Linux Certif

Toute la documentation sur la certification Linux LPI

semop

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semop, semtimedop - ¥»¥Þ¥Õ¥©¤ÎÁàºî

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#include <sys/types.h>

#include <sys/ipc.h>

#include <sys/sem.h>



int semop(int semid, struct sembuf *sops, unsigned nsops);



int semtimedop(int semid, struct sembuf *sops, unsigned nsops,

               struct timespec *timeout);

ÀâÌÀ

¥»¥Þ¥Õ¥©½¸¹ç (semaphore set) ¤Î¥á¥ó¥Ð¡¼¤Î³Æ¥»¥Þ¥Õ¥©¤Ï °Ê²¼¤Î´ØÏ¢¾ðÊó¤ò»ý¤Ã¤Æ¤¤¤ë:

unsigned short  semval;   /* ¥»¥Þ¥Õ¥©ÃÍ */

unsigned short  semzcnt;  /* ¥¼¥í¤òÂÔ¤Ä¥×¥í¥»¥¹¿ô */

unsigned short  semncnt;  /* Áý²Ã¤òÂÔ¤Ä¥×¥í¥»¥¹¿ô */

pid_t           sempid;   /* ºÇ¸å¤ËÁàºî¤ò¹Ô¤Ê¤Ã¤¿¥×¥í¥»¥¹ */

semop() ¤Ï semid ¤Ç»ØÄꤵ¤ì¤¿¥»¥Þ¥Õ¥©½¸¹ç¤ÎÁªÂò¤µ¤ì¤¿¥»¥Þ¥Õ¥©¤ËÂФ·¤ÆÁàºî¤ò¹Ô¤¦¡£ sops ¤Ï nsops ¸Ä¤ÎÍ×ÁǤÎÇÛÎó¤ò»Ø¤·¡¢ÇÛÎó¤Î³ÆÍ×ÁǤϸġ¹¤Î¥»¥Þ¥Õ¥©¤Ë ÂФ¹¤ëÁàºî¤ò¼¨¤¹¡£¤½¤Î·¿¤Ï struct sembuf ¤Ç¡¢¼¡¤Î¥á¥ó¥Ð¤ò»ý¤Ä:

unsigned short sem_num;  /* ¥»¥Þ¥Õ¥©ÈÖ¹æ */

short          sem_op;   /* ¥»¥Þ¥Õ¥©Áàºî */

short          sem_flg;  /* Áàºî¥Õ¥é¥° */

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¥¨¥é¡¼

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E2BIG

nsops °ú¤­¿ô¤¬ SEMOPM ¤è¤êÂ礭¤¤¡£ SEMOPM ¤Ï°ì²ó¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Çµö¤µ¤ì¤ëÁàºî¤ÎºÇÂç¸Ä¿ô¤Ç¤¢¤ë¡£

EACCES

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EAGAIN

Áàºî¤òľ¤Á¤Ë½èÍý¤¹¤ë¤³¤È¤¬¤Ç¤­¤º¡¢¤«¤Ä sem_flg ¤Ë IPC_NOWAIT ¤¬»ØÄꤵ¤ì¤Æ¤¤¤ë¤« timeout ¤Ç»ØÄꤵ¤ì¤¿À©¸Â»þ´Ö¤¬·Ð²á¤·¤¿¡£

EFAULT

sops ¤Þ¤¿¤Ï timeout ¤¬»Ø¤·¤Æ¤¤¤ë¥¢¥É¥ì¥¹¤Ë¥¢¥¯¥»¥¹¤Ç¤­¤Ê¤¤¡£

EFBIG

¤¢¤ëÁàºî¤Ç¡¢ sem_num ¤ÎÃͤ¬ 0 ̤Ëþ¤«¡¢½¸¹çÆâ¤Î¥»¥Þ¥Õ¥©¤Î¿ô°Ê¾å¤Ç¤¢¤ë¡£

EIDRM

¥»¥Þ¥Õ¥©½¸¹ç¤¬ºï½ü¤µ¤ì¤¿¡£

EINTR

¤³¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤ÇÄä»ß¤·¤Æ¤¤¤ë»þ¤Ë¥×¥í¥»¥¹¤¬¥·¥°¥Ê¥ë¤òÊá³Í¤·¤¿¡£

