[fpc-devel] OO rewrite - technical questions
DrDiettrich1 at aol.com
Sat Jul 24 17:12:35 CEST 2010
Nikolai Zhubr schrieb:
>> IMO the segment register is used implicitly in thread API calls, with
>> no further use by application code.
> Exactly the opposite (at least delphi on windows). See delphi's RTL.
Well, once it's set by the OS, it can be used in hackery ;-)
> In such case of course fs/gs will not map to the same flat address
> segment (as cs, ds, es, ss) common for the whole process and all of its
I doubt that this address range really is excluded from the 4GB app
address space, accessible through the other segment registers.
>> Consider a threadvar as a field of a related thread object (instance).
> This might be fine most of the time (for end user in particular),
> however there still might be some non-OO code which it is
> impossible/impractical to convert into object-oriented model. See FPC RTL.
Where exactly should I look?
In the meantime I found one possible use for threadvars: when some
subroutine can be called from different threads, it may want to retrieve
the thread context, e.g. the thread object itself. Right?
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