[fpc-devel] Comparison FPC 2.6.2 - Delphi 7

[Michael Van Canneyt]

On Mon, 4 Mar 2013, Michael Schnell wrote:

> On 03/02/2013 04:02 PM, Florian Klaempfl wrote:
>> 
>> In theory yes but I still fear that the threadvars and synchronization eats 
>> much of the advantage in this case.
>> 
> I suppose the (high level) synchronization will be rather complex and eat 
> performance.
>
> The low level threadvar implementation is known to be improvable. AFAIR, it 
> uses library calls as well in Windows as in Linux while the appropriate C 
> compilers use segment registers (on x86 / x86-64) which are documented in 
> Linux and undocumented in Windows and supposedly a lot faster.

The "(on x86 / x86-64)" disqualifies your argument for use. 
The solution must work on ALL platforms...

BTW. threadvars in FPC are done in the same way as in Delphi, with TLS.

Michael.