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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man2 / sched_setaffinity.2

.\" man2/sched_setaffinity.2 - sched_setaffinity and sched_getaffinity man page
.\"
.\" Copyright (C) 2002 Robert Love
.\" and Copyright (C) 2006 Michael Kerrisk
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, write to the Free
.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
.\" USA.
.\"
.\" 2002-11-19 Robert Love <rml@tech9.net> - initial version
.\" 2004-04-20 mtk - fixed description of return value
.\" 2004-04-22 aeb - added glibc prototype history
.\" 2005-05-03 mtk - noted that sched_setaffinity may cause thread
.\"     migration and that CPU affinity is a per-thread attribute.
.\" 2006-02-03 mtk -- Major rewrite
.\" 2008-11-12, mtk, removed CPU_*() macro descriptions to a
.\" separate CPU_SET(3) page.
.\"
.\" Japanese Version Copyright (c) 2003, 2005 Yuichi SATO
.\"         all rights reserved.
.\" Translated 2003-01-23, Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated & Modified 2003-09-23, Yuichi SATO
.\" Updated & Modified 2005-01-03, Yuichi SATO
.\" Updated & Modified 2005-09-13, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated & Modified 2006-07-14, Akihiro MOTOKI, LDP v2.34
.\" Updated & Modified 2008-12-24, Akihiro MOTOKI, LDP v3.14
.\"
.\"WORD:        affinity                ¿ÆÏÂÅÙ
.\"WORD:        most significant bit    ºÇ¾å°Ì¥Ó¥Ã¥È
.\"WORD:        least significant bit   ºÇ²¼°Ì¥Ó¥Ã¥È
.\"WORD:        capability              ¸¢¸Â
.\"
.TH SCHED_SETAFFINITY 2 2008-11-14 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O sched_setaffinity, sched_getaffinity \- \
.\"O set and get a process's CPU affinity mask
sched_setaffinity, sched_getaffinity \- \
¥×¥í¥»¥¹¤Î CPU affinity ¥Þ¥¹¥¯¤òÀßÄꡦ¼èÆÀ¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B #define _GNU_SOURCE
.B #include <sched.h>
.sp
.BI "int sched_setaffinity(pid_t " pid ", size_t " cpusetsize ,
.BI "                      cpu_set_t *" mask );
.sp
.BI "int sched_getaffinity(pid_t " pid ", size_t " cpusetsize ,
.BI "                      cpu_set_t *" mask );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"Osato:
.\"Osato: Kernel ¥É¥­¥å¥á¥ó¥È IRQ-affinity.txt ¤ÎÌõ¤Ç¤Ï¡¢
.\"Osato: "affinity" ¤Ï¡Ö¥¢¥Õ¥£¥Ë¥Æ¥£¡×¤Ë¤Ê¤Ã¤Æ¤¤¤Þ¤¹¤¬¡¢
.\"Osato: ¤³¤³¤Ë°ì²ó¤À¤±Ìõ¸ì (¿ÆÏÂÅÙ) ¤òÆþ¤ì¤Æ¤ª¤¯¤À¤±¤Ç¡¢
.\"Osato: ÆäËÌõ¤µ¤Ê¤¤¤³¤È¤Ë¤·¤è¤¦¤È»×¤¤¤Þ¤¹¡£
.\"Osato:
.\"O A process's CPU affinity mask determines the set of CPUs on which
.\"O it is eligible to run.
.\"O On a multiprocessor system, setting the CPU affinity mask
.\"O can be used to obtain performance benefits.
.\"O For example,
.\"O by dedicating one CPU to a particular process
.\"O (i.e., setting the affinity mask of that process to specify a single CPU,
.\"O and setting the affinity mask of all other processes to exclude that CPU),
.\"O it is possible to ensure maximum execution speed for that process.
.\"O Restricting a process to run on a single CPU also avoids
.\"O the performance cost caused by the cache invalidation that occurs
.\"O when a process ceases to execute on one CPU and then
.\"O recommences execution on a different CPU.
