mirror of https://github.com/mkerrisk/man-pages
88 lines
2.9 KiB
Groff
88 lines
2.9 KiB
Groff
.\" Copyright (c) 2015, IBM Corporation.
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of
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.\" this manual under the conditions for verbatim copying, provided that
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.\" the entire resulting derived work is distributed under the terms of
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.\" a permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume.
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.\" no responsibility for errors or omissions, or for damages resulting.
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.\" from the use of the information contained herein. The author(s) may.
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.\" not have taken the same level of care in the production of this.
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.\" manual, which is licensed free of charge, as they might when working.
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.TH __PPC_YIELD 3 2021-03-22 "GNU C Library" "Linux Programmer's\
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Manual"
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.SH NAME
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__ppc_yield, __ppc_mdoio, __ppc_mdoom \-
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Hint the processor to release shared resources
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.SH SYNOPSIS
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.nf
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.B #include <sys/platform/ppc.h>
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.PP
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.B void __ppc_yield(void);
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.B void __ppc_mdoio(void);
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.B void __ppc_mdoom(void);
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.fi
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.SH DESCRIPTION
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These functions
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provide hints about the usage of resources that are shared with other
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processors on the Power architecture.
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They can be used, for example, if a program waiting on a lock intends
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to divert the shared resources to be used by other processors.
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.PP
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.BR __ppc_yield ()
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provides a hint that performance will probably be improved if shared
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resources dedicated to the executing processor are released for use by
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other processors.
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.PP
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.BR __ppc_mdoio ()
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provides a hint that performance will probably be improved if shared
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resources dedicated to the executing processor are released until all
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outstanding storage accesses to caching-inhibited storage have been
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completed.
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.PP
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.BR __ppc_mdoom ()
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provides a hint that performance will probably be improved if shared
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resources dedicated to the executing processor are released until all
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outstanding storage accesses to cacheable storage for which the data
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is not in the cache have been completed.
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.SH VERSIONS
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These functions first appeared in glibc in version 2.18.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.ad l
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.nh
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.TS
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allbox;
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lbx lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR __ppc_yield (),
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.BR __ppc_mdoio (),
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.BR __ppc_mdoom ()
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T} Thread safety MT-Safe
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.TE
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.hy
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.ad
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.sp 1
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.SH CONFORMING TO
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These functions are nonstandard GNU extensions.
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.SH SEE ALSO
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.BR __ppc_set_ppr_med (3)
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.PP
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.IR "Power ISA, Book\ II - Section\ 3.2 (""or"" architecture)"
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