[RFC PATCH glibc 12/12] C11 thrd: Downgrade the default alignment of mtx_t

[Samuel Thibault]

Sergey Bugaev, le dim. 12 févr. 2023 14:10:43 +0300, a ecrit:
> ..so that it can match the alignment of pthread_mutex_t on x86_64-gnu.

I'd say rather make pthread_mutex_t aligned on long int, so we can
possibly in the future put some pointers in it without breaking the ABI.

> This likely breaks many other arches (if not all of them), though.
> 
> Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
> ---
>  sysdeps/pthread/threads.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sysdeps/pthread/threads.h b/sysdeps/pthread/threads.h
> index 860d597d..207c1dee 100644
> --- a/sysdeps/pthread/threads.h
> +++ b/sysdeps/pthread/threads.h
> @@ -64,7 +64,7 @@ typedef __once_flag once_flag;
>  typedef union
>  {
>    char __size[__SIZEOF_PTHREAD_MUTEX_T];
> -  long int __align __LOCK_ALIGNMENT;
> +  int __align __LOCK_ALIGNMENT;
>  } mtx_t;
>  
>  typedef union
> -- 
> 2.39.1