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+.\" Copyright (c) 2017, Michael Kerrisk <mtk.manpages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH pthread_mutexattr_getpshared 3 2024-05-02 "Linux man-pages (unreleased)"
+.SH NAME
+pthread_mutexattr_getpshared, pthread_mutexattr_setpshared \- get/set
+process-shared mutex attribute
+.SH LIBRARY
+POSIX threads library
+.RI ( libpthread ", " \-lpthread )
+.SH SYNOPSIS
+.nf
+.B #include <pthread.h>
+.P
+.B int pthread_mutexattr_getpshared(
+.BI "                      const pthread_mutexattr_t *restrict " attr ,
+.BI "                      int *restrict " pshared );
+.BI "int pthread_mutexattr_setpshared(pthread_mutexattr_t *" attr ,
+.BI "                      int " pshared );
+.fi
+.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.
+.P
+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.
+.P
+.BR pthread_mutexattr_getpshared ()
+places the value of the process-shared attribute of
+the mutex attributes object referred to by
+.I attr
+in the location pointed to by
+.IR pshared .
+.P
+.BR pthread_mutexattr_setpshared ()
+sets the value of the process-shared attribute of
+the mutex attributes object referred to by
+.I attr
+to the value specified in
+.BR pshared .
+.P
+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
+.B PTHREAD_PROCESS_SHARED
+but the implementation does not support process-shared mutexes.
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+POSIX.1-2001.
+.SH SEE ALSO
+.ad l
+.nh
+.BR pthread_mutexattr_init (3),
+.BR pthreads (7)