From: Michal Rokos <m.rokos@...>
Date: 2002-08-22T19:06:15+09:00
Subject: Re: [Cleanup?] Int vs Long

Hi,

On Wed, Aug 21, 2002 at 02:00:17PM -0400, James F. Hranicky wrote:
> 
> How's ThreadSafeRuby coming along?
> 

	My idea was to bring real threads to Ruby (POSIX, Windows, or SW
	emul (as it is now)).

	For native threads, you definitely need some locking.

	The problem is what to lock.
	====================================
	My idea was to add RW-Lock into every ruby object (to RBasic
	struct).
	
	So: Every binding method should call rb_lock_wr, or
	rb_lock_rd. I think that we cannot use POSIX rwlock, because we
	need reentrant write lock for the same thread (or rewrite
	methods not to call each other that could be definitely a big
	pain) - so we have to write our own RWlock)

	As I calculated the space needed for this new lock, it could add
	about 5 pointers size to every Ruby object, that means: doubles
	memory needs! (Current std. Ruby object is about 5 pointers as
	well) I'm not sure wether it is acceptable.

	Also this could bring a lot of deadlocks and I'm not sure if it
	is suitable for eval and parsing part.
	====================================

	If you will have just 1 global lock, I don't see any benefit of
	bringing native threads in.
	
	So the project has stopped because of lack of discussion.

		Michal

-- 
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Michal Rokos                         Czech Technical University, Prague
E-mail:m.rokos@sh.cvut.cz      ICQ:36118339      Jabber:majkl@jabber.cz
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