On Wed, 11 Feb 2009 18:44:53 -0800 (PST), birdsong <david.birds...@gmail.com>
wrote:
I'm pretty sure I've exhausted all searches and read all the forums
Google will turn up related to this issue.
I touch an empty file in a sh shell, fire up the python shell, open
the file for reading(tried all buffering options), register it with a
poll object for select.POLLIN and call poll(), but the poll never
blocks and always returns for the FD, EVENT combination I ask for, but
the file has not anything written to it.
Filesystem files are always reported as readable and writeable by select,
poll, epoll, etc.
If you want to do non-blocking filesystem I/O, your choices are to use a
native thread (Python's threading module, or another third-party module
which wraps the platform thread API) or to use POSIX AIO (or the mildly
incompatible Linux variant. Of course, AIO has tons of caveats and is
generally in a miserable state, so you probably shouldn't use it. That
leaves you with threads.
Jean-Paul
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