Why are there locale troubles under Windows?

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I will report a snippet from http://php.net/setlocale

> Warning
>
> The locale information is maintained per process, not per thread. If
> you are running PHP on a multithreaded server api like IIS or Apache
> on Windows you may experience sudden changes of locale settings while
> a script is running although the script itself never called setlocale
> itself. This happens due to other scripts running in different threads
> of the same process at the same time changing the processwide locale
> using setlocale().
>

I spent about 2 seconds before thinking: can it really be? I mean, is
there no way to set locale info per thread? And after a brief web
search I came up with this keyword: _configthreadlocale

Read more at
http://msdn2.microsoft.com/en-us/library//26c0tb7x(VS.80).as px
(beware, this page is very slow or their servers are anyway).
Looks like this function exists since Windows 95 and guess what it
does: it affects the behaviour of the locale functions so that _each
thread will have indipendent locale settings_.

So, I though: WHY? Why does not PHP use such function in the win32
binding?

Let's be clear, I don't think to have found a solution that (the great)
PHP developers could not find, but I would like to know why they did
not fix the bad behaviour of PHP's setlocale() function using the
_configthreadlocale() win32 function, there must be some reason I
really could not think about up to now.

I really hope somebody can point me to something to read about this
topic (I found pretty nothing up to now) or better directly explain it
to me.

Thank you
--
Daniele C.

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