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Date: Tue, 4 Aug 2009 21:59:21 +0100
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Subject: _setlocale_r
From: Andy Koppe <andy DOT koppe AT gmail DOT com>
To: Cygwin Tech List <cygwin AT cygwin DOT com>
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_setlocale_r isn't really reentrant, is it? It invokes loadlocale(),
which writes to the global function pointers __mbtowc and __wctomb,
i.e. there's a single global locale setting.

Its man page needs to be corrected:

       `_localeconv_r'  and  `_setlocale_r'  are  reentrant   versions   of
       `localeconv' and `setlocale' respectively.  The extra argument REENT is
       a pointer to a reentrancy structure.

(Alternatively, making them reentrant by making the locale settings
part of the REENT structure might be rather useful actually, for at
least two reasons: different threads could use different locales, and
you could convert between different charsets using the the _r versions
of the mb functions without having to switch locale all the time.)

Andy

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