sched_setparam

Autres langues

Langue: ja

Version: 2006-03-23 (openSuse - 09/10/07)

Section: 2 (Appels système)

̾Á°

sched_setparam, sched_getparam - ¥¹¥±¥¸¥å¡¼¥ê¥ó¥°¡¦¥Ñ¥é¥á¡¼¥¿¤ÎÀßÄê¤È¼èÆÀ¤ò¹Ô¤Ê¤¦

½ñ¼°


#include <sched.h>



int sched_setparam(pid_t pid, const struct sched_param *param);



int sched_getparam(pid_t pid, struct sched_param *param);





struct sched_param {

    ...

    int sched_priority;

    ...

};


ÀâÌÀ

sched_setparam() ¤Ï pid ¤Ç»ØÄꤵ¤ì¤¿¥×¥í¥»¥¹¤Î¥¹¥±¥¸¥å¡¼¥ê¥ó¥°Êý¿Ë (scheduling policy) ¤Ë ´ØÏ¢¤¹¤ë¥¹¥±¥¸¥å¡¼¥ê¥ó¥°¡¦¥Ñ¥é¥á¡¼¥¿¤òÀßÄꤹ¤ë¡£ pid ¤¬ 0 ¤Ê¤é¤Ð¡¢¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤Î¥Ñ¥é¥á¡¼¥¿¤¬ÀßÄꤵ¤ì¤ë¡£ ¥Ñ¥é¥á¡¼¥¿ param ¤Î²ò¼á¤Ï¡¢ pid ¤Ç»ØÄꤵ¤ì¤¿¥×¥í¥»¥¹¤Î¥¹¥±¥¸¥å¡¼¥ê¥ó¥°Êý¿Ë¤Ë¤è¤Ã¤Æ°Û¤Ê¤ë¡£ Linux ¤Ç¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë¥¹¥±¥¸¥å¡¼¥ê¥ó¥°Êý¿Ë¤ÎÀâÌÀ¤Ï sched_setscheduler(2) ¤ò»²¾È¤Î¤³¤È¡£

sched_getparam() ¤Ï pid ¤Ç»ØÄꤵ¤ì¤¿¥×¥í¥»¥¹¤Î¥¹¥±¥¸¥å¡¼¥ê¥ó¥°¡¦¥Ñ¥é¥á¡¼¥¿¤ò¼èÆÀ¤¹¤ë¡£ pid ¤¬ 0 ¤Ê¤é¤Ð¡¢¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤Î¥Ñ¥é¥á¡¼¥¿¤ò¼èÆÀ¤¹¤ë¡£

sched_setparam() ¤Ï¥×¥í¥»¥¹¤Î¥¹¥±¥¸¥å¡¼¥ê¥ó¥°Êý¿Ë¤Ë¤ª¤±¤ë param ¤ÎÂÅÅöÀ­¤ò¥Á¥§¥Ã¥¯¤¹¤ë¡£ ¥Ñ¥é¥á¡¼¥¿ param->sched_priority ¤Ï sched_get_priority_min(2) ¤È sched_get_priority_max(2) ¤ÎÈϰϤËÆþ¤Ã¤Æ¤¤¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

¥¹¥±¥¸¥å¡¼¥ê¥ó¥°¤ÎÍ¥ÀèÅÙ¤ÈÊý¿Ë¤Ë´ØÏ¢¤¹¤ëÆø¢¤È¥ê¥½¡¼¥¹À©¸Â¤Î µÄÏÀ¤Ë´Ø¤·¤Æ¤Ï sched_setscheduler(2) ¤ò»²¾È¤Î¤³¤È¡£

sched_setparam() ¤È sched_getparam() ¤¬»ÈÍѤǤ­¤ë POSIX ¥·¥¹¥Æ¥à¤Ç¤Ï¡¢ <unistd.h> ¤Ë _POSIX_PRIORITY_SCHEDULING ¤¬ÄêµÁ¤µ¤ì¤Æ¤¤¤ë¡£

ÊÖ¤êÃÍ

À®¸ù¤·¤¿¾ì¹ç¤Ï sched_setparam() ¤È sched_getparam() ¤Ï 0 ¤òÊÖ¤¹¡£ ¥¨¥é¡¼¤Î¾ì¹ç¤Ï -1 ¤¬ÊÖ¤µ¤ì¡¢ errno ¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë¡£

¥¨¥é¡¼

EINVAL
¥Ñ¥é¥á¡¼¥¿ param ¤¬¸½ºß¤Î¥¹¥±¥¸¥å¡¼¥ê¥ó¥°Êý¿Ë¤Ë¤ª¤¤¤Æ¤Ï ̵°ÕÌ£¤Ç¤¢¤ë¡£
EPERM
¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤¬Å¬ÀÚ¤ÊÆø¢¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤ (Linux ¤Ç¤Ï¡¢ CAP_SYS_NICE ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤)¡£
ESRCH
pid ¤ò ID ¤Ë»ý¤Ä¥×¥í¥»¥¹¤¬¸«¤Ä¤«¤é¤Ê¤«¤Ã¤¿¡£

½àµò

POSIX.1-2001.

´ØÏ¢¹àÌÜ

getpriority(2), nice(2), sched_get_priority_max(2), sched_get_priority_min(2), sched_getaffinity(2), sched_getscheduler(2), sched_setaffinity(2), sched_setscheduler(2), setpriority(2), capabilities(7)

Programming for the real world - POSIX.4 by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0