = client_socket.connect_ex(SERVER_ADDRESS)
rfds, wfds, xfds = select.select([server_socket], [client_socket], [], 1)
if server_socket in rfds:
print "Server socket: accept would not block"
else:
print "Server socket: accept would block"
if client_socket in wfds:
print "Client socket: write would not block"
else:
print "Client socket: write would block"
server_socket.close()
client_socket.close()
# -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Is there some call that I am missing, e.g. something along the lines
of the java finishConnect() method on SocketChannel?
http://java.sun.com/j2se/1.4.2/docs/api/java/nio/channels/SocketChannel.html#finishConnect()
Is there any way to make the above code report, on cpython, that
neither side of the socket would block?
Am I missing some essential method call that would make either side
progress to a connected socket?
Thanks,
Alan.
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