[linuxjm/LDP_man-pages.git] / draft / man2 / clock_nanosleep.2

.\" Copyright (c) 2008, Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Japanese Version Copyright (c) 2008  Akihiro MOTOKI
.\"         all rights reserved.
.\" Translated 2008-08-21, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.04
.\" 
.TH CLOCK_NANOSLEEP 2 2010-09-10 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O clock_nanosleep \- high-resolution sleep with specifiable clock
clock_nanosleep \- »ØÄꤷ¤¿¥¯¥í¥Ã¥¯¤Ç¤Î¹âÀºÅ٤ʼ¹ÔÄä»ß (sleep)
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.B #include <time.h>
.nf
.sp
.BI "int clock_nanosleep(clockid_t " clock_id ", int " flags ,
.BI "                    const struct timespec *" request ,
.BI "                    struct timespec *" remain );
.fi
.sp
.\"O Link with \fI\-lrt\fP.
\fI\-lrt\fP ¤Ç¥ê¥ó¥¯¤¹¤ë¡£
.sp
.ad l
.in -4n
.\"O Feature Test Macro Requirements for glibc (see
.\"O .BR feature_test_macros (7)):
glibc ¸þ¤±¤Îµ¡Ç½¸¡ºº¥Þ¥¯¥í¤ÎÍ×·ï
.RB ( feature_test_macros (7)
»²¾È):
.in
.sp
.BR clock_nanosleep ():
.RS 4
_XOPEN_SOURCE\ >=\ 600 || _POSIX_C_SOURCE\ >=\ 200112L
.RE
.ad
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O Like
.\"O .BR nanosleep (2),
.\"O .BR clock_nanosleep ()
.\"O allows the caller to sleep for an interval specified
.\"O with nanosecond precision.
.\"O It differs in allowing the caller to select the clock against
.\"O which the sleep interval is to be measured,
.\"O and in allowing the sleep interval to be specified as
.\"O either an absolute or a relative value.
.BR clock_nanosleep ()
¤ò»È¤¦¤È¡¢
.BR nanosleep (2)
ƱÍÍ¡¢¥Ê¥ÎÉäÎÀºÅ٤ǻØÄꤵ¤ì¤¿´ü´Ö¤À¤±¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤Î¼Â¹Ô¤ò
Ää»ß¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
.BR nanosleep (2)
¤È°ã¤¦¤Î¤Ï¡¢¸Æ¤Ó½Ð¤·Â¦¤¬Ää»ß´ü´Ö¤ò¤É¤Î¥¯¥í¥Ã¥¯¤ËÂФ·¤Æ·×¬¤¹¤ë¤Î¤«¤òÁªÂò
¤Ç¤­¤ëÅÀ¤È¡¢Ää»ß´ü´Ö¤òÀäÂÐÃͤǤâÁêÂÐÃͤǤâ»ØÄê¤Ç¤­¤ëÅÀ¤Ç¤¢¤ë¡£

.\"O The time values passed to and returned by this call are specified using
.\"O .I timespec
.\"O structures, defined as follows:
¤³¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤ËÅϤ·¤¿¤ê¡¢¤³¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬ÊÖ¤·¤¿¤ê¤¹¤ë»þ´Ö¤ÎÃͤÏ
.I timespec
¹½Â¤ÂΤò»È¤Ã¤Æ»ØÄꤵ¤ì¤ë¡£¤³¤Î¹½Â¤ÂΤÎÄêµÁ¤Ï°Ê²¼¤ÎÄ̤ê¤Ç¤¢¤ë¡£
.sp
.in +4n
.nf
struct timespec {
    time_t tv_sec;        /* seconds */
    long   tv_nsec;       /* nanoseconds [0 .. 999999999] */
};
.fi
.in

