[M3devel] how to switch between user and kernel threads..

[Tony Hosking]

I don't want dynamic switching.  A link-time switch is just fine.

Also, please don't go messing about with this right now -- I have  
changes pending for the threads system that will be harder to  
integrate if you change with it further.

On 14 Jan 2009, at 20:14, Jay wrote:

> Are people really against using function pointers for this?
> Either changing the interface to have function pointer variables  
> (I'm not sure Modula-3 allows this, but in C you can fairly  
> transparently replace functions with function pointers; client code  
> just keeps working; it breaks down in C++ with overloading), or  
> having a set of functions that just call/jump through function  
> pointers? There would be no if, no conditional branches.
>
> Dynamic linking on Windows always goes through function pointers  
> already.
>  So while yes it adds another instruction, it is already never  
> getting inlined.
> Don't other platforms do that too?
> Or they patch every call site?
>
> I'm not sure otherwise of a simple method.
> Easiest might be to have a parallel directory structure to m3core,  
> with just m3core files.
> That would wastefully rebuild all of m3core a second time, for just  
> a small amount of variation.
>
> I think function pointers are the way to go here.
>
>  - Jay
>
>
>
>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://m3lists.elegosoft.com/pipermail/m3devel/attachments/20090114/480c7a0c/attachment-0002.html>