1 .\" Hey Emacs! This file is -*- nroff -*- source.
3 .\" Copyright (C) Markus Kuhn, 1996
4 .\" and Copyright (C) Linux Foundation, 2008, written by Michael Kerrisk
5 .\" <mtk.manpages@gmail.com>
7 .\" This is free documentation; you can redistribute it and/or
8 .\" modify it under the terms of the GNU General Public License as
9 .\" published by the Free Software Foundation; either version 2 of
10 .\" the License, or (at your option) any later version.
12 .\" The GNU General Public License's references to "object code"
13 .\" and "executables" are to be interpreted as the output of any
14 .\" document formatting or typesetting system, including
15 .\" intermediate and printed output.
17 .\" This manual is distributed in the hope that it will be useful,
18 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
19 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 .\" GNU General Public License for more details.
22 .\" You should have received a copy of the GNU General Public
23 .\" License along with this manual; if not, write to the Free
24 .\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
27 .\" 1996-04-10 Markus Kuhn <mskuhn@cip.informatik.uni-erlangen.de>
28 .\" First version written
29 .\" Modified, 2004-10-24, aeb
31 .\" Minor rewrites of some parts.
32 .\" NOTES: describe case where clock_nanosleep() can be preferable.
33 .\" NOTES: describe CLOCK_REALTIME versus CLOCK_NANOSLEEP
34 .\" Replace crufty discussion of HZ with a pointer to time(7).
36 .\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
37 .\" all rights reserved.
