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MLOCK

Section: Linux Programmer's Manual (2)
Updated: 1995-11-26
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mlock - ¥á¥â¥ê¤Î°ìÉô¤Î¥Ú¡¼¥¸¥ó¥°¤ò¶Ø»ß¤¹¤ë  

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#include <sys/mman.h>

int mlock(const void *addr, size_t len);
 

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mlock ¤Ï addr ¤«¤é»Ï¤Þ¤ëŤµ len ¥Ð¥¤¥È¤ÎÈϰϤΥá¥â¥ê¤Î¥Ú¡¼¥¸¥ó¥°(paging)¤ò¶Ø»ß¤¹¤ë¡£ mlock ¥·¥¹¥Æ¥à¡¦¥³¡¼¥ë¤¬À®¸ù¤·¤¿¾ì¹ç¤Ë¤Ï»ØÄꤵ¤ì¤¿ÈϰϤˤ¢¤ë¥á¥â¥ê¤Ï RAM ¤Ë »Ä¤ê³¤±¤ë¤³¤È¤¬Êݾڤµ¤ì¤ë¡¢¤½¤·¤Æ munlock ¤ä munlockall ¤Ë¤è¤Ã¤Æ¥Ú¡¼¥¸¤¬¥¢¥ó¥í¥Ã¥¯¤µ¤ì¤¿¤ê¡¢¥×¥í¥»¥¹¤¬½ªÎ»¤·¤¿¤ê¡¢ exec ¤Ë¤è¤Ã¤ÆÂ¾¤Î¥×¥í¥°¥é¥à¤ò³«»Ï¤·¤¿¤ê¤¹¤ë¤Þ¤Ç¤Ï RAM ¤Ë»Ä¤ë¡£ fork ¤ò¹Ô¤Ê¤Ã¤¿¾ì¹ç¤Ë»Ò¥×¥í¥»¥¹¤Ï¥Ú¡¼¥¸¤Î¥í¥Ã¥¯¤ò·Ñ¾µ¤·¤Ê¤¤¡£

¥á¥â¥ê¤Î¥í¥Ã¥¯¤Ë¤Ï¼ç¤ËÆó¤Ä¤Î»È¤¤Æ»¤¬¤¢¤ë¡£¥ê¥¢¥ë¡¦¥¿¥¤¥à(real-time) ¥¢¥ë¥´¥ê¥º¥à¤È¹â¤¤¥»¥­¥å¥ê¥Æ¥£¤ÎɬÍפʥǡ¼¥¿½èÍý¤Ç¤¢¤ë¡£¥ê¥¢¥ë¡¦¥¿¥¤¥à¤Î ¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ï·èÄêŪ¤Ê¥¿¥¤¥ß¥ó¥°¤ä¥¹¥±¥¸¥å¡¼¥ê¥ó¥°¤òÍ׵ᤷ¡¢ ¥Ú¡¼¥¸¥ó¥°¤Ïͽ´ü¤·¤Ê¤¤¥×¥í¥°¥é¥à¤Î¼Â¹ÔÃÙ¤ì¤ò¤â¤¿¤é¤¹¼çÍפÊÍ×°ø¤Ç¤¢¤ë¡£ ¥ê¥¢¥ë¡¦¥¿¥¤¥à¤Î¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ï¤¿¤¤¤Æ¤¤¤Ï sched_setscheduler ¤Ç¥ê¥¢¥ë¡¦¥¿¥¤¥à¡¦¥¹¥±¥¸¥å¥é¡¼¤ËÊѹ¹¤µ¤ì¤ë¡£ °Å¹æ¤ä¥»¥­¥å¥ê¥Æ¥£¤Î¥½¥Õ¥È¥¦¥§¥¢¤Ï¤·¤Ð¤·¤Ð¥Ñ¥¹¥ï¡¼¥É¤äÈëÌ©¸°¤Î¥Ç¡¼¥¿¤Î ¤Î¤è¤¦¤Ê½ÅÍפʥǡ¼¥¿¤ò°·¤¦¡£¥Ú¡¼¥¸¥ó¥°¤Î·ë²Ì¡¢¤³¤ì¤é¤ÎÈëÌ©¤¬ ¥¹¥ï¥Ã¥×ÍѤθÇÄêÇÞÂΤËžÁ÷¤µ¤ì¤ë¤«¤â¤·¤ì¤Ê¤¤¡£¤½¤·¤Æ¤½¤ì¤Ï¥»¥­¥å¥ê¥Æ¥£ ¡¦¥½¥Õ¥È¥¦¥§¥¢¤¬ RAM ¾å¤ÎÈëÌ©¤òºï½ü¤·¤Æ½ªÎ»¤·¤¿¤º¤Ã¤È¸å¤Ë¤Ç¤âŨ¤Ë¤è¤Ã¤Æ ¥¢¥¯¥»¥¹¤¬²Äǽ¤Ë¤Ê¤ë¤«¤â¤·¤ì¤Ê¤¤¡£

