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diff --git a/share/man/man3/pthread_mutexattr.3 b/share/man/man3/pthread_mutexattr.3
--- a/share/man/man3/pthread_mutexattr.3
+++ b/share/man/man3/pthread_mutexattr.3
@@ -132,6 +132,26 @@
.El
.Pp
The
+.Fn pthread_mutexattr_setpshared
+function will set the process-shared attribute of
+.Fa attr
+to the value specified in
+.Fa pshared .
+The argument
+.Fa pshared
+may have one of the following values:
+.Bl -tag -width ".Dv PTHREAD_PROCESS_PRIVATE"
+.It Dv PTHREAD_PROCESS_PRIVATE
+The mutex may only be used by threads in the same process as the one
+that created the object.
+.It Dv PTHREAD_PROCESS_SHARED
+The mutex may be used by
+threads in processes other than the one that created the object,
+assuming other processes have access to the memory where the mutex
+was allocated.
+.El
+.Pp
+The
.Fn pthread_mutexattr_setrobust
function specifies robustness attribute of the mutex.
Possible values for the

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