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__ppc_set_ppr_med.3: Document PPC functions providing access to PPR 

GNU C Library 2.18 adds functions (__ppc_set_ppr_low(3),
__ppc_set_ppr_med(3), __ppc_set_ppr_med_low(3)) that provide
access to the Program Priority Register (PPR).

Signed-off-by: Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Gabriel F. T. Gomes 2015-08-06 14:03:30 +02:00 committed by Michael Kerrisk
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.\" Copyright (c) 2015, IBM Corporation.
.\"
.\" %%%LICENSE_START(VERBATIM)
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.\" Process this file with
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.\"
.TH __PPC_SET_PPR_MED 3 2015-08-05 "GNU C Library" "Linux\
Programmer's Manual"
.SH NAME
__ppc_set_ppr_med, __ppc_set_ppr_low, __ppc_set_ppr_med_low \-
Set the Program Priority Register
.SH SYNOPSIS
.B #include <sys/platform/ppc.h>
.sp
.B void __ppc_set_ppr_med(void);
.br
.B void __ppc_set_ppr_low(void);
.br
.B void __ppc_set_ppr_med_low(void);
.SH DESCRIPTION
The functions
.BR __ppc_set_ppr_med (),
.BR __ppc_set_ppr_low ()
and
.BR __ppc_set_ppr_med_low ()
provide access to the
.I Program Priority Register
(PPR).
.P
The PPR is a 64-bit register that controls the program's priority.
By adjusting the PPR value the programmer may improve system
throughput by causing the system resources to be used more
efficiently, especially in contention situations.
The three unprivileged states available are covered by the functions
.BR __ppc_set_ppr_med (),
.BR __ppc_set_ppr_low ()
and
.BR __ppc_set_ppr_med_low ().
More information available in Power ISA 2.06b - Book II - Section 3.1.
.P
.BR __ppc_set_ppr_med ()
sets the Program Priority Register to medium value (default).
.P
.BR __ppc_set_ppr_low ()
sets the Program Priority Register to low value.
.P
.BR __ppc_set_ppr_med_low ()
sets the Program Priority Register to medium low value.
.SH VERSIONS
GNU C Library added support for
.BR __ppc_set_ppr_med (),
.BR __ppc_set_ppr_low ()
and
.BR __ppc_set_ppr_med_low ()
in version 2.18.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.TS
allbox;
lb lb lb
l l l.
Interface Attribute Value
T{
.BR __ppc_set_ppr_med (),
.BR __ppc_set_ppr_low (),
.BR __ppc_set_ppr_med_low ()
T} Thread safety MT-Safe
.TE
.ad
.SH CONFORMING TO
These functions are nonstandard GNU extensions.
.SH SEE ALSO
.BR __ppc_yield (3)