From: Joel VanderWerf <vjoel@...>
Date: 2006-03-01T13:29:45+09:00
Subject: Re: Waking ruby thread on external event

Bill Kelly wrote:
> Hi,
> 
> I have Ruby embedded into a multithreaded C++ app.  It's easy for
> a C++ thread to wait for an event from a Ruby thread.(*)  But I'm
> looking for ways to allow a Ruby thread to sleep until an event
> from a C++ thread is posted.
> 
> My application is cross-platform so my solution needs to work on
> Windows and OS X.
> 
> So far all I can think of, without hacking ruby itself, is to
> open a TCP or UDP socket, and have the Ruby thread select() on
> the socket.  Then the C++ side can fire a packet at the socket to
> wake the ruby thread up.
> 
> Can anyone think of a simpler way?  I haven't measured the overhead
> yet, but offhand it seems overkill to send a packet through the IP
> stack to do the work of a condition variable.  (But yes I do need
> to actually measure it.)

Can the ruby thread just Thread.sleep, and wait for the C++ code to call
rb_thread_wakeup() or whatever it is that implements Thread#wakeup ?

-- 
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407