¥×¥í¥»¥¹¤Î CPU affinity (¿ÆÏÂÅÙ) ¥Þ¥¹¥¯¤Ï¡¢¤½¤Î¥×¥í¥»¥¹¤¬
¼Â¹Ô¤òµö²Ä¤µ¤ì¤Æ¤¤¤ë CPU ¤Î½¸¹ç¤ò·èÄꤹ¤ë¡£
¥Þ¥ë¥Á¥×¥í¥»¥Ã¥µ¡¦¥·¥¹¥Æ¥à¤Ç¤Ï¡¢CPU affinity ¥Þ¥¹¥¯¤òÀßÄꤹ¤ë¤³¤È¤Ç
À­Ç½¾å¤Î¥á¥ê¥Ã¥È¤òÆÀ¤é¤ì¤ë²ÄǽÀ­¤¬¤¢¤ë¡£
Î㤨¤Ð¡¢ÆÃÄê¤Î¥×¥í¥»¥¹¤ò°ì¤Ä¤Î CPU ¤Ë³ç¤êÉÕ¤±
(¤¹¤Ê¤ï¤Á¡¢¤½¤Î¥×¥í¥»¥¹¤Î affinity ¥Þ¥¹¥¯¤ò°ì¤Ä¤Î CPU ¤ËÀßÄꤷ)¡¢
¾¤ÎÁ´¤Æ¤Î¥×¥í¥»¥¹¤Î affinity ¥Þ¥¹¥¯¤«¤é¤½¤Î CPU ¤ò½ü³°¤¹¤ë¤³¤È¤Ç¡¢
³Î¼Â¤Ë¤½¤Î¥×¥í¥»¥¹¤Î¼Â¹Ô®ÅÙ¤òºÇÂç¤Ë¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
¤Þ¤¿¡¢¤¢¤ë¥×¥í¥»¥¹¤Î¼Â¹Ô¤ò°ì¤Ä¤Î CPU ¤Ë¸ÂÄꤹ¤ë¤³¤È¤Ç¡¢
°ì¤Ä¤Î CPU ¤Ç¤Î¼Â¹Ô¤òÄä»ß¤·¤Æ¤«¤éÊ̤ΠCPU ¤Ç¼Â¹Ô¤òºÆ³«¤¹¤ë¤È¤­¤ËȯÀ¸¤¹¤ë
¥­¥ã¥Ã¥·¥å̵¸ú²½ (cache invalidation) ¤Ë¤è¤ëÀ­Ç½Ì̤ÎÎô²½¤òÈò¤±¤ë¤³¤È¤â¤Ç¤­¤ë¡£

.\"O A CPU affinity mask is represented by the
.\"O .I cpu_set_t
.\"O structure, a "CPU set", pointed to by
.\"O .IR mask .
CPU affinity ¥Þ¥¹¥¯¤Ï¡ÖCPU ¤Î½¸¹ç¡×¤òɽ¤¹
.I cpu_set_t
¹½Â¤ÂΤÇɽ¸½¤µ¤ì¡¢
.I cpu_set_t
¤Ø¤Î¥Ý¥¤¥ó¥¿
.I mask
¤Ç»ØÄꤵ¤ì¤ë¡£
.\"O A set of macros for manipulating CPU sets is described in
.\"O .BR CPU_SET (3).
CPU ½¸¹ç¤òÁàºî¤¹¤ë¤¿¤á¤Î¥Þ¥¯¥í·²¤Ë¤Ä¤¤¤Æ¤Ï
.BR CPU_SET (3)
¤Çµ­ºÜ¤µ¤ì¤Æ¤¤¤ë¡£

.\"O .BR sched_setaffinity ()
.\"O sets the CPU affinity mask of the process whose ID is
.\"O .I pid
.\"O to the value specified by
.\"O .IR mask .
.BR sched_setaffinity ()
¤Ï¡¢¥×¥í¥»¥¹ID ¤¬
.I pid
¤Î¥×¥í¥»¥¹¤Î CPU affinity ¥Þ¥¹¥¯¤ò
.I mask
¤Ç»ØÄꤵ¤ì¤¿ÃͤËÀßÄꤹ¤ë¡£
.\"O If
.\"O .I pid
.\"O is zero, then the calling process is used.
.\"O The argument
.\"O .I cpusetsize
.\"O is the length (in bytes) of the data pointed to by
.\"O .IR mask .
