Re: Continuations?

• To: info-dylan@ai.mit.edu
• Subject: Re: Continuations?
• From: Rob Myers <robm@h2g2.com>
• Date: Fri, 10 Nov 2000 17:59:20 +0000
• Sender: owner-info-dylan@ai.mit.edu

The GUSI Pthreads library for Classic MacOS (used in MacPerl) switches threads when you call socket routines as well as yield(). This works quite well apparently.
MacOS X has PThreads, but I think Carbon still isn't threadsafe, so you can only call graphics routines from one thread. This is a common restriction even in languages like Java, where Swing is explicitly not threadsafe.
Patrick Beard's original Mindy Toolbox library had thread-safety routines for QuickDraw, as Mindy has multiple threading support (in its VM).
Bear in mind that WaitNextEvent() is effectively a global or application-level yield(), you don't have to wait very long if you don't want to.

- Rob.

On Friday, November 10, 2000, at 09:45 AM, Bruce Hoult wrote:

> I'm talking about calling yield()  
> in a user-mode threads library, which switches you to a different thread  
> *within* your application. 

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