Re: [PATCH] fmtmsg.3: ATTRIBUTES: Note function that is thread-safe
From: Michael Kerrisk <hidden>
Date: 2013-05-18 18:15:58
Possibly related (same subject, not in this thread)
- 2013-04-25 · [PATCH] fmtmsg.3: ATTRIBUTES: Note function that is thread-safe · Peng Haitao <hidden>
On 04/25/13 05:49, Peng Haitao wrote:
Before glibc 2.16, fmtmsg() is not thread-safe. Since glibc 2.16, it is thread-safe, the patch can refer to URL: http://sourceware.org/git/?p=glibc.git;a=commit;h=7724defcf8873116fe4efab256596861eef21a94
Applied to my local branch for this work. Thank you, Peng. Cheers, Michael
quoted hunk
Signed-off-by: Peng Haitao <redacted> --- man3/fmtmsg.3 | 10 ++++++++++ 1 file changed, 10 insertions(+)diff --git a/man3/fmtmsg.3 b/man3/fmtmsg.3 index f4b3d6f..3e3d3f9 100644 --- a/man3/fmtmsg.3 +++ b/man3/fmtmsg.3@@ -222,6 +222,16 @@ is the string printed when a message of this class is processed by .SH VERSIONS .BR fmtmsg () is provided in glibc since version 2.1. +.SH ATTRIBUTES +.SS Multithreading (see pthreads(7)) +Before glibc 2.16, the +.BR fmtmsg () +uses a static variable that is not protected, so it is not thread-safe. + +Since glibc 2.16, the +.BR fmtmsg () +uses a lock to protect static variable, so it is thread-safe. +.\" Modified in commit 7724defcf8873116fe4efab256596861eef21a94 .SH CONFORMING TO The functions .BR fmtmsg ()
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