.I pid
¤¬ 0 ¤Î¾ì¹ç¡¢¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤¬»È¤ï¤ì¤ë¡£
.I cpusetsize
°ú¤­¿ô¤Ë¤Ï
.I mask
¤¬»Ø¤¹¥Ç¡¼¥¿¤ÎŤµ (¥Ð¥¤¥Èñ°Ì) ¤Ç¤¢¤ë¡£
.\"O Normally this argument would be specified as
.\"O .IR "sizeof(cpu_set_t)" .
Ä̾ï¤Ï¡¢¤³¤Î°ú¤­¿ô¤Ë¤Ï
.I "sizeof(cpu_set_t)"
¤ò»ØÄꤹ¤ì¤Ð¤è¤¤¡£

.\"O If the process specified by
.\"O .I pid
.\"O is not currently running on one of the CPUs specified in
.\"O .IR mask ,
.\"O then that process is migrated to one of the CPUs specified in
.\"O .IR mask .
.I pid
¤Ç»ØÄꤵ¤ì¤¿¥×¥í¥»¥¹¤¬
.I mask
¤Ç»ØÄꤵ¤ì¤¿ CPU ¤Î¤¤¤º¤ì¤«¤Ç¸½ºß¼Â¹Ô¤µ¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç¡¢
¤½¤Î¥×¥í¥»¥¹¤Ï
.I mask
¤Ç»ØÄꤵ¤ì¤¿ CPU ¤Î¤¤¤º¤ì¤«¤Ë°ÜÆ°¤µ¤ì¤ë¡£

.\"O .BR sched_getaffinity ()
.\"O writes the affinity mask of the process whose ID is
.\"O .I pid
.\"O into the
.\"O .I cpu_set_t
.\"O structure pointed to by
.\"O .IR mask .
.\"O The
.\"O .I cpusetsize
.\"O argument specifies the size (in bytes) of
.\"O .IR mask .
.BR sched_getaffinity ()
¤Ï¡¢
¥×¥í¥»¥¹ID ¤¬
.I pid
¤Î¥×¥í¥»¥¹¤Î affinity ¥Þ¥¹¥¯¤ò
.I mask
¤¬»Ø¤¹
.I cpu_set_t
¹½Â¤ÂΤ˽ñ¤­¹þ¤à¡£
.I cpusetsize
°ú¤­¿ô¤Ë¤Ï
.I mask
¤Î (¥Ð¥¤¥Èñ°Ì¤Î) Â礭¤µ¤ò»ØÄꤹ¤ë¡£

´Ø¿ô
.BR sched_getaffinity ()
¤ÏŤµ
.I len
¤Î¥Ý¥¤¥ó¥¿
.I mask
¤Ë¥×¥í¥»¥¹
.I pid
¤Î affinity ¥Þ¥¹¥¯¤ò½ñ¤­¹þ¤à¡£
.\"O If
.\"O .I pid
.\"O is zero, then the mask of the calling process is returned.
.I pid
¤¬ 0 ¤Î¾ì¹ç¡¢¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤Î¥Þ¥¹¥¯¤¬ÊÖ¤µ¤ì¤ë¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On success,
.\"O .BR sched_setaffinity ()
.\"O and
.\"O .BR sched_getaffinity ()
.\"O return 0.
À®¸ù¤·¤¿¾ì¹ç¡¢
.BR sched_setaffinity ()
¤È
.BR sched_getaffinity ()
¤Ï 0 ¤òÊÖ¤¹¡£
.\"O On error, \-1 is returned, and
.\"O .I errno
.\"O is set appropriately.
¥¨¥é¡¼¤Î¾ì¹ç¤Ï \-1 ¤òÊÖ¤·¡¢
.I errno
¤òŬÀÚ¤ËÀßÄꤹ¤ë¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.TP
.B EFAULT
.\"O A supplied memory address was invalid.
»ØÄꤵ¤ì¤¿¥á¥â¥êÈÖÃϤ¬ÉÔÀµ¤Ç¤¢¤ë¡£
.TP
.B EINVAL
.\"O The affinity bit mask
.\"O .I mask
.\"O contains no processors that are currently physically on the system
.\"O and permitted to the process according to any restrictions that
.\"O may be imposed by the "cpuset" mechanism described in
.\"O .BR cpuset (7).
