From: Robert Williams <rwilliams@...>
Date: 2007-11-06T23:25:12+09:00
Subject: threaded and forked select with timeout is impacted by syste

I am using ruby 1.8.6 on Fedora Core 6 and 7

I have encountered a problem with the timeout for a select statement
inside a thread or fork.

If the timeout is set for a duration of time and the system time is
moved back one hour the duration is increased 1
hour.  If the time is moved forward 1 hour the duration is shortened one
hour or fires instantly once the duration has
been exceeded.

I tested this functionality in c and timeout duration is not impacted by
a system time change.

For a simple test...

create a thread that loops 30 times
sleep for 1 second (select with 1 second timeout)
and put a string to the console

While the program is running set the system time back say 5 seconds
you will see a 5 second gap between prints.
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