[PATCH] modf.3: ATTRIBUTES: Note functions that are thread-safe

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The functions modf(), modff() and modfl() are thread safe.

Signed-off-by: Peng Haitao <penght@xxxxxxxxxxxxxx>
---
 man3/modf.3 | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/man3/modf.3 b/man3/modf.3
index 7b30002..1532ac6 100644
--- a/man3/modf.3
+++ b/man3/modf.3
@@ -87,6 +87,14 @@ is positive infinity (negative infinity), +0 (\-0) is returned, and
 is set to positive infinity (negative infinity).
 .SH ERRORS
 No errors occur.
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR modf (),
+.BR modff (),
+and
+.BR modfl ()
+functions are thread-safe.
 .SH CONFORMING TO
 C99, POSIX.1-2001.
 The variant returning
-- 
1.8.1.4

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