From: Lothar Scholz <mailinglists@...>
Date: 2004-03-12T15:44:34+09:00
Subject: How to write a blocking ruby function in c ?

Hello,

  i must communicate with a c++ subsystem on windows.
  
  The subystem has a socket like interface and i want to write some
  kind of thread blocking: read/write calls.
  
  But of course i know that behind the scenes the thread can't block,
  because we have cooperative threading with setjmp/longjmp.

  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 ?

  The problem is that for performance reason i can't poll and i can't
  setup a timer to check frequently from the ruby operating system thread.
  I also can't use a signal, so is there any notification mechanism
  that works on windows ?

-- 
Best regards,
 Lothar                          mailto:mailinglists@scriptolutions.com