SharedUnixLibrary and the System Heap

Matt Edgar matt at
Mon Mar 27 16:11:59 PST 2006

Alex Waugh wrote:

> I'm glad to see such improvements are being considered.
>>Unfortunately SUL does this, so protecting the heap would break a lot of 
> Do you mean memory allocated by OS_Module 6, executing module code
> from user mode, the module private word, or something else? Those are
> the only things I can think of that may be accessed from user mode in
> the SUL.

I have not spent much time tracking this down, but probably all of the 
above are issues.

The example I gave of |delink| seems to cover at least executing module 
code and writing to the module private word in user mode (the later as a 
consequence of the former).


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