From: Difei Zhao <difeiz@...>
Date: 2008-09-05T14:27:05+09:00
Subject: about critical section

Greetings all,

  I post a similar message to rails mailing list since I encountered
this problem during development of a rails application, but now the
problem is more ruby specific, so I decided to post here.

  Basically, I have to implement a critical section like this to avoid
race condition:

/* begin critical section */
loop do
filename = generate_filename
break unless File.exist?(filename)
end
File.new(filename).flock
/* end */
write_to_filename

  Somebody said I could open a file with exclusive lock, but I do not
know an atomic way. Could anyone help? Thanks alot!

Difei
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