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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "PTHREAD_MUTEXATTR_GETPROTOCOL" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" pthread_mutexattr_getprotocol 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+pthread_mutexattr_getprotocol, pthread_mutexattr_setprotocol \- get
+and set the protocol attribute of the mutex
+attributes object (\fBREALTIME THREADS\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <pthread.h>
+.br
+.sp
+\fBint pthread_mutexattr_getprotocol(const pthread_mutexattr_t *
+.br
+\ \ \ \ \ \  restrict\fP \fIattr\fP\fB, int *restrict\fP \fIprotocol\fP\fB);
+.br
+int pthread_mutexattr_setprotocol(pthread_mutexattr_t *\fP\fIattr\fP\fB,
+.br
+\ \ \ \ \ \  int\fP \fIprotocol\fP\fB); \fP
+.sp
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIpthread_mutexattr_getprotocol\fP() and \fIpthread_mutexattr_setprotocol\fP()
+functions, respectively, shall get and set
+the protocol attribute of a mutex attributes object pointed to by
+\fIattr\fP which was previously created by the function \fIpthread_mutexattr_init\fP().
+.LP
+The \fIprotocol\fP attribute defines the protocol to be followed in
+utilizing mutexes. The value of \fIprotocol\fP may be one
+of:
+.LP
+.sp
+PTHREAD_PRIO_NONE
+.br
+.sp
+PTHREAD_PRIO_INHERIT
+.br
+.sp
+.sp
+PTHREAD_PRIO_PROTECT
+.br
+.sp
+.LP
+which are defined in the \fI<pthread.h>\fP header.
+.LP
+When a thread owns a mutex with the PTHREAD_PRIO_NONE \fIprotocol\fP
+attribute, its priority and scheduling shall not be
+affected by its mutex ownership.
+.LP
+When a thread is blocking higher priority threads because of owning
+one or more mutexes with the PTHREAD_PRIO_INHERIT
+\fIprotocol\fP attribute, it shall execute at the higher of its priority
+or the priority of the highest priority thread waiting on
+any of the mutexes owned by this thread and initialized with this
+protocol. 
+.LP
+When a thread owns one or more mutexes initialized with the PTHREAD_PRIO_PROTECT
+protocol, it shall execute at the higher of its
+priority or the highest of the priority ceilings of all the mutexes
+owned by this thread and initialized with this attribute,
+regardless of whether other threads are blocked on any of these mutexes
+or not. 
+.LP
+While a thread is holding a mutex which has been initialized with
+the PTHREAD_PRIO_INHERIT or PTHREAD_PRIO_PROTECT protocol
+attributes, it shall not be subject to being moved to the tail of
+the scheduling queue at its priority in the event that its
+original priority is changed, such as by a call to \fIsched_setparam\fP().
+Likewise, when a thread unlocks a mutex that has been initialized
+with the PTHREAD_PRIO_INHERIT or PTHREAD_PRIO_PROTECT protocol
+attributes, it shall not be subject to being moved to the tail of
+the scheduling queue at its priority in the event that its
+original priority is changed.
+.LP
+If a thread simultaneously owns several mutexes initialized with different
+protocols, it shall execute at the highest of the
+priorities that it would have obtained by each of these protocols.
+.LP
+When a thread makes a call to \fIpthread_mutex_lock\fP(), the mutex
+was
+initialized with the protocol attribute having the value PTHREAD_PRIO_INHERIT,
+when the calling thread is blocked because the mutex
+is owned by another thread, that owner thread shall inherit the priority
+level of the calling thread as long as it continues to own
+the mutex. The implementation shall update its execution priority
+to the maximum of its assigned priority and all its inherited
+priorities. Furthermore, if this owner thread itself becomes blocked
+on another mutex, the same priority inheritance effect shall
+be propagated to this other owner thread, in a recursive manner. 
+.SH RETURN VALUE
+.LP
+Upon successful completion, the \fIpthread_mutexattr_getprotocol\fP()
+and \fIpthread_mutexattr_setprotocol\fP() functions
+shall return zero; otherwise, an error number shall be returned to
+indicate the error.
+.SH ERRORS
+.LP
+The \fIpthread_mutexattr_setprotocol\fP() function shall fail if:
+.TP 7
+.B ENOTSUP
+The value specified by \fIprotocol\fP is an unsupported value.
+.sp
+.LP
+The \fIpthread_mutexattr_getprotocol\fP() and \fIpthread_mutexattr_setprotocol\fP()
+functions may fail if:
+.TP 7
+.B EINVAL
+The value specified by \fIattr\fP or \fIprotocol\fP is invalid.
+.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_cond_destroy\fP(), \fIpthread_create\fP(), \fIpthread_mutex_destroy\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 .