From: JB <temuphaey0@...>
Date: 2003-12-15T23:22:15+09:00
Subject: Re: threads and io

Extract of Ruby manual:

Threads and Processes
"And if some thread happens to make a call to the operating system that
takes a long time to complete, all threads will hang until the interpreter
gets control back. "

This is what hapens when I call $stdin.gets


Here is a simplier program to show the problem

require 'thread'
mutex = Mutex.new

$i = 0
thread1 = Thread.new() {
        while(1)
            mutex.synchronize do
              $i = $i + 1
            end
        end
  }

loop = true
print "Q to quit\n"
while(loop)
   c= $stdin.gets
   loop = false if (c=~ /Q.*/)

   mutex.synchronize do
      print "i=",$i,"\n"
      $i = 0
   end
end