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List:       linux-man
Subject:    Re: [PATCH] mallinfo.3: ATTRIBUTES: Note function that is not thread-safe
From:       "Michael Kerrisk (man-pages)" <mtk.manpages () gmail ! com>
Date:       2015-09-11 10:06:53
Message-ID: 55F2A7BD.3070308 () gmail ! com
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On 08/24/2015 12:19 PM, Zeng Linggang wrote:
> The marking matches glibc marking.
> The marking of functions in glibc is:
> - mallinfo: MT-Unsafe init const:mallopt

Applied!  Thanks, Zeng Linggang.

Cheers,

Michael

> Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
> ---
>  man3/mallinfo.3 | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/man3/mallinfo.3 b/man3/mallinfo.3
> index 7797169..e6661d1 100644
> --- a/man3/mallinfo.3
> +++ b/man3/mallinfo.3
> @@ -107,6 +107,31 @@ This is the maximum number of bytes that could ideally
>  .BR malloc_trim (3).
>  .\" .SH VERSIONS
>  .\" Available already in glibc 2.0, possibly earlier
> +.SH ATTRIBUTES
> +For an explanation of the terms used in this section, see
> +.BR attributes (7).
> +.TS
> +allbox;
> +lb lb lbw28
> +l l l.
> +Interface	Attribute	Value
> +T{
> +.BR mallinfo ()
> +T}	Thread safety	MT-Unsafe init const:mallopt
> +.TE
> +
> +.BR mallinfo ()
> +would access some global iternal objects. If modify them with non-atomically,
> +may get inconsistent results.
> +The identifier
> +.I mallopt
> +in
> +.I const:mallopt
> +mean that
> +.BR mallopt ()
> +would modify the global iternal objects with atomics, that make sure
> +.BR mallinfo ()
> +is safe enough, others modify with non-atomically maybe not.
>  .SH CONFORMING TO
>  This function is not specified by POSIX or the C standards.
>  A similar function exists on many System V derivatives,
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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