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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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__ppc_set_ppr_med(3) Library Functions Manual __ppc_set_ppr_med(3)
Programmer's Manual"
__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
Standard C library (libc, -lc)
#include <sys/platform/ppc.h>
void __ppc_set_ppr_med(void);
void __ppc_set_ppr_very_low(void);
void __ppc_set_ppr_low(void);
void __ppc_set_ppr_med_low(void);
void __ppc_set_ppr_med_high(void);
These functions provide access to the Program Priority Register
(PPR) on the Power architecture.
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:
__ppc_set_ppr_med()
sets the Program Priority Register value to medium
(default).
__ppc_set_ppr_very_low()
sets the Program Priority Register value to very low.
__ppc_set_ppr_low()
sets the Program Priority Register value to low.
__ppc_set_ppr_med_low()
sets the Program Priority Register value to medium low.
The privileged state medium high may also be set during certain
time intervals by problem-state (unprivileged) programs, with the
following function:
__ppc_set_ppr_med_high()
sets the Program Priority to medium high.
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.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ __ppc_set_ppr_med(), │ Thread safety │ MT-Safe │
│ __ppc_set_ppr_very_low(), │ │ │
│ __ppc_set_ppr_low(), │ │ │
│ __ppc_set_ppr_med_low(), │ │ │
│ __ppc_set_ppr_med_high() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
GNU.
__ppc_set_ppr_med()
__ppc_set_ppr_low()
__ppc_set_ppr_med_low()
glibc 2.18.
__ppc_set_ppr_very_low()
__ppc_set_ppr_med_high()
glibc 2.23.
The functions __ppc_set_ppr_very_low() and
__ppc_set_ppr_med_high() will be defined by <sys/platform/ppc.h>
if _ARCH_PWR8 is defined. Availability of these functions can be
tested using #ifdef _ARCH_PWR8.
__ppc_yield(3)
Power ISA, Book II - Section 3.1 (Program Priority Registers)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.10.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-02-02. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.10 2024-07-23 __ppc_set_ppr_med(3)
Pages that refer to this page: __ppc_yield(3)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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