¥á¥â¥ê¤Î¥í¥Ã¥¯(lock)¤ÏÎßÀѤ·¤Ê¤¤¡£Î㤨¤ÐÊ£¿ô²ó mlock ¤ä mlockall ¤ò¸Æ¤Ó½Ð¤·¤Æ¥í¥Ã¥¯¤µ¤ì¤¿¥Ú¡¼¥¸¤â°ì²ó¤ÎÂбþ¤¹¤ëÈϰϤΠmunlock ¤Î¸Æ¤Ó½Ð¤·¤ä munlockall ¤Ë¤è¤Ã¤Æ¥¢¥ó¥í¥Ã¥¯(unlock)¤µ¤ì¤ë¡£ Ê£¿ô¤Î¾ì½ê¤äÊ£¿ô¤Î¥×¥í¥»¥¹¤Ë¥Þ¥Ã¥×¤µ¤ì¤Æ¤¤¤ë¥Ú¡¼¥¸¤Ï¡¢¾¯¤Ê¤¯¤È¤â°ì¤Ä¤Î¾ì½ê¡¢ °ì¤Ä¤Î¥×¥í¥»¥¹¤Ç¥í¥Ã¥¯¤µ¤ì¤Æ¤¤¤ë¸Â¤ê¤Ï RAM ¤Ë»Ä¤ê³¤±¤ë¡£

mlock ¤È munlock ¤¬»ÈÍѲÄǽ¤Ç¤¢¤ë POSIX ¥·¥¹¥Æ¥à¤Ç¤Ï _POSIX_MEMLOCK_RANGE ¤¬ <unistd.h> ¤ËÄêµÁ¤µ¤ì¤Æ¤ª¤ê¡¢<limits.h> ¤Ë¤¢¤ë PAGESIZE ¤ÎÃͤϥڡ¼¥¸Åö¤ê¤Î¥Ð¥¤¥È¿ô¤ò¼¨¤·¤Æ¤¤¤ë¡£  

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À®¸ù¤·¤¿¾ì¹ç¤Ï¡¢ mlock ¤Ï¥¼¥í¤òÊÖ¤¹¡£¥¨¥é¡¼¤Î¾ì¹ç¤Ï -1 ¤¬ÊÖ¤µ¤ì¡¢ errno ¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¡¢¥×¥í¥»¥¹¤Î¥¢¥É¥ì¥¹¶õ´Ö¤Ë¤ª¤±¤ë¥í¥Ã¥¯¤ÏÊѹ¹¤µ¤ì¤Ê¤¤¡£  

¥¨¥é¡¼

ENOMEM
»ØÄꤵ¤ì¤¿¥¢¥É¥ì¥¹ÈϰϤ¬¥×¥í¥»¥¹¤Î¥¢¥É¥ì¥¹¶õ´Ö¤Ë¥Þ¥Ã¥×¤µ¤ì¤¿¥Ú¡¼¥¸¤È °ìÃפ·¤Ê¤¤¤«¡¢µö¤µ¤ì¤ë¾å¸Â¤òͤ¨¤ë¿ô¤Î¥Ú¡¼¥¸¤ò¥í¥Ã¥¯¤·¤è¤¦¤È¤·¤¿
EPERM
¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤¬É¬Í×¤ÊÆÃ¸¢¤ò½êÍ­¤·¤Æ¤¤¤Ê¤«¤Ã¤¿¡£ ¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¤Î¥×¥í¥»¥¹¤Î¤ß¤¬ ¥Ú¡¼¥¸¤ò¥í¥Ã¥¯¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
EINVAL
len ¤¬Àµ¤Î¿ô¤Ç¤Ê¤¤¡£

 

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POSIX.1b, SVr4. SVr4 ¤Ë¤Ï¾¤Ë EAGAIN ¥¨¥é¡¼¤Ë¤Ä¤¤¤Æ¤Îµ­½Ò¤¬¤¢¤ë¡£  

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munlock(2), mlockall(2), munlockall(2)


 

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