[ ruby-Bugs-2186 ] thread scheduling problem with io on files in /proc on 1.8.2

Bugs item #2186, was opened at 2005-07-29 14:23
You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=2186&group_id=426

Category: None
Group: None
Status: Open
Resolution: None
Priority: 3
Submitted By: Paul Brannan (cout)
Assigned to: Nobody (None)
Summary: thread scheduling problem with io on files in /proc on 1.8.2

Initial Comment:
On SuSE 9.1 (kernel 2.6.5), the following program outputs:
-- 1 --

and then hangs.  It should instead output:
-- 1 --
-- 2 --
test.rb:15:in `wakeup': killed thread (ThreadError)

The weird part is that it only seems to happen with files in the /proc filesystem.

Here's the code:

t = Thread.new do
  Thread.current.abort_on_exception = true
  # File.open('/etc/passwd') do |file| # <-- works fine
  File.open('/proc/loadavg') do |file| # <-- hangs in gets
    puts "-- 1 --"
    line = file.gets

    puts "-- 2 --"
  end
end

# uncomment the following line and the program runs fine
# loop { t.wakeup }

Thread.stop


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You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=2186&group_id=426