¥·¥¹¥Æ¥à¾å¤Ë¸½ºß¼ÂºÝ¤Ë¸ºß¤·¡¢¤«¤Ä
"cpuset" µ¡¹½¤¬²Ý¤¹À©¸Â¤Ë¤ª¤¤¤Æ¤½¤Î¥×¥í¥»¥¹¤ËÂФ·¤Æµö²Ä¤µ¤ì¤Æ¤¤¤ë
¥×¥í¥»¥Ã¥µ¤¬¡¢
affinity ¥Ó¥Ã¥È¥Þ¥¹¥¯
.I mask
¤Ë´Þ¤Þ¤ì¤Æ¤¤¤Ê¤¤¡£
"cpuset" µ¡¹½¤Ë¤Ä¤¤¤Æ¤Ï
.BR cpuset (7)
¤ò»²¾È¡£
.TP
.B EINVAL
.\"O .RB ( sched_getaffinity ()
.\"O and, in kernels before 2.6.9,
.\"O .BR sched_setaffinity ())
.\"O .I cpusetsize
.\"O is smaller than the size of the affinity mask used by the kernel.
.RB ( sched_getaffinity ()
¤È¡¢¥«¡¼¥Í¥ë 2.6.9 °ÊÁ°¤Î
.BR sched_setaffinity ())
.I cpusetsize
¤¬¥«¡¼¥Í¥ë¤Ç»È¤ï¤ì¤Æ¤¤¤ë affinity ¥Þ¥¹¥¯¤Î¥µ¥¤¥º¤è¤ê¾®¤µ¤¤¡£
.TP
.B EPERM
.\"O .RB ( sched_setaffinity ())
.\"O The calling process does not have appropriate privileges.
.\"O The caller needs an effective user ID equal to the user ID
.\"O or effective user ID of the process identified by
.\"O .IR pid ,
.\"O or it must possess the
.\"O .B CAP_SYS_NICE
.\"O capability.
.RB ( sched_setaffinity ())
¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤ËŬÀÚ¤ÊÆø¢¤¬¤Ê¤«¤Ã¤¿¡£
¸Æ¤Ó½Ð¤·¸µ¤Ï¡¢¼Â¸ú¥æ¡¼¥¶ ID ¤¬
.I pid
¤Ç¼±Ê̤µ¤ì¤ë¥×¥í¥»¥¹¤Î¥æ¡¼¥¶ ID ¤Þ¤¿¤Ï¼Â¸ú¥æ¡¼¥¶ ID ¤ÈƱ¤¸¤Ç¤¢¤ë¤«¡¢
.B CAP_SYS_NICE
¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£ (capability) ¤ò»ý¤¿¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
.TP
.B ESRCH
.\"O The process whose ID is \fIpid\fP could not be found.
¥×¥í¥»¥¹ ID \fIpid\fP ¤Î¥×¥í¥»¥¹¤¬¸«¤Ä¤«¤é¤Ê¤«¤Ã¤¿¡£
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O The CPU affinity system calls were introduced in Linux kernel 2.5.8.
CPU affinity ¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï Linux kernel 2.5.8 ¤ÇƳÆþ¤µ¤ì¤¿¡£
.\"O The system call wrappers were introduced in glibc 2.3.
.\"O Initially, the glibc interfaces included a
.\"O .I cpusetsize
.\"O argument, typed as
.\"O .IR "unsigned int" .
.\"O In glibc 2.3.3, the
.\"O .I cpusetsize
.\"O argument was removed, but was then restored in glibc 2.3.4, with type
.\"O .IR size_t .
¤³¤ì¤é¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Î¥é¥Ã¥Ñ¡¼´Ø¿ô¤Ï glibc 2.3 ¤ÇƳÆþ¤µ¤ì¤¿¡£
ºÇ½é¤Ï¡¢glibc ¤Î¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤Ë¤Ï
.I "unsigned int"
·¿¤Î
.I cpusetsize
°ú¤­¿ô¤¬Æþ¤Ã¤Æ¤¤¤¿¡£
glibc 2.3.3 ¤Ç¤Ï
.I cpusetsize
°ú¤­¿ô¤¬ºï½ü¤µ¤ì¤¿¤¬¡¢glibc 2.3.4 ¤Ç
.I size_t
·¿¤ÇÉü³è¤·¤¿¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O These system calls are Linux-specific.
