.\" Copyright (c) 2015 Conrad Meyer .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' .\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED .\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR .\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE .\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS .\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN .\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE .\" POSSIBILITY OF SUCH DAMAGE. .\" .\" $FreeBSD$ .\" .Dd December 12, 2019 .Dt CPUSET 9 .Os .Sh NAME .Nm cpuset(9) \(em .Nm CPUSET_T_INITIALIZER , .Nm CPUSET_FSET , .Nm CPU_CLR , .Nm CPU_COPY , .Nm CPU_ISSET , .Nm CPU_SET , .Nm CPU_ZERO , .Nm CPU_FILL , .Nm CPU_SETOF , .Nm CPU_EMPTY , .Nm CPU_ISFULLSET , .Nm CPU_FFS , .Nm CPU_COUNT , .Nm CPU_SUBSET , .Nm CPU_OVERLAP , .Nm CPU_CMP , .Nm CPU_OR , .Nm CPU_AND , .Nm CPU_ANDNOT , .Nm CPU_XOR , .Nm CPU_CLR_ATOMIC , .Nm CPU_SET_ATOMIC , .Nm CPU_SET_ATOMIC_ACQ , .Nm CPU_AND_ATOMIC , .Nm CPU_OR_ATOMIC , .Nm CPU_COPY_STORE_REL .Nd cpuset manipulation macros .Sh SYNOPSIS .In sys/_cpuset.h .In sys/cpuset.h .\" .Fn CPUSET_T_INITIALIZER "ARRAY_CONTENTS" .Vt CPUSET_FSET .\" .Fn CPU_CLR "size_t cpu_idx" "cpuset_t *cpuset" .Fn CPU_COPY "cpuset_t *from" "cpuset_t *to" .Ft bool .Fn CPU_ISSET "size_t cpu_idx" "cpuset_t *cpuset" .Fn CPU_SET "size_t cpu_idx" "cpuset_t *cpuset" .Fn CPU_ZERO "cpuset_t *cpuset" .Fn CPU_FILL "cpuset_t *cpuset" .Fn CPU_SETOF "size_t cpu_idx" "cpuset_t *cpuset" .Ft bool .Fn CPU_EMPTY "cpuset_t *cpuset" .Ft bool .Fn CPU_ISFULLSET "cpuset_t *cpuset" .Ft int .Fn CPU_FFS "cpuset_t *cpuset" .Ft int .Fn CPU_COUNT "cpuset_t *cpuset" .\" .Ft bool .Fn CPU_SUBSET "cpuset_t *haystack" "cpuset_t *needle" .Ft bool .Fn CPU_OVERLAP "cpuset_t *cpuset1" "cpuset_t *cpuset2" .Ft bool .Fn CPU_CMP "cpuset_t *cpuset1" "cpuset_t *cpuset2" .Fn CPU_OR "cpuset_t *dst" "cpuset_t *src1" "cpuset_t *src2" .Fn CPU_AND "cpuset_t *dst" "cpuset_t *src1" "cpuset_t *src2" .Fn CPU_ANDNOT "cpuset_t *dst" "cpuset_t *src1" "cpuset_t *src2" .Fn CPU_XOR "cpuset_t *dst" "cpuset_t *src1" "cpuset_t *src2" .\" .Fn CPU_CLR_ATOMIC "size_t cpu_idx" "cpuset_t *cpuset" .Fn CPU_SET_ATOMIC "size_t cpu_idx" "cpuset_t *cpuset" .Fn CPU_SET_ATOMIC_ACQ "size_t cpu_idx" "cpuset_t *cpuset" .\" .Fn CPU_AND_ATOMIC "cpuset_t *dst" "cpuset_t *src" .Fn CPU_OR_ATOMIC "cpuset_t *dst" "cpuset_t *src" .Fn CPU_COPY_STORE_REL "cpuset_t *from" "cpuset_t *to" .Sh DESCRIPTION The .Nm family of macros provide a flexible and efficient CPU set implementation, backed by the .Xr bitset 9 macros. Each CPU is represented by a single bit. The maximum number of CPUs representable by .Vt cpuset_t is .Va MAXCPU . Individual CPUs in cpusets are referenced with indices zero through .Fa MAXCPU - 1 . .Pp The .Fn CPUSET_T_INITIALIZER macro allows one to initialize a .Vt cpuset_t with a compile time literal value. .Pp The .Fn CPUSET_FSET macro defines a compile time literal, usable by .Fn CPUSET_T_INITIALIZER , representing a full cpuset (all CPUs present). For examples of .Fn CPUSET_T_INITIALIZER and .Fn CPUSET_FSET usage, see the .Sx CPUSET_T_INITIALIZER EXAMPLE section. .Pp The .Fn CPU_CLR macro removes CPU .Fa cpu_idx from the cpuset pointed to by .Fa cpuset . The .Fn CPU_CLR_ATOMIC macro is identical, but the bit representing the CPU is cleared with atomic machine instructions. .Pp The .Fn CPU_COPY macro copies the contents of the cpuset .Fa from to the cpuset .Fa to . .Fn CPU_COPY_STORE_REL is similar, but copies component machine words from .Fa from and writes them to .Fa to with atomic store with release semantics. (That is, if .Fa to is composed of multiple machine words, .Fn CPU_COPY_STORE_REL performs multiple individually atomic operations.) .Pp The .Fn CPU_SET macro adds CPU .Fa cpu_idx to the cpuset pointed to by .Fa cpuset , if it is not already present. The .Fn CPU_SET_ATOMIC macro is identical, but the bit representing the CPU is set with atomic machine instructions. The .Fn CPU_SET_ATOMIC_ACQ macro sets the bit representing the CPU with atomic acquire semantics. .Pp The .Fn CPU_ZERO macro removes all CPUs from .Fa cpuset . .Pp The .Fn CPU_FILL macro adds all CPUs to .Fa cpuset . .Pp The .Fn CPU_SETOF macro removes all CPUs in .Fa cpuset before adding only CPU .Fa cpu_idx . .Pp The .Fn CPU_EMPTY macro returns .Dv true if .Fa cpuset is empty. .Pp The .Fn CPU_ISFULLSET macro returns .Dv true if .Fa cpuset is full (the set of all CPUs). .Pp The .Fn CPU_FFS macro returns the 1-index of the first (lowest) CPU in .Fa cpuset , or zero if .Fa cpuset is empty. Like with .Xr ffs 3 , to use the non-zero result of .Fn CPU_FFS as a .Fa cpu_idx index parameter to any other .Nm macro, you must subtract one from the result. .Pp The .Fn CPU_COUNT macro returns the total number of CPUs in .Fa cpuset . .Pp The .Fn CPU_SUBSET macro returns .Dv true if .Fa needle is a subset of .Fa haystack . .Pp The .Fn CPU_OVERLAP macro returns .Dv true if .Fa cpuset1 and .Fa cpuset2 have any common CPUs. (That is, if .Fa cpuset1 AND .Fa cpuset2 is not the empty set.) .Pp The .Fn CPU_CMP macro returns .Dv true if .Fa cpuset1 is NOT equal to .Fa cpuset2 . .Pp The .Fn CPU_OR macro adds CPUs present in .Fa src to .Fa dst . (It is the .Nm equivalent of the scalar: .Fa dst |= .Fa src . ) .Fn CPU_OR_ATOMIC is similar, but sets the bits representing CPUs in the component machine words in .Fa dst with atomic machine instructions. (That is, if .Fa dst is composed of multiple machine words, .Fn CPU_OR_ATOMIC performs multiple individually atomic operations.) .Pp The .Fn CPU_AND macro removes CPUs absent from .Fa src from .Fa dst . (It is the .Nm equivalent of the scalar: .Fa dst &= .Fa src . ) .Fn CPU_AND_ATOMIC is similar, with the same atomic semantics as .Fn CPU_OR_ATOMIC . .Pp The .Fn CPU_ANDNOT macro removes CPUs in .Fa src from .Fa dst . (It is the .Nm equivalent of the scalar: .Fa dst &= .Fa ~ src . ) .Sh CPUSET_T_INITIALIZER EXAMPLE .Bd -literal cpuset_t myset; /* Initialize myset to filled (all CPUs) */ myset = CPUSET_T_INITIALIZER(CPUSET_FSET); /* Initialize myset to only the lowest CPU */ myset = CPUSET_T_INITIALIZER(0x1); .Ed .Sh SEE ALSO .Xr cpuset 1 , .Xr cpuset 2 , .Xr bitset 9 .Sh HISTORY .In sys/cpuset.h first appeared in .Fx 7.1 , released in January 2009, and in .Fx 8.0 , released in November 2009. .Pp This manual page first appeared in .Fx 11.0 . .Sh AUTHORS .An -nosplit The .Nm macros were written by .An Jeff Roberson Aq Mt jeff@FreeBSD.org . This manual page was written by .An Conrad Meyer Aq Mt cem@FreeBSD.org . .Sh CAVEATS Unlike every other reference to individual set members, which are zero-indexed, .Fn CPU_FFS returns a one-indexed result (or zero if the cpuset is empty).