From: Zack Weinberg <zackw@panix.com>
To: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Cc: libc-alpha <libc-alpha@sourceware.org>
Subject: Re: [RFC PATCH] Deprecate _REENTRANT and _THREAD_SAFE.
Date: Sat, 10 Dec 2016 13:56:00 -0000 [thread overview]
Message-ID: <CAKCAbMg6A=Y0viePELOmfCX-eS95AhOU4FUHy1B=u4_AUYaPhg@mail.gmail.com> (raw)
In-Reply-To: <cf5ed055-0f69-175d-690a-877ecdc44bc4@gmail.com>
On Sat, Dec 10, 2016 at 7:00 AM, Michael Kerrisk (man-pages)
<mtk.manpages@gmail.com> wrote:
> By now, the text reads:
>
> _REENTRANT
> Historically, on various C libraries it was necessary to
> define this macro in all multithreaded code. (Some C
> libraries may still require this.) In glibc, this macro
> also exposed definitions of certain reentrant functions.
>
> However, glibc has been thread-safe by default for many
> years; since glibc 2.3, the only effect of defining _REEN‐
> TRANT has been to enable one or two of the same declara‐
> tions that are also enabled by defining _POSIX_C_SOURCE
> with a value of 199606L or greater.
>
> _REENTRANT is now obsolete. In glibc 2.25 and later,
> defining _REENTRANT is equivalent to defining
> _POSIX_C_SOURCE with the value 199606L. If a higher POSIX
> conformance level is selected by any other means (such as
> _POSIX_C_SOURCE itself, _XOPEN_SOURCE, _DEFAULT_SOURCE, or
> _GNU_SOURCE), then defining _REENTRANT has no effect.
>
> This macro is automatically defined if one compiles with
> cc -pthread.
>
> Seem okay?
Looks good to me.
zw
next prev parent reply other threads:[~2016-12-10 13:56 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-06 15:22 Zack Weinberg
2016-12-06 15:36 ` Florian Weimer
2016-12-06 16:43 ` Zack Weinberg
2016-12-07 9:06 ` Florian Weimer
2016-12-07 13:52 ` Zack Weinberg
2016-12-08 19:51 ` Carlos O'Donell
2016-12-08 20:41 ` Zack Weinberg
2016-12-06 16:46 ` Joseph Myers
2016-12-06 16:48 ` Zack Weinberg
2016-12-08 18:21 ` Mike Frysinger
2016-12-08 9:01 ` Michael Kerrisk
2016-12-08 14:01 ` Zack Weinberg
2016-12-09 10:33 ` Michael Kerrisk (man-pages)
2016-12-09 18:07 ` Zack Weinberg
2016-12-10 12:01 ` Michael Kerrisk (man-pages)
2016-12-10 13:56 ` Zack Weinberg [this message]
2016-12-10 14:23 ` Michael Kerrisk (man-pages)
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