EINVAL

¥»¥Þ¥Õ¥©½¸¹ç¤¬Â¸ºß¤·¤Ê¤¤¤«¡¢ semid ¤¬ 0 ̤Ëþ¤Ç¤¢¤ë¤«¡¢ nsops ¤¬Àµ¤Î¿ô¤Ç¤Ê¤¤¡£

ENOMEM

¤¢¤ëÁàºî¤Ç sem_flg ¤Ë SEM_UNDO ¤¬»ØÄꤵ¤ì¤¿¤¬¡¢¥·¥¹¥Æ¥à¤Ë¥¢¥ó¥É¥¥¹½Â¤ÂΤ˳ä¤êÅö¤Æ¤ë½½Ê¬¤Ê¥á¥â¥ê¤¬¤Ê¤¤¡£

ERANGE

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SVr4, POSIX.1-2001.

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semadj ¤Ï¥×¥í¥»¥¹¤´¤È¤ÎÀ°¿ô¤Ç¡¢ SEM_UNDO ¥Õ¥é¥°¤òÀßÄꤷ¤Æ¼Â¹Ô¤µ¤ì¤¿Á´¤Æ¤Î¥»¥Þ¥Õ¥©Áàºî¤Î(Éé¿ô¤Î)¥«¥¦¥ó¥¿¤Ç¤¢¤ë¡£ semctl(2) ¤Ë SETVAL ¤Þ¤¿¤Ï SETALL ¤ò»ØÄꤷ¡¢¥»¥Þ¥Õ¥©¤ÎÃͤ¬ ľÀÜÀßÄꤵ¤ì¤¿¾ì¹ç¤Ë¤Ï¡¢Á´¤Æ¤Î¥×¥í¥»¥¹¤Ë¤ª¤¤¤ÆÂбþ¤¹¤ë semadj ¤ÎÃͤ¬¥¯¥ê¥¢¤µ¤ì¤ë¡£

¤¢¤ë¥»¥Þ¥Õ¥©¤Î semval, sempid, semzcnt, semnct ¤ÎÃͤϤ¤¤º¤ì¤â¡¢Å¬ÀÚ¤ÊÁàºî¤ò»ØÄꤷ¤Æ semctl(2) ¤ò¸Æ¤Ó½Ð¤¹¤³¤È¤Ç¼èÆÀ¤Ç¤­¤ë¡£

¥»¥Þ¥Õ¥©½¸¹ç¤Î¥ê¥½¡¼¥¹¤Ë´Ø¤¹¤ëÀ©¸Â¤Î¤¦¤Á¡¢ semop() ¤Ë±Æ¶Á¤òµÚ¤Ü¤¹¤â¤Î¤ò°Ê²¼¤Ëµó¤²¤ë:

SEMOPM

°ì²ó¤Î semop() ¤Çµö¤µ¤ì¤ëÁàºî¤ÎºÇÂç¿ô (32)¡£ (Linux ¤Ç¤Ï¡¢¤³¤ÎÀ©¸ÂÃÍ¤Ï /proc/sys/kernel/sem ¤ÎÂè3¥Õ¥£¡¼¥ë¥É¤ËÂбþ¤·¡¢Æɤ߽Ф·¤âÊѹ¹¤â¤Ç¤­¤ë)¡£

SEMVMX

semval ¤¬¼è¤êÆÀ¤ëºÇÂçÃÍ: ¼ÂÁõ°Í¸ (32767)¡£

°Ê²¼¤ÎÃͤ˴ؤ·¤Æ¤Ï¼ÂÁõ°Í¸¤ÎÀ©¸Â¤Ï¤Ê¤¤¡£ ½ªÎ»»þ¤ÎÄ´À° (adjust on exit) ¤ÎºÇÂçÃÍ (SEMAEM)¡¢ ¥·¥¹¥Æ¥àÁ´ÂΤΥ¢¥ó¥É¥¥¹½Â¤ÂΤκÇÂç¿ô (SEMMNU)¡¢ ¥×¥í¥»¥¹¤¢¤¿¤ê¤Î¥¢¥ó¥É¥¥¹½Â¤ÂΤκÇÂç¿ô¡£

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semctl(2), semget(2), sigaction(2), capabilities(7), sem_overview(7), svipc(7)