From 3d08cd331c1adcf0d917392f7e527b3f00511748 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 24 May 2024 06:52:22 +0200 Subject: Merging upstream version 6.8. Signed-off-by: Daniel Baumann --- man/man3/__ppc_set_ppr_med.3 | 113 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 man/man3/__ppc_set_ppr_med.3 (limited to 'man/man3/__ppc_set_ppr_med.3') diff --git a/man/man3/__ppc_set_ppr_med.3 b/man/man3/__ppc_set_ppr_med.3 new file mode 100644 index 0000000..dbfdced --- /dev/null +++ b/man/man3/__ppc_set_ppr_med.3 @@ -0,0 +1,113 @@ +'\" t +.\" Copyright (c) 2015, 2016 IBM Corporation. +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH __ppc_set_ppr_med 3 2024-05-02 "Linux man-pages (unreleased)" +Programmer's Manual" +.SH NAME +__ppc_set_ppr_med, __ppc_set_ppr_very_low, __ppc_set_ppr_low, +__ppc_set_ppr_med_low, __ppc_set_ppr_med_high \- +Set the Program Priority Register +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include +.P +.B void __ppc_set_ppr_med(void); +.B void __ppc_set_ppr_very_low(void); +.B void __ppc_set_ppr_low(void); +.B void __ppc_set_ppr_med_low(void); +.B void __ppc_set_ppr_med_high(void); +.fi +.SH DESCRIPTION +These functions provide access to the +.I Program Priority Register +(PPR) on the Power architecture. +.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 system resources to be used more +efficiently, especially in contention situations. +The available unprivileged states are covered by the following functions: +.TP +.BR __ppc_set_ppr_med () +sets the Program Priority Register value to +.I medium +(default). +.TP +.BR __ppc_set_ppr_very_low () +sets the Program Priority Register value to +.IR "very low" . +.TP +.BR __ppc_set_ppr_low () +sets the Program Priority Register value to +.IR low . +.TP +.BR __ppc_set_ppr_med_low () +sets the Program Priority Register value to +.IR "medium low" . +.P +The privileged state +.I medium high +may also be set during certain time intervals by problem-state (unprivileged) +programs, with the following function: +.TP +.BR __ppc_set_ppr_med_high () +sets the Program Priority to +.IR "medium high" . +.P +If the program priority is medium high when the time interval expires or if an +attempt is made to set the priority to medium high when it is not allowed, the +priority is set to medium. +.SH ATTRIBUTES +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.na +.nh +.BR __ppc_set_ppr_med (), +.BR __ppc_set_ppr_very_low (), +.BR __ppc_set_ppr_low (), +.BR __ppc_set_ppr_med_low (), +.BR __ppc_set_ppr_med_high () +T} Thread safety MT-Safe +.TE +.SH STANDARDS +GNU. +.SH HISTORY +.TP +.BR __ppc_set_ppr_med () +.TQ +.BR __ppc_set_ppr_low () +.TQ +.BR __ppc_set_ppr_med_low () +glibc 2.18. +.TP +.BR __ppc_set_ppr_very_low () +.TQ +.BR __ppc_set_ppr_med_high () +glibc 2.23. +.SH NOTES +The functions +.BR __ppc_set_ppr_very_low () +and +.BR __ppc_set_ppr_med_high () +will be defined by +.I +if +.B _ARCH_PWR8 +is defined. +Availability of these functions can be tested using +.BR "#ifdef _ARCH_PWR8" . +.SH SEE ALSO +.BR __ppc_yield (3) +.P +.I Power ISA, Book\~II - Section\ 3.1 (Program Priority Registers) -- cgit v1.2.3