1 .\" Copyright 1993 Giorgio Ciucci (giorgio@crcc.it)
3 .\" Permission is granted to make and distribute verbatim copies of this
4 .\" manual provided the copyright notice and this permission notice are
5 .\" preserved on all copies.
7 .\" Permission is granted to copy and distribute modified versions of this
8 .\" manual under the conditions for verbatim copying, provided that the
9 .\" entire resulting derived work is distributed under the terms of a
10 .\" permission notice identical to this one.
12 .\" Since the Linux kernel and libraries are constantly changing, this
13 .\" manual page may be incorrect or out-of-date. The author(s) assume no
14 .\" responsibility for errors or omissions, or for damages resulting from
15 .\" the use of the information contained herein. The author(s) may not
16 .\" have taken the same level of care in the production of this manual,
17 .\" which is licensed free of charge, as they might when working
20 .\" Formatted or processed versions of this manual, if unaccompanied by
21 .\" the source, must acknowledge the copyright and authors of this work.
23 .\" Modified 1996-10-22, Eric S. Raymond <esr@thyrsus.com>
24 .\" Modified 2002-01-08, Michael Kerrisk <mtk.manpages@gmail.com>
25 .\" Modified 2003-04-28, Ernie Petrides <petrides@redhat.com>
26 .\" Modified 2004-05-27, Michael Kerrisk <mtk.manpages@gmail.com>
27 .\" Modified, 11 Nov 2004, Michael Kerrisk <mtk.manpages@gmail.com>
28 .\" Language and formatting clean-ups
29 .\" Added notes on /proc files
30 .\" 2005-04-08, mtk, Noted kernel version numbers for semtimedop()
31 .\" 2007-07-09, mtk, Added an EXAMPLE code segment.
33 .\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
34 .\" all rights reserved.
35 .\" Translated 1997-02-23, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
36 .\" Updated 2003-02-09, Kentaro Shirakata <argrath@ub32.org>
37 .\" Updated 2003-09-12, Kentaro Shirakata <argrath@ub32.org>
38 .\" Updated 2005-03-01, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
39 .\" Updated 2005-04-17, Akihiro MOTOKI
40 .\" Updated 2005-09-06, Akihiro MOTOKI
41 .\" Updated 2007-05-01, Akihiro MOTOKI, LDP v2.46
43 .\"WORD: semaphore ¥»¥Þ¥Õ¥©
44 .\"WORD: member ¥á¥ó¥Ð¡¼
45 .\"WORD: process ¥×¥í¥»¥¹
46 .\"WORD: system call ¥·¥¹¥Æ¥à¥³¡¼¥ë
47 .\"WORD: undo ¥¢¥ó¥É¥¥
48 .\"WORD: signal ¥·¥°¥Ê¥ë
49 .\"WORD: catch Êá³Í(catch)
50 .\"WORD: process-ID ¥×¥í¥»¥¹ID
52 .\"WORD: implement ¼ÂÁõ
54 .\"WORD: free ²òÊü(free).
