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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "PTHREAD_MUTEX_GETPRIOCEILING" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" pthread_mutex_getprioceiling 
+.SH NAME
+pthread_mutex_getprioceiling, pthread_mutex_setprioceiling \- get and
+set the priority ceiling of a mutex (\fBREALTIME
+THREADS\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <pthread.h>
+.br
+.sp
+int pthread_mutex_getprioceiling(const pthread_mutex_t *restrict\fP
+\fImutex\fP\fB,
+.br
+\ \ \ \ \ \  int *restrict\fP \fIprioceiling\fP\fB);
+.br
+int pthread_mutex_setprioceiling(pthread_mutex_t *restrict\fP \fImutex\fP\fB,
+.br
+\ \ \ \ \ \  int\fP \fIprioceiling\fP\fB, int *restrict\fP \fIold_ceiling\fP\fB);
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIpthread_mutex_getprioceiling\fP() function shall return the
+current priority ceiling of the mutex.
+.LP
+The \fIpthread_mutex_setprioceiling\fP() function shall either lock
+the mutex if it is unlocked, or block until it can
+successfully lock the mutex, then it shall change the mutex's priority
+ceiling and release the mutex. When the change is
+successful, the previous value of the priority ceiling shall be returned
+in \fIold_ceiling\fP. The process of locking the mutex
+need not adhere to the priority protect protocol.
+.LP
+If the \fIpthread_mutex_setprioceiling\fP() function fails, the mutex
+priority ceiling shall not be changed.
+.SH RETURN VALUE
+.LP
+If successful, the \fIpthread_mutex_getprioceiling\fP() and \fIpthread_mutex_setprioceiling\fP()
+functions shall return zero;
+otherwise, an error number shall be returned to indicate the error.
+.SH ERRORS
+.LP
+The \fIpthread_mutex_getprioceiling\fP() and \fIpthread_mutex_setprioceiling\fP()
+functions may fail if:
+.TP 7
+.B EINVAL
+The priority requested by \fIprioceiling\fP is out of range.
+.TP 7
+.B EINVAL
+The value specified by \fImutex\fP does not refer to a currently existing
+mutex.
+.TP 7
+.B EPERM
+The caller does not have the privilege to perform the operation.
+.sp
+.LP
+These functions shall not return an error code of [EINTR].
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIpthread_mutex_destroy\fP() , \fIpthread_mutex_lock\fP() , \fIpthread_mutex_timedlock\fP()
+, the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<pthread.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .