From: Suraj Kurapati <redmine@...>
Date: 2009-09-21T02:42:14+09:00
Subject: [ruby-core:25674] [Feature #2126] ruby_init_stack() - add ability to specify or query max_stack_size

Issue #2126 has been updated by Suraj Kurapati.


Sigh, yet another mistake.  Below is my corrected request.  Sorry for
the trouble.

  Add a max_stack_size parameter to ruby_init_stack():

     void ruby_init_stack(VALUE* stack_start, size_t max_stack_size);

  Add a function to return Ruby's preferred stack size:

     size_t ruby_stack_size_preference();

  Add a function to return Ruby's preferred stack direction:

     bool ruby_stack_descends_p(); /* stack grows from high to low? */

  This way, I can provide a custom stack to Ruby:

     size_t stack_size = ruby_stack_size_preference();
     bool stack_descends = ruby_stack_descends_p();

     VALUE* stack_start = malloc(stack_size);

     if (stack_descends) {
       stack_start += stack_size;
     }

     ruby_init_stack(stack_start, stack_size);

If you wish to minimize the number of new functions added to the Ruby
C API, then perhaps you could add a RUBY_INIT_STACK_ON_HEAP macro
which makes Ruby do (internally) everything in the code shown above.

Thanks for your consideration.
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http://redmine.ruby-lang.org/issues/show/2126

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