55 .\"WORD: memory ¥á¥â¥ê
56 .\"WORD: anonymous structure ̵̾¹½Â¤ÂÎ
57 .\"WORD: time limit À©¸Â»þ´Ö
59 .TH SEMOP 2 2008-10-04 "Linux" "Linux Programmer's Manual"
61 semop, semtimedop \- ¥»¥Þ¥Õ¥©¤ÎÁàºî
64 .B #include <sys/types.h>
65 .B #include <sys/ipc.h>
66 .B #include <sys/sem.h>
68 .BI "int semop(int " semid ", struct sembuf *" sops ", unsigned " nsops );
70 .BI "int semtimedop(int " semid ", struct sembuf *" sops ", unsigned " nsops ,
71 .BI " struct timespec *" timeout );
75 glibc ¸þ¤±¤Îµ¡Ç½¸¡ºº¥Þ¥¯¥í¤ÎÍ×·ï
76 .RB ( feature_test_macros (7)
83 ¥»¥Þ¥Õ¥©½¸¹ç (semaphore set) ¤Î¥á¥ó¥Ð¡¼¤Î³Æ¥»¥Þ¥Õ¥©¤Ï
84 °Ê²¼¤Î´ØÏ¢¾ðÊó¤ò»ý¤Ã¤Æ¤¤¤ë:
88 unsigned short semval; /* ¥»¥Þ¥Õ¥©ÃÍ */
89 unsigned short semzcnt; /* ¥¼¥í¤òÂÔ¤Ä¥×¥í¥»¥¹¿ô */
90 unsigned short semncnt; /* Áý²Ã¤òÂÔ¤Ä¥×¥í¥»¥¹¿ô */
91 pid_t sempid; /* ºÇ¸å¤ËÁàºî¤ò¹Ô¤Ê¤Ã¤¿¥×¥í¥»¥¹ */
98 ¤Ç»ØÄꤵ¤ì¤¿¥»¥Þ¥Õ¥©½¸¹ç¤ÎÁªÂò¤µ¤ì¤¿¥»¥Þ¥Õ¥©¤ËÂФ·¤ÆÁàºî¤ò¹Ô¤¦¡£
102 ¸Ä¤ÎÍ×ÁǤÎÇÛÎó¤ò»Ø¤·¡¢ÇÛÎó¤Î³ÆÍ×ÁǤϸġ¹¤Î¥»¥Þ¥Õ¥©¤Ë
103 ÂФ¹¤ëÁàºî¤ò¼¨¤¹¡£¤½¤Î·¿¤Ï
105 ¤Ç¡¢¼¡¤Î¥á¥ó¥Ð¤ò»ý¤Ä:
109 unsigned short sem_num; /* ¥»¥Þ¥Õ¥©ÈÖ¹æ */
110 short sem_op; /* ¥»¥Þ¥Õ¥©Áàºî */
111 short sem_flg; /* Áàºî¥Õ¥é¥° */
122 ¤¬»ØÄꤵ¤ì¤¿Áàºî¤Ï¡¢¤½¤Î¥×¥í¥»¥¹¤¬½ªÎ»¤·¤¿»þ¤Ë¼«Æ°Åª¤Ë¼è¤ê¾Ã¤µ¤ì¤ë¡£
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462 ¤¢¤ë¥»¥Þ¥Õ¥©¤Î \fIsemval\fP, \fIsempid\fP, \fIsemzcnt\fP, \fIsemnct\fP
463 ¤ÎÃͤϤ¤¤º¤ì¤â¡¢Å¬ÀÚ¤ÊÁàºî¤ò»ØÄꤷ¤Æ
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476 .I /proc/sys/kernel/sem
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514 .\" http://marc.theaimsgroup.com/?l=linux-kernel&m=110260821123863&w=2
516 .\" http://marc.theaimsgroup.com/?l=linux-kernel&m=110261701025794&w=2
518 °Ê²¼¤ÎÉôʬŪ¤Ê¥³¡¼¥É¤Ï¡¢
519 ¥»¥Þ¥Õ¥© 0 ¤ÎÃͤ¬ 0 ¤Ë¤Ê¤ë¤Î¤òÂԤäƤ«¤é¡¢
520 ¥»¥Þ¥Õ¥©¤ÎÃͤò 1 ²Ã»»¤¹¤ë½èÍý¤ò¡¢
522 ¤ò»È¤Ã¤Æ¥¢¥È¥ß¥Ã¥¯ (atomically) ¤Ë¹Ô¤¦¡£
525 struct sembuf sops[2];
528 /* Code to set \fIsemid\fP omitted */
530 sops[0].sem_num = 0; /* Operate on semaphore 0 */
531 sops[0].sem_op = 0; /* Wait for value to equal 0 */
534 sops[1].sem_num = 0; /* Operate on semaphore 0 */
535 sops[1].sem_op = 1; /* Increment value by one */
538 if (semop(semid, sops, 2) == \-1) {
547 .BR capabilities (7),
548 .BR sem_overview (7),