From: Paul Brannan <pbrannan@...>
Date: 2004-03-13T05:17:19+09:00
Subject: Re: How to write a blocking ruby function in c ?

On Fri, Mar 12, 2004 at 03:44:34PM +0900, Lothar Scholz wrote:
>   So i think i should write the following function:
> 
>   VALUE read_data (VALUE self, VALUE from)
>   {
>      if ( ...from has no data....) rb_thread_stop();
>      data = .... read data from subsystem
>      return data;
>   }
> 
>   but how can i do the thread wakeup call ?

I think what you want is something like this:

  1. See if you have data waiting; if you do read and return.
  2. If there is no data waiting, then call rb_thread_select with your
     file descriptor to wait on data.
  3. When rb_thread_select returns, read and return the data.  If not
     enough data is available, call rb_thread_select again and repeat.

Paul