38 .\" Translated 1997-02-23, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
39 .\" Updated 1999-02-27, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
40 .\" Updated 2003-09-15, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
41 .\" Updated 2005-02-10, Akihiro MOTOKI
42 .\" Updated 2006-07-23, Akihiro MOTOKI, LDP v2.36
43 .\" Updated 2006-08-13, Akihiro MOTOKI, LDP v2.39
44 .\" Updated 2008-08-08, Akihiro MOTOKI, LDP v3.05
48 .\"WORD: signal ¥·¥°¥Ê¥ë
50 .\"WORD: block ¶Ø»ß(block)
51 .\"WORD: kernel ¥«¡¼¥Í¥ë
52 .\"WORD: real-time ¥ê¥¢¥ë¡¦¥¿¥¤¥à
53 .\"WORD: schedule ¥¹¥±¥¸¥å¡¼¥ë
54 .\"WORD: busy wait ¥Ó¥·¡¼¡¦¥¦¥§¥¤¥È
56 .TH NANOSLEEP 2 2009-01-19 "Linux" "Linux Programmer's Manual"
58 nanosleep \- ¹âÀºÅ٤ʥ¹¥ê¡¼¥×
62 .BI "int nanosleep(const struct timespec *" req ", struct timespec *" rem );
65 glibc ¸þ¤±¤Îµ¡Ç½¸¡ºº¥Þ¥¯¥í¤ÎÍ×·ï
66 .RB ( feature_test_macros (7)
71 _POSIX_C_SOURCE\ >=\ 199309L
76 ¤Ç»ØÄꤵ¤ì¤¿»þ´Ö¤Î´Ö¡¢¥×¥í¥°¥é¥à¤Î¼Â¹Ô¤òÃٱ䤵¤»¤ë¡£
78 ¤Ï¡¢¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤Î¼Â¹Ô¤ò¡¢
81 ¤Ç»ØÄꤵ¤ì¤¿»þ´Ö¤Î´Ö¡¢¤â¤·¤¯¤Ï¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤Ç¥Ï¥ó¥É¥é¤Îµ¯Æ°¤Î
82 ¤¤Ã¤«¤±¤È¤Ê¤ë¥·¥°¥Ê¥ë¡¢¤Þ¤¿¤Ï¥×¥í¥»¥¹¤ò½ªÎ»¤µ¤»¤ë¥·¥°¥Ê¥ë¤ÎÇÛÁ÷¤¬
83 ¹Ô¤ï¤ì¤ë¤Þ¤Ç°ì»þÄä»ß¤¹¤ë¡£
85 ¸Æ¤Ó½Ð¤·¤¬¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤ê³ä¤ê¹þ¤Þ¤ì¤¿¾ì¹ç¡¢
96 ¤¬»Ø¤¹¹½Â¤ÂΤ˳ÊǼ¤¹¤ë¡£
100 ¤ò¤â¤¦°ìÅٸƤӽФ·¤Æ¡¢»ØÄꤷ¤¿»þ´Ö¤ÎÄä»ß¤ò
101 ´°Î»¤µ¤»¤ë¤³¤È¤¬¤Ç¤¤ë (⤷¡¢¡ÖÃí°Õ¡×¤ÎÀá¤ò»²¾È¤Î¤³¤È)¡£
103 ¥Ê¥ÎÉùï¤ß¤Î»þ´Ö´Ö³Ö¤ò»ØÄꤹ¤ë¤Î¤Ë
105 ¹½Â¤ÂΤ¬»ÈÍѤµ¤ì¤ë¡£¤³¤Î¹½Â¤ÂΤϼ¡¤Î¤è¤¦¤ËÄêµÁ¤µ¤ì¤Æ¤¤¤ë¡£
109 time_t tv_sec; /* ÉÃ */
110 long tv_nsec; /* ¥Ê¥ÎÉà */
