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+.\" Copyright (c) 2017, Michael Kerrisk <mtk.manpages@gmail.com>
+.\"
+.\" %%%LICENSE_START(VERBATIM)
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\"
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\"
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\" %%%LICENSE_END
+.\"
+.TH PTHREAD_MUTEXATTR_GETPSHARED 3 2017-09-13 "Linux" "Linux Programmer's Manual"
+.SH NAME
+pthread_mutexattr_getpshared, pthread_mutexattr_setpshared \- get/set
+process-shared mutex attribute
+.SH SYNOPSIS
+.nf
+.B #include <pthread.h>
+.PP
+.BI "int pthread_mutexattr_getpshared(const pthread_mutexattr_t *" attr ,
+.BI "                                 int *" pshared );
+.BI "int pthread_mutexattr_setpshared(pthread_mutexattr_t *" attr ,
+.BI "                                 int " pshared );
+.fi
+.PP
+Compile and link with \fI\-pthread\fP.
+.SH DESCRIPTION
+These functions get and set the process-shared attribute
+in a mutex attributes object.
+This attribute must be appropriately set to ensure correct,
+efficient operation of a mutex created using this attributes object.
+.PP
+The process-shared attribute can have one of the following values:
+.TP
+.B PTHREAD_PROCESS_PRIVATE
+Mutexes created with this attributes object are to be shared
+only among threads in the same process that initialized the mutex.
+This is the default value for the process-shared mutex attribute.
+.TP
+.B PTHREAD_PROCESS_SHARED
+Mutexes created with this attributes object can be shared between
+any threads that have access to the memory containing the object,
+including threads in different processes.
+.PP
+.BR pthread_mutexattr_getpshared ()
+places the value of the process-shared attribute of
+the mutex attributes object referred to by
+.IR attr
+in the location pointed to by
+.IR pshared .
+.PP
+.BR pthread_mutexattr_setpshared ()
+sets the value of the process-shared attribute of
+the mutex attributes object referred to by
+.IR attr
+to the value specified in
+.BR pshared .
+.PP
+If
+.I attr
+does not refer to an initialized mutex attributes object,
+the behavior is undefined.
+.SH RETURN VALUE
+On success, these functions return 0.
+On error, they return a positive error number.
+.SH ERRORS
+.BR pthread_mutexattr_setpshared ()
+can fail with the following errors:
+.TP
+.B EINVAL
+The value specified in
+.I pshared
+is invalid.
+.TP
+.B ENOTSUP
+.I pshared is
+.BR PTHREAD_PROCESS_SHARED
+but the implementation does not support process-shared mutexes.
+.SH CONFORMING TO
+POSIX.1-2001, POSIX.1-2008.
+.SH SEE ALSO
+.ad l
+.nh
+.BR pthread_mutexattr_init (3),
+.BR pthreads (7)