pass

/*
 *  call-seq:
 *     Thread.pass   => nil
 *  
 *  Invokes the thread scheduler to pass execution to another thread.
 *     
 *     a = Thread.new { print "a"; Thread.pass;
 *                      print "b"; Thread.pass;
 *                      print "c" }
 *     b = Thread.new { print "x"; Thread.pass;
 *                      print "y"; Thread.pass;
 *                      print "z" }
 *     a.join
 *     b.join
 *     
 *  <em>produces:</em>
 *     
 *     axbycz
 */

static VALUE
rb_thread_pass()
{
    rb_thread_schedule();
    return Qnil;
}