Re: hard-locale: make multithread-safe

[Tim Rühsen]

Hi Bruno, hi gnulib developers,

it's a joy to follow the posts on this list - you (all) surprise,
impress and inspire me with your code but even more with your detailed
explanations / documentations.

Thank you so much for your ongoing work !!!

[E.g. this post made me check my code for mbtowc/mbrtowc (and also to
read the man pages again). In fact I found a call to mbtowc in MT code
(protected by a mutex) without resetting the internal state.]

Regards, Tim

On 12/17/19 2:45 PM, Bruno Haible wrote:
> Hi Paul,
> 
> Here is a proposed patch to make the hard_locale() function multithread-safe.
> This is needed because our mbrtowc() override relies on hard_locale, and
> mbrtowc obviously must be multi-thread safe (that's one of its main features,
> compared to mbtowc).
> 
> The previous hard_locale code tries to guess whether a locale is in fact
> a "C"/"POSIX" locale, although it is not apparent from its name. This was
> a case to worry about between 1995 and 2000, when many systems did not
> have working locales. This has changed: Nowadays nearly all platforms
> honour the locale names with some localized behaviour, except OpenBSD,
> Minix, and Android. It's not my priority to optimize for these three
> systems. But if you want to keep optimizations for these platforms,
> we could add #ifs for these platforms.

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