¤³¤ì¤é¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï Linux ¸ÇÍ­¤Ç¤¢¤ë¡£
.\"O .SH "NOTES"
.SH Ãí°Õ
.\"O After a call to
.\"O .BR sched_setaffinity (),
.\"O the set of CPUs on which the process will actually run is
.\"O the intersection of the set specified in the
.\"O .I mask
.\"O argument and the set of CPUs actually present on the system.
.BR sched_setaffinity ()
¤ò¸Æ¤Ó½Ð¤·¤¿¸å¤Ï¡¢¥×¥í¥»¥¹¤¬¼ÂºÝ¤Ë¼Â¹Ô¤µ¤ì¤ë CPU ¤Î½¸¹ç¤Ï¡¢
.I mask
°ú¤­¿ô¤Ç»ØÄꤵ¤ì¤¿½¸¹ç¤È¡¢¥·¥¹¥Æ¥à¾å¤Ë¼ÂºÝ¤Ë¸ºß¤¹¤ë CPU ¤Î½¸¹ç¤Î
¶¦Ä̽¸¹ç (AND) ¤È¤Ê¤ë¡£
.\"O The system may further restrict the set of CPUs on which the process
.\"O runs if the "cpuset" mechanism described in
.\"O .BR cpuset (7)
.\"O is being used.
.\"O These restrictions on the actual set of CPUs on which the process
.\"O will run are silently imposed by the kernel.
"cpuset" µ¡¹½¤¬»ÈÍѤµ¤ì¤Æ¤¤¤ë¾ì¹ç¤Ë¤Ï¡¢¥×¥í¥»¥¹¤¬Æ°ºî¤¹¤ë CPU ½¸¹ç
¤ËÂФ·¤Æ¥·¥¹¥Æ¥à¤Ï¤µ¤é¤ËÀ©¸Â¤ò²Ã¤¨¤ë¤«¤â¤·¤ì¤Ê¤¤
("cpuset" µ¡¹½¤Ë¤Ä¤¤¤Æ¤Ï
.BR cpuset (7)
¤ò»²¾È)¡£
¥×¥í¥»¥¹¤¬Æ°ºî¤¹¤ë¼ÂºÝ¤Î CPU ½¸¹ç¤ËÂФ¹¤ëÀ©¸Â¤Ï¥«¡¼¥Í¥ë¤Ë¤è¤ê
°ÅÌۤΤ¦¤Á¤ËŬÍѤµ¤ì¤ë¡£

.\"O .BR sched_setscheduler (2)
.\"O has a description of the Linux scheduling scheme.
.BR sched_setscheduler (2)
¤Ë¤Ï Linux ¤Ë¤ª¤±¤ë¥¹¥±¥¸¥å¡¼¥ê¥ó¥°µ¡¹½¤Ë¤Ä¤¤¤Æ¤ÎÀâÌÀ¤¬¤¢¤ë¡£
.PP
.\"O The affinity mask is actually a per-thread attribute that can be
.\"O adjusted independently for each of the threads in a thread group.
.\"O The value returned from a call to
.\"O .BR gettid (2)
.\"O can be passed in the argument
.\"O .IR pid .
¼ÂºÝ¤Ë¤Ï affinity ¥Þ¥¹¥¯¤Ï¥¹¥ì¥Ã¥Éñ°Ì¤Î°À­¤Ç¡¢¥¹¥ì¥Ã¥É¥°¥ë¡¼¥×¤Î
³Æ¥¹¥ì¥Ã¥Éñ°Ì¤ËÆÈΩ¤·¤ÆÄ´À°¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
.BR gettid (2)
¥³¡¼¥ë¤«¤é¤ÎÊÖ¤êÃͤò¤³¤Î¥³¡¼¥ë¤Î
.I pid
°ú¤­¿ô¤È¤·¤ÆÅϤ¹¤³¤È¤¬¤Ç¤­¤ë¡£
.\"O Specifying
.\"O .I pid
.\"O as 0 will set the attribute for the calling thread,
.\"O and passing the value returned from a call to
.\"O .BR getpid (2)
.\"O will set the attribute for the main thread of the thread group.
.\"O (If you are using the POSIX threads API, then use
.\"O .BR pthread_setaffinity_np (3)
.\"O instead of
.\"O .BR sched_setaffinity ().)