.\"O The
.\"O .I clock_id
.\"O argument specifies the clock against which the sleep interval
.\"O is to be measured.
.\"O This argument can have one of the following values:
.I clock_id
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¤³¤Î°ú¤­¿ô¤Ë¤Ï°Ê²¼¤ÎÃͤΤ¤¤º¤ì¤«°ì¤Ä¤ò»ØÄê¤Ç¤­¤ë¡£
.TP 17
.BR CLOCK_REALTIME
.\"O A settable system-wide real-time clock.
¥·¥¹¥Æ¥àÁ´ÂΤǻȤï¤ì¤ë¼Â»þ´Ö¥¯¥í¥Ã¥¯¡£
¤³¤Î¥¯¥í¥Ã¥¯¤ÏÊѹ¹²Äǽ¤Ç¤¢¤ë¡£
.TP
.BR CLOCK_MONOTONIC
.\"O A nonsettable, monotonically increasing clock that measures time
.\"O since some unspecified point in the past that does not change after
.\"O system startup.
.\"O .\" On Linux this clock measures time since boot.
²áµî¤Î¤¢¤ë»þÅÀ¤«¤é¤Î»þ´Ö¤ò·×¬¤¹¤ë¡¢Ã±Ä´Áý²Ã¤Î¥¯¥í¥Ã¥¯¡£
µ¯ÅÀ¤È¤Ê¤ë»þÅÀ¤Ï¥·¥¹¥Æ¥àµ¯Æ°¸å¤Ë¤ÏÊѹ¹¤µ¤ì¤Ê¤¤¡£
¤³¤Î¥¯¥í¥Ã¥¯¤ÏÊѹ¹¤¹¤ë¤³¤È¤¬¤Ç¤­¤Ê¤¤¡£
.\" Linux ¤Ç¤Ï¡¢¤³¤Î¥¯¥í¥Ã¥¯¤Ïµ¯Æ°¤«¤é¤Î»þ´Ö¤ò·×¬¤¹¤ë¡£
.TP
.BR CLOCK_PROCESS_CPUTIME_ID
.\"O A settable per-process clock that measures CPU time consumed
.\"O by all threads in the process.
¤½¤Î¥×¥í¥»¥¹¤ÎÁ´¥¹¥ì¥Ã¥É¤Ç¾ÃÈñ¤µ¤ì¤ë CPU »þ´Ö¤ò·×¬¤¹¤ë¥×¥í¥»¥¹Ã±°Ì¤Î
¥¯¥í¥Ã¥¯¡£¤³¤Î¥¯¥í¥Ã¥¯¤ÏÀßÄê²Äǽ¤Ç¤¢¤ë¡£
.\" There is some trickery between glibc and the kernel
.\" to deal with the CLOCK_PROCESS_CPUTIME_ID case.
.PP
.\"O See
.\"O .BR clock_getres (2)
.\"O for further details on these clocks.
¤³¤ì¤é¤Î¥¯¥í¥Ã¥¯¤Î¾ÜºÙ¤Ë¤Ä¤¤¤Æ¤Ï
.BR clock_getres (2)
¤ò»²¾È¡£

.\"O If
.\"O .I flags
.\"O is 0, then the value specified in
.\"O .I request
.\"O is interpreted as an interval relative to the current
.\"O value of the clock specified by
.\"O .IR clock_id .
.I flags
¤¬ 0 ¤Î¾ì¹ç¡¢
.I request
¤Ë»ØÄꤵ¤ì¤¿ÃͤÏ
.I clock_id
¤Ç»ØÄꤵ¤ì¤¿¥¯¥í¥Ã¥¯¤Î¸½ºß¤ÎÃͤ«¤é¤ÎÁêÂÐŪ¤Ê´ü´Ö¤È²ò¼á¤µ¤ì¤ë¡£

.\"O If
.\"O .I flags
.\"O is
.\"O .BR TIMER_ABSTIME ,
.\"O then
.\"O .I request
.\"O is interpreted as an absolute time as measured by the clock,
.\"O .IR clock_id .
.\"O If
.\"O .I request
.\"O is less than or equal to the current value of the clock,
.\"O then
.\"O .BR clock_nanosleep ()
.\"O returns immediately without suspending the calling thread.
.I flags
¤¬
.B TIMER_ABSTIME
¤Î¾ì¹ç¡¢
.I request
¤Ï»ØÄꤵ¤ì¤¿¥¯¥í¥Ã¥¯¤Ç·×¬¤µ¤ì¤ëÀäÂлþ¹ï¤È²ò¼á¤µ¤ì¤ë¡£
.I request
¤¬»ØÄꤵ¤ì¤¿¥¯¥í¥Ã¥¯¤Î¸½ºß¤ÎÃͰʲ¼¤Î¾ì¹ç¡¢
.BR clock_nanosleep ()
¤Ï¡¢¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤ÎÄä»ß¤ò¹Ô¤ï¤º¡¢¤¹¤°¤ËÊ֤롣

