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simple-init Bug Fix For Aug 2016

Journal by cafebabe

A problematic bug in simple-init can be resolved by eliminating one variable. Specifically, change:-

$wait=60*60*24;
while($active&& $running) {
  (undef,$wait)=select(undef,undef,undef,$wait);
}

to:-

while($active&& $running) {
  select(undef,undef,undef,60*60*24);
}

or suchlike. This change eliminates the case where the variable is zero and a busy wait on select() ensues.

Minor bugs remain. Regardless, simple-init is now suitable for deployment on systems which do not require suspend.

 

Reply to: Wha?

    (Score: 2) by Knowledge Troll on Thursday August 18 2016, @04:48PM

    by Knowledge Troll (5948) on Thursday August 18 2016, @04:48PM (#389645) Homepage

    Is this perl 5? Are you using select() as a higher resolution sleep than sleep()? Is this expected to be portable? If so I think you have a problem on your hands as select() does not always act well behaved.

    Time::HiRes with the higher precision sleep is what I would do if this was perl 5 - as well as checking the time before and after calling what ever sleep() variant I used to make sure the correct amount of time has passed or return to sleeping if not.

    This code looks optimistic and optimistic system code is dangerous.

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