.I pid
¤Ë 0 ¤ò»ØÄꤹ¤ë¤È¸Æ¤Ó½Ð¤·¸µ¤Î¥¹¥ì¥Ã¥É¤Î°À­¤¬ÀßÄꤵ¤ì¡¢
.BR getpid (2)
¥³¡¼¥ë¤«¤é¤ÎÊÖ¤êÃͤò
.I pid
¤Ë»ØÄꤹ¤ë¤È¥¹¥ì¥Ã¥É¥°¥ë¡¼¥×¤Î¥á¥¤¥ó¥¹¥ì¥Ã¥É¤Î°À­¤¬ÀßÄꤵ¤ì¤ë
(POSIX ¥¹¥ì¥Ã¥É API ¤ò»ÈÍѤ·¤Æ¤¤¤ë¾ì¹ç¡¢
.BR sched_setaffinity ()
¤ÎÂå¤ï¤ê¤Ë
.BR pthread_setaffinity_np (3)
¤ò»ÈÍѤ¹¤ë¤³¤È)¡£

.\"O A child created via
.\"O .BR fork (2)
.\"O inherits its parent's CPU affinity mask.
.\"O The affinity mask is preserved across an
.\"O .BR execve (2).
.BR fork (2)
·Ðͳ¤ÇÀ¸À®¤µ¤ì¤¿»Ò¥×¥í¥»¥¹¤Ï¿Æ¥×¥í¥»¥¹¤Î CPU affinity ¥Þ¥¹¥¯¤ò·Ñ¾µ¤¹¤ë¡£
affinity ¥Þ¥¹¥¯¤Ï
.BR execve (2)
¤ÎÁ°¸å¤ÇÊݸ¤µ¤ì¤ë¡£

.\"O This manual page describes the glibc interface for the CPU affinity calls.
.\"O The actual system call interface is slightly different, with the
.\"O .I mask
.\"O being typed as
.\"O .IR "unsigned long *" ,
.\"O reflecting the fact that the underlying implementation of CPU
.\"O sets is a simple bit mask.
.\"O On success, the raw
.\"O .BR sched_getaffinity ()
.\"O system call returns the size (in bytes) of the
.\"O .I cpumask_t
.\"O data type that is used internally by the kernel to
.\"O represent the CPU set bit mask.
¤³¤Î¥Þ¥Ë¥å¥¢¥ë¥Ú¡¼¥¸¤Ç¤Ï CPU affinity ¥³¡¼¥ë¤Î glibc ¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤ò
ÀâÌÀ¤·¤Æ¤¤¤ë¡£¼ÂºÝ¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¡¦¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤Ï¾¯¤·°ã¤Ã¤Æ¤ª¤ê¡¢
¼ÂºÝ¤Î¼ÂÁõ¤Ç¤Ï CPU ½¸¹ç¤Ï´Êñ¤Ê¥Ó¥Ã¥È¥Þ¥¹¥¯¤Ç¤¢¤ë¤È¤¤¤¦¼Â¾õ¤òÈ¿±Ç¤·¡¢
.I mask
¤Î·¿¤¬
.IR "unsigned long *"
¤È¤Ê¤Ã¤Æ¤¤¤ë¡£
À®¸ù»þ¤Ë¤Ï¡¢À¸¤Î
.BR sched_getaffinity ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¼«¿È¤Ï
.I cpumask_t
¥Ç¡¼¥¿·¿¤Î (¥Ð¥¤¥Èñ°Ì¤Î) Â礭¤µ¤òÊÖ¤¹¡£
.I cpumask_t
¤Ï¥«¡¼¥Í¥ëÆâÉô¤Ç CPU ½¸¹ç¤Î¥Ó¥Ã¥È¥Þ¥¹¥¯¤òɽ¸½¤¹¤ë¤Î¤Ë
»È¤ï¤ì¤Æ¤¤¤ë¥Ç¡¼¥¿·¿¤Ç¤¢¤ë¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR clone (2),
.BR getcpu (2),
.BR getpriority (2),
.BR gettid (2),
.BR nice (2),
.BR sched_get_priority_max (2),
.BR sched_get_priority_min (2),
.BR sched_getscheduler (2),
.BR sched_setscheduler (2),
.BR setpriority (2),
.BR pthread_setaffinity_np (3),
.BR CPU_SET (3),
.BR sched_getcpu (3),
.BR capabilities (7),
.BR cpuset (7)