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

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After research, We think pthread_attr_setaffinity_np() and
pthread_attr_getaffinity_np() are thread-safe. But, there are not
markings of them in glibc document.

Signed-off-by: Zeng Linggang <zenglg.jy@xxxxxxxxxxxxxx>
---
 man3/pthread_attr_setaffinity_np.3 | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/man3/pthread_attr_setaffinity_np.3 b/man3/pthread_attr_setaffinity_np.3
index ce49abb..cc6e94b 100644
--- a/man3/pthread_attr_setaffinity_np.3
+++ b/man3/pthread_attr_setaffinity_np.3
@@ -105,6 +105,20 @@ is too small).
 Could not allocate memory.
 .SH VERSIONS
 These functions are provided by glibc since version 2.3.4.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbw30 lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.BR pthread_attr_setaffinity_np (),
+.BR pthread_attr_getaffinity_np ()
+T}	Thread safety	MT-Safe
+.TE
+
 .SH CONFORMING TO
 These functions are nonstandard GNU extensions;
 hence the suffix "_np" (nonportable) in the names.
-- 
1.9.3

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