aio vs non-blocking-io
mdounin at mdounin.ru
Mon Dec 12 10:09:17 UTC 2011
On Sun, Dec 11, 2011 at 06:58:57PM -0500, double wrote:
> Is there a chance to use non-blocking-io with nginx?
> AIO is quite broken on Linux, but "O_NONBLOCK" is not.
Does O_NONBLOCK works on Linux for regular files? If yes, where
is sematics defined?
POSIX says behaviour of O_NONBLOCK on regular files is
unspecified, and it's indeed impossible to use O_NONBLOCK on
regular files with POSIX interfaces: there is no way to schedule
read operation and there is no way to find out if I/O possible
(select()/poll() always return regular files as ready for
reading/writing as per POSIX).
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