115 ¥Ê¥ÎÉäΥե£¡¼¥ë¥É¤ÎÃÍ¤Ï 0 ¤«¤é 999999999 ¤ÎÈϰϤˤʤ±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
122 ¤Ë¤Ï°Ê²¼¤Î¤è¤¦¤ÊÍøÅÀ¤¬¤¢¤ë:
123 Ää»ß´ü´Ö¤Î»ØÄê¤Ë´Ø¤·¤Æ¹â¤¤»þ´Öʬ²òǽ¤¬Ä󶡤µ¤ì¤Æ¤¤¤ë¡£
124 ¥·¥°¥Ê¥ë¤È¸ß¤¤¤Ë±Æ¶Á¤òµÚ¤Ü¤¹¤³¤È¤¬¤Ê¤¤¤È
125 POSIX.1 ¤ÇÌÀ¼¨Åª¤Ëµ¬Äꤵ¤ì¤Æ¤¤¤ë¡£
126 ¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤Ã¤Æ³ä¤ê¹þ¤Þ¤ì¤¿ºÝ¤Ë¡¢Ää»ß¤òºÆ³«¤¹¤ë¤Î¤¬
129 Í׵ᤵ¤ì¤¿´ü´Ö¤ÎÄä»ß¤ËÀ®¸ù¤·¤¿¾ì¹ç¡¢
131 ¤Ï 0 ¤òÊÖ¤¹¡£¸Æ¤Ó½Ð¤·¤¬¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤ê³ä¤ê¹þ¤Þ¤ì¤¿¤ê¡¢
132 ¥¨¥é¡¼¤¬È¯À¸¤·¤¿¾ì¹ç¤Ï¡¢\-1 ¤òÊÖ¤·¡¢
134 ¤Ë¥¨¥é¡¼ÆâÍƤò¼¨¤¹ÃͤòÀßÄꤹ¤ë¡£
138 ¥æ¡¼¥¶¶õ´Ö¤«¤é¤Î¾ðÊó¤Î¥³¥Ô¡¼¤ÇÌäÂ꤬¤¢¤Ã¤¿¡£
141 ¤½¤Î¥¹¥ì¥Ã¥É¤ËÇÛÁ÷¤µ¤ì¤¿¥·¥°¥Ê¥ë¤Ë¤è¤êÄä»ß¤¬ÃæÃǤµ¤ì¤¿¡£
144 ¤òºÆ¤Ó¸Æ¤Ó½Ð¤·¤ÆÄä»ß¤ò³¤±¤ë¤³¤È¤¬¤Ç¤¤ë¤è¤¦¤Ë¡¢
145 »Ä¤ê¤ÎÄä»ß»þ´Ö¤¬ \fI*rem\fP ¤Ë³ÊǼ¤µ¤ì¤ë¡£
149 ¥Õ¥£¡¼¥ë¥É¤ÎÃͤ¬ 0 ¤«¤é 999999999 ¤Þ¤Ç¤ÎÈϰϤˤʤ«¤Ã¤¿¤«¡¢
156 ¤Ç»ØÄꤵ¤ì¤¿´ü´Ö¤¬¡¢ÆâÉô¤Ç»ÈÍѤµ¤ì¤ë¥¯¥í¥Ã¥¯¤ÎγÅÙ¤ÎÇÜ¿ô¤Ë¤Ê¤Ã¤Æ¤¤¤Ê¤¤
157 ¾ì¹ç¡¢´ü´Ö¤Ï°ìÈֶᤤÇÜ¿ô¤ËÀÚ¤ê¾å¤²¤é¤ì¤ë¡£
158 ¤Þ¤¿¡¢Ää»ß¤¬´°Î»¤·¤¿¸å¡¢CPU ¤¬¸Æ¤Ó½Ð¤·¸µ¤Î¥¹¥ì¥Ã¥É¤òºÆ¤Ó¼Â¹Ô¤Ç¤¤ë¤è¤¦¤Ë
159 ¤Ê¤ë¤Þ¤Ç¤Ë¤ÏÃٱ䤬Æþ¤ë¡£
161 ¥·¥°¥Ê¥ë¤Ë¤è¤ë³ä¤ê¹þ¤ß¸å¤Ë·«¤êÊÖ¤·ºÆ³«¤µ¤ì¤¿¾ì¹ç¡¢
163 ¤ÎÄä»ß¤¬ÁêÂÐŪ¤Ê´ü´Ö¤Ç¤¢¤ë¤³¤È¤ÏÌäÂê¤È¤Ê¤ë¤³¤È¤¬¤¢¤ë¡£
164 ¤³¤ì¤Ï¡¢¸Æ¤Ó½Ð¤·¤Î³ä¤ê¹þ¤ß¤«¤éºÆ³«¤Þ¤Ç¤Î´Ö¤Î»þ´Ö¤¬¸¶°ø¤Ç
165 Ää»ß¤¬ºÇ½ªÅª¤Ë´°Î»¤·¤¿ºÝ¤Ë»þ´Ö¤Ë¤º¤ì¤¬È¯À¸¤¹¤ë¤«¤é¤Ç¤¢¤ë¡£
166 ¤³¤ÎÌäÂê¤Ï¡¢ÀäÂлþ¹ï¤¬»ØÄê¤Ç¤¤ë
167 .BR clock_nanosleep (2)
168 ¤ò»È¤¦¤³¤È¤Ç²óÈò¤Ç¤¤ë¡£
174 ¤ËÂФ·¤Æ»þ¹ï¤ò·×¬¤¹¤ë¤Ù¤¤À¤Èµ¬Äꤷ¤Æ¤¤¤ë¡£
175 ¤·¤«¤·¤Ê¤¬¤é¡¢Linux ¤Ï
177 ¥¯¥í¥Ã¥¯¤òÍѤ¤¤Æ»þ¹ï¤ò·×¬¤·¤Æ¤¤¤ë¡£
178 .\" See also http://thread.gmane.org/gmane.linux.kernel/696854/
179 .\" Subject: nanosleep() uses CLOCK_MONOTONIC, should be CLOCK_REALTIME?
