__ppc_set_ppr_med.3: Document PPC functions providing access to PPR

GNU C Library commit 1747fcda4902a3b46183d93fb16ed9b436b2608b
extends the priorities that can be set to the Program Priority
Register (PPR), with the functions: __ppc_set_ppr_very_low(3)
and __ppc_set_ppr_med_high(3).

Signed-off-by: Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man3/__ppc_set_ppr_med.3 b/man3/__ppc_set_ppr_med.3
index b106647aa45c70ed1994722943dddb19a7d752c5..2fd5d6f0b6d09d73031e565a95ac3455bd4a8d01 100644 (file)
--- a/man3/__ppc_set_ppr_med.3
+++ b/man3/__ppc_set_ppr_med.3
@@ -25,16 +25,20 @@
 .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 \-
+__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 SYNOPSIS
 .B #include <sys/platform/ppc.h>
 .sp
 .B void __ppc_set_ppr_med(void);
 .br
+.B void __ppc_set_ppr_very_low(void);
+.br
 .B void __ppc_set_ppr_low(void);
 .br
 .B void __ppc_set_ppr_med_low(void);
+.br
+.B void __ppc_set_ppr_med_high(void);
 .SH DESCRIPTION
 These functions provide access to the
 .I Program Priority Register
@@ -44,13 +48,17 @@ 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 three unprivileged states available are covered by the following functions:
+The four unprivileged states available are covered by the following functions:
 .IP * 3
 .BR __ppc_set_ppr_med ()
 sets the Program Priority Register value to
 .IR medium
 (default).
 .IP *
+.BR __ppc_set_ppr_very_low ()
+sets the Program Priority Register value to
+.IR "very low" .
+.IP *
 .BR __ppc_set_ppr_low ()
 sets the Program Priority Register value to
 .IR low .
@@ -58,8 +66,31 @@ sets the Program Priority Register value to
 .BR __ppc_set_ppr_med_low ()
 sets the Program Priority Register value to
 .IR "medium low" .
+.P
+The privileged state
+.IR "medium high"
+may also be set during certain time intervals by problem-state (unprivileged)
+programs, with the following function:
+.IP * 3
+.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 VERSIONS
-These functions first appeared in glibc in version 2.18.
+The functions
+.BR __ppc_set_ppr_med (),
+.BR __ppc_set_ppr_low ()
+and
+.BR __ppc_set_ppr_med_low ()
+are provided by glibc since version 2.18.
+The functions
+.BR __ppc_set_ppr_very_low ()
+and
+.BR __ppc_set_ppr_med_high ()
+first appeared in glibc in version 2.23.
 .SH ATTRIBUTES
 For an explanation of the terms used in this section, see
 .BR attributes (7).
@@ -71,8 +102,10 @@ l l l.
 Interface      Attribute       Value
 T{
 .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_low (),
+.BR __ppc_set_ppr_med_high ()
 T}     Thread safety   MT-Safe
 .TE
 .ad