From: Tomasz Wrobel <tomekwr@...>
Date: 2009-04-30T18:42:14+09:00
Subject: reading from fifo with no writers blocks the whole process

Hi,

in my program I'm creating a thread, in which I open a FIFO and read
data from it.

pipe_listener_thread = Thread.new(ARGV[0]) do |fifoname|
  while true   # loop to reopen fifo, when it ends because of no writers
    fi = File.open(fifoname, "r")
    while line = fi.gets
      puts "msg: #{line}"
    end
    fi.close
  end
end

Everything works fine, except that when the thread is waiting to open
the fifo, whole process - all threads seem to be blocked. Such thing
doesn't happen when waiting for data (inner loop) - where the thread
alone gets blocked.

Please tell, if there's something wrong with this behavior, or it should
work that way.

Regs,
Tomasz Wrobel
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