If you're talking about the standard socket module, I'm not aware that it uses IOCP on Windows. Are you asking this just in the abstract, or do you know of a Python implementation that uses IOCP to implement the standard socket type?
As to the design of the async I/O library (which I am still working on!), I cannot guarantee anything, and the issue will probably be moot -- the API won't have the same kind of timeout as the current socket object (it will have other ways to set deadlines though). Confusedly yours, --Guido On Mon, Nov 26, 2012 at 3:49 AM, Kristján Valur Jónsson <krist...@ccpgames.com> wrote: > Regarding the recent discussion on python-ideas about asyncronous IO, I‘d > like to ask a question about python socket‘s Timeout feature. > > Specifically this: Is it a documented or a guaranteed feature that a > send/receive operation that times out with a socket.timeout error is > re-startable on that socket? > > > > The reason I ask is that depending on the implementation, a timeout may > leave a socket in an undefined state. > > As it is implemented in the standard cPython implementation, the timeout > feature is done with an internal select() call. Thus, if the select() call > times out, socket send/receive is not even called, so a retry is possible > without issue. > > However, other implementations of python sockets, e.g. ones that rely on IO > completion, may not have the luxury of using select. For example, on > Windows, there is no way to abort an IOCP socket call, so a timeout must be > implemented by aborting the wait. Dealing with the resulting race can be an > interesting challenge. > > > > K > > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > http://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > http://mail.python.org/mailman/options/python-dev/guido%40python.org > -- --Guido van Rossum (python.org/~guido) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
