From: Yukihiro Matsumoto <matz@...>
Date: 2010-12-16T07:46:34+09:00
Subject: [ruby-core:33740] Re: [Ruby 1.9-Feature#2294] [PATCH] ruby_bind_stack() to embed Ruby in coroutine

Hi,

In message "Re: [ruby-core:33730] Re: [Ruby 1.9-Feature#2294] [PATCH] ruby_bind_stack() to embed Ruby in coroutine"
    on Thu, 16 Dec 2010 02:48:07 +0900, SASADA Koichi <ko1@atdot.net> writes:
|
|Hi,
|
|Suraj, I'm sorry for late response.  I missed this thread.
|
|I read the last patch:
|http://redmine.ruby-lang.org/attachments/download/1153
|
|and I need to say "no".
|
|As nobu said at first, this patch is not considering the multi-threading.
|(and using global variables should not be accepted :)  The patch is too
|ad-hoc modification)
|
|
|I propose another API.
|
|idea 1:
|
|// API for C extension.
|// User needs to know thread value.
|rb_thread_set_stack(VALUE thread_val, upper, lower) {
|  th = thread_data(thread_val);
|  th->upper = upper;
|  th->lower = lower;
|}
|
|idea 2:
|
|// API called from not a Ruby world
|ruby_bind_stack_for_current_native_thread(upper, lower) {
|  th = thread_data_for_current_native_thread();
|
|  if (th == 0) {
|    // Current native thread does not have
|    // the related ruby thread.
|    return 0;
|  }
|
|  th->upper = upper;
|  th->lower = lower;
|  return 1;
|}
|
|
|BTW, how to get the correct "upper"/"lower" address of stack?

I am afraid that there's no portable and/or reliable way.
Conservative GC does similar thing, maybe you can steal boundary
values from it.

							matz.