From: Tanaka Akira <akr@...>
Date: 2009-09-11T00:16:23+09:00
Subject: Re: Timer implementation

In article <4aa8deb2$0$25181$d40e179e@nntp02.dk.telia.net>,
  Robert Larsen <robert@komogvind.dk> writes:

> BUT...the 'start' method does not work since 'ConditionVariable' does not have a 'wait' method that takes a maximum wait time in milliseconds like we have in Java.

In ruby 1.9, timeout argument can be implemented as follows.

Index: lib/thread.rb
===================================================================
--- lib/thread.rb	(revision 24783)
+++ lib/thread.rb	(working copy)
@@ -59,13 +59,16 @@
   #
   # Releases the lock held in +mutex+ and waits; reacquires the lock on wakeup.
   #
-  def wait(mutex)
+  # If +timeout+ is given, this method returns after +timeout+ seconds passed,
+  # even if no other thread doesn't signal.
+  #
+  def wait(mutex, timeout=nil)
     begin
       # TODO: mutex should not be used
       @waiters_mutex.synchronize do
         @waiters.push(Thread.current)
       end
-      mutex.sleep
+      mutex.sleep timeout
     end
   end
 
-- 
Tanaka Akira