Hello,
certainly not.

First of all _Thread_local is a C11 feature, out of reach for a
portable library implementation still for some years.

Then the requirement that this is a static state per function is a
fixed requirement in the standard. No way out of that.

Jens

Am Freitag, den 08.05.2015, 15:36 +0800 schrieb 罗勇刚(Yonggang Luo) :
> 218933012b1f0f052f91ac39ee5cc6daba99237d
>  src/multibyte/mbrtowc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/src/multibyte/mbrtowc.c b/src/multibyte/mbrtowc.c
> index e7b3654..de8d5ae 100644
> --- a/src/multibyte/mbrtowc.c
> +++ b/src/multibyte/mbrtowc.c
> @@ -8,15 +8,15 @@
>  #include <errno.h>
>  #include "internal.h"
> 
> +_Thread_local static mbstate_t internal_state;
>  size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t
> n, mbstate_t *restrict st)
>  {
> - static unsigned internal_state;
>   unsigned c;
>   const unsigned char *s = (const void *)src;
>   const unsigned N = n;
>   wchar_t dummy;
> 
> - if (!st) st = (void *)&internal_state;
> + if (!st) st = &internal_state;
>   c = *(unsigned *)st;
> 
>   if (!s) {
> 


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