From: Francis Cianfrocca <garbagecat10@...>
Date: 2006-05-21T08:40:46+09:00
Subject: sysread changes behavior in the presence of threads?

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What am I missing here?

require 'socket'
require 'fcntl'
Thread.new {sleep 100}
sd =3D TCPsocket.new( "www.cisco.com", 80)
m =3D sd.fcntl( Fcntl::F_GETFL, 0)
sd.fcntl( Fcntl::F_SETFL, Fcntl::O_NONBLOCK | m)
sd.sysread(4096)

This code blocks in the sysread, in effect ignoring the nonblocking mode se=
t
on the file descriptor. But if you comment out the line that spins the
thread, the sysread raises Errno::EAGAIN as you'd expect.

Is this a defined behavior or a bug?

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