[PATCH] towlower.3: ATTRIBUTES: Note function that is thread safe with exceptions

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The function towlower() is thread safe with exceptions.

Signed-off-by: Peng Haitao <penght@xxxxxxxxxxxxxx>
---
 man3/towlower.3 | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/man3/towlower.3 b/man3/towlower.3
index 1c2e097..69acb49 100644
--- a/man3/towlower.3
+++ b/man3/towlower.3
@@ -13,7 +13,7 @@
 .\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
 .\"   ISO/IEC 9899:1999
 .\"
-.TH TOWLOWER 3  1999-07-25 "GNU" "Linux Programmer's Manual"
+.TH TOWLOWER 3  2014-01-06 "GNU" "Linux Programmer's Manual"
 .SH NAME
 towlower \- convert a wide character to lowercase
 .SH SYNOPSIS
@@ -50,6 +50,14 @@ if
 .I wc
 is
 .BR WEOF .
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR towlower ()
+function is thread-safe with exceptions.
+It can be safely used in multithreaded applications, as long as
+.BR setlocale (3)
+is not called to change the locale.
 .SH CONFORMING TO
 C99.
 .SH NOTES
-- 
1.8.4.2

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