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Re: PATCH: Merge objc-improvements-branch to mainline

From: Ziemowit Laski
Subject: Re: PATCH: Merge objc-improvements-branch to mainline
Date: Wed, 24 Sep 2003 17:40:17 -0700

On Wednesday, Sep 24, 2003, at 16:42 US/Pacific, Pete French wrote:

It's '@synchronized' (sorry, couldn't resist :-) ), and it currently

Ah well, another one to add to the list of "things to edit before typing
make the second time" along witn NSColour -> NSColor then :-)

only works
with the NeXT runtime (i.e., on Darwin systems).

...because you can guarantee what threads library you will be linking against preseumably ? On systems with more than one threads library then I guess
aany implementation in libobjc is going to have to specify what threads
library it neeeds linking against to work I guess (or at least say that it
links to a library providing a certain call for thread locking and
waiting primitves).

Actually that change looks quite nice, though having thread primitives
in a language which is completely unaware of threads in all other
ways seeems a bit odd.

How would make the langauge "aware" of threads?  I'm thinking of Java,
where you have 'synchronized' and a "thread library" in the form of
java.lang.Thread, but that seems to be it!  (Please correct me if I'm

Also, I think that the locking and waiting that the @synchronized construct requires can be easily implemented on top of just about any thread library, and I don't see why the semantics of said locking and waiting would/could
suffer as a result.  What kind of problems do you foresee?

Also, I suppose that if/when you guys choose to add exception support to
the GNU runtime, you can standardize on, say, pthreads and be done with it...

You wernt tempted to add in a few extra bits of
syntax to support parallelism in the language itself at all were you ?

Nope. :-)

Ziemowit Laski                 1 Infinite Loop, MS 301-2K
Mac OS X Compiler Group        Cupertino, CA USA  95014-2083
Apple Computer, Inc.           +1.408.974.6229  Fax .5477

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