180 .\" Date: 2008-06-22 07:35:41 GMT
181 ¤³¤Î¤³¤È¤Ï¤ª¤½¤é¤¯ÌäÂê¤Ë¤Ê¤é¤Ê¤¤¤À¤í¤¦¡£
183 .BR clock_settime (2)
188 ¤Ë±Æ¶Á¤¹¤Ù¤¤Ç¤Ï¤Ê¤¤¡¢¤È½ñ¤«¤ì¤Æ¤¤¤ë¤«¤é¤Ç¤¢¤ë¡£
191 .BR clock_settime (2)
194 ¥¯¥í¥Ã¥¯¤ÎÃͤòÀßÄꤷ¤Æ¤â¡¢
198 ¤Ë´ð¤Å¤¯¥µ¡¼¥Ó¥¹¤Ë¤è¤êÁêÂÐŪ¤Ê´ü´Ö¤À¤±¼Â¹Ô¤òÄä»ß¤¹¤ë¥¹¥ì¥Ã¥É¤Ë¤Ï±Æ¶Á¤Ï¤Ê¤¤¡£
199 ·ë²Ì¤È¤·¤Æ¡¢¥¯¥í¥Ã¥¯Ãͤ¬¹¹¿·Á°¤«¸å¤«¤Ë´Ø¤ï¤é¤º¡¢Í׵ᤵ¤ì¤¿ÁêÂÐŪ¤Ê»þ´Ö¤¬
200 ·Ð²á¤¹¤ë¤ÈËþλ¤¹¤ë¤³¤È¤Ë¤Ê¤ë¡£
203 (Î㤨¤Ð¡¢»þ´Ö¤¬½ÅÍפʰÕÌ£¤ò»ý¤Ä¥Ï¡¼¥É¥¦¥§¥¢¤òÀ©¸æ¤¹¤ë¾ì¹ç¤Ê¤É)
204 ¤è¤êÀµ³Î¤ÊÄä»ß¤òɬÍפȤ¹¤ë¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤ËÂбþ¤¹¤ë¤¿¤á¤Ë¡¢
206 ¤Ï¡¢¥Þ¥¤¥¯¥íÉÃÀºÅ٤Υӥ¸¡¼¡¦¥¦¥§¥¤¥È¤òÍøÍѤ¹¤ë¤³¤È¤Ç¡¢
207 2\ ms °Ê²¼¤ÎÄä»ß¤ò¹Ô¤¦¤³¤È¤¬¤Ç¤¤¿¡£
208 ⤷¡¢¤³¤Îµ¡Ç½¤òÍøÍѤ¹¤ë¤Ë¤Ï¡¢¸Æ¤Ó½Ð¤·¸µ¤Î¥¹¥ì¥Ã¥É¤¬
212 ¤È¤¤¤Ã¤¿¥ê¥¢¥ë¥¿¥¤¥à¡¦¥Ý¥ê¥·¡¼¤Î¸µ¤Ç¥¹¥±¥¸¥å¡¼¥ê¥ó¥°¤µ¤ì¤Æ¤¤¤ë
214 ¤³¤ÎÆÃÊ̤ʳÈÄ¥¤Ï¥«¡¼¥Í¥ë 2.5.39 ¤Çºï½ü¤µ¤ì¤¿¡£¤·¤¿¤¬¤Ã¤Æ¡¢
215 ¸½ºß¤Î 2.4 ·ÏÎó¤Î¥«¡¼¥Í¥ë¤Ë¤Ï¤³¤Îµ¡Ç½¤¬Â¸ºß¤¹¤ë¤¬¡¢
216 2.6·ÏÎó¤Î¥«¡¼¥Í¥ë¤Ë¤Ï¤Ê¤¤¡£
222 ¤Ê¤É¤Î) ¥·¥°¥Ê¥ë¤Ë¤è¤êÄä»ß¤µ¤ì¤¿¾ì¹ç¡¢
226 ¥·¥°¥Ê¥ë¤Ë¤è¤ë¥¹¥ì¥Ã¥É¤ÎºÆ³«¸å¤Ë
229 ¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬¤³¤Î¸å¤ÇºÆ¥¹¥¿¡¼¥È¤µ¤ì¤¿¾ì¹ç¡¢
230 ¥¹¥ì¥Ã¥É¤¬Ää»ß¾õÂ֤ˤ¢¤ë´Ö¤Ë·Ð²á¤·¤¿»þ´Ö¤Ï
231 Ää»ß´ü´Ö¤È¤·¤Æ¥«¥¦¥ó¥È¡Ö¤µ¤ì¤Ê¤¤¡×¡£
233 .BR clock_nanosleep (2),
234 .BR sched_setscheduler (2),
235 .BR timer_create (2),