[PATCH] siginterrupt.3: ATTRIBUTES: Note function that is not thread-safe

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The function siginterrupt() is not thread safe.

Signed-off-by: Peng Haitao <penght@xxxxxxxxxxxxxx>
---
 man3/siginterrupt.3 | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/man3/siginterrupt.3 b/man3/siginterrupt.3
index bdf8b21..8365348 100644
--- a/man3/siginterrupt.3
+++ b/man3/siginterrupt.3
@@ -84,6 +84,12 @@ set to indicate the cause of the error.
 .TP
 .B EINVAL
 The specified signal number is invalid.
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR siginterrupt ()
+function uses a global variable that is not protected,
+so it is not thread-safe.
 .SH CONFORMING TO
 4.3BSD, POSIX.1-2001.
 POSIX.1-2008 marks
-- 
1.9.3

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