.\"O .BR clock_nanosleep ()
.\"O suspends the execution of the calling thread
.\"O until either at least the time specified by
.\"O .IR request
.\"O has elapsed,
.\"O or a signal is delivered that causes a signal handler to be called or
.\"O that terminates the process.
.BR clock_nanosleep ()
¤Ï¡¢¾¯¤Ê¤¯¤È¤â
.I request
¤Ç»ØÄꤵ¤ì¤¿»þ´Ö¤¬·Ð²á¤¹¤ë¤Þ¤Ç¡¢¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤Î¼Â¹Ô¤òÄä»ß¤¹¤ë¡£
¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤¬¸Æ¤Ó½Ð¤µ¤ì¤¿¤ê¡¢¤½¤Î¥×¥í¥»¥¹¤ò½ªÎ»¤µ¤»¤ë¤è¤¦¤Ê
¥·¥°¥Ê¥ë¤¬ÇÛÁ÷¤µ¤ì¤¿¤ê¤·¤¿¾ì¹ç¤Ë¤â¡¢¥¹¥ì¥Ã¥É¤Î¼Â¹ÔÄä»ß¤Ï½ªÎ»¤¹¤ë¡£

.\"O If the call is interrupted by a signal handler,
.\"O .BR clock_nanosleep ()
.\"O fails with the error
.\"O .BR EINTR .
.\"O In addition, if
.\"O .I remain
.\"O is not NULL, and
.\"O .I flags
.\"O was not
.\"O .BR TIMER_ABSTIME ,
.\"O it returns the remaining unslept time in
.\"O .IR remain .
.\"O This value can then be used to call
.\"O .BR clock_nanosleep ()
.\"O again and complete a (relative) sleep.
¸Æ¤Ó½Ð¤·¤¬¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤Ã¤Æ³ä¤ê¹þ¤Þ¤ì¤¿¾ì¹ç¡¢
.BR clock_nanosleep ()
¤Ï¥¨¥é¡¼
.B EINTR
¤Ç¼ºÇÔ¤¹¤ë¡£¤µ¤é¤Ë¡¢
.I remain
¤¬ NULL ¤Ç¤Ê¤¯¡¢¤«¤Ä
.I flags
¤¬
.B TIMER_ABSTIME
¤Ç¤Ê¤¤¾ì¹ç¤Ë¤Ï¡¢
.I remain
¤Ë»Ä¤ê¤ÎÄä»ß»þ´Ö¤¬ÊÖ¤µ¤ì¤ë¡£
¤³¤ÎÃͤò»È¤Ã¤Æ
.BR clock_nanosleep ()
¤òºÆÅٸƤӽФ¹¤³¤È¤Ç¡¢(ÁêÂÐŪ¤Ê´ü´Ö¤Î) Ää»ß¤ò´°Î»¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On successfully sleeping for the requested interval,
.\"O .BR clock_nanosleep ()
.\"O returns 0.
.\"O If the call is interrupted by a signal handler or encounters an error,
.\"O then it returns one of the positive error number listed in ERRORS.
Í׵ᤵ¤ì¤¿´ü´Ö¤ÎÄä»ß¤ËÀ®¸ù¤¹¤ë¤È¡¢
.BR clock_nanosleep ()
¤Ï 0 ¤òÊÖ¤¹¡£
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.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.TP
.B EFAULT
.\"O .I request
.\"O or
.\"O .I remain
.\"O specified an invalid address.
.I request
¤ä
.I remain
¤Ë̵¸ú¤Ê¥¢¥É¥ì¥¹¤¬»ØÄꤵ¤ì¤¿¡£
.TP
.B EINTR
.\"O The sleep was interrupted by a signal handler.
Ää»ß¤¬¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤ê³ä¤ê¹þ¤Þ¤ì¤¿¡£
.TP
.B EINVAL
.\"O The value in the
.\"O .I tv_nsec
.\"O field was not in the range 0 to 999999999 or
.\"O .I tv_sec
.\"O was negative.
.I tv_nsec
¥Õ¥£¡¼¥ë¥É¤ÎÃͤ¬ 0 ¤«¤é 999999999 ¤ÎÈϰϤǤʤ¤¤«¡¢
.I tv_sec
¤ÎÃͤ¬Éé¤Ç¤¢¤Ã¤¿¡£
.TP
.B EINVAL
.\"O .I clock_id
.\"O was invalid.
.\"O .RB ( CLOCK_THREAD_CPUTIME_ID
.\"O is not a permitted value for
.\"O .IR clock_id .)
.I clock_id
¤¬Ìµ¸ú¤Ç¤¢¤Ã¤¿
.RB ( CLOCK_THREAD_CPUTIME_ID
¤¬
.I clock_id
¤È¤·¤ÆÍ­¸ú¤ÊÃͤǤϤʤ¤)¡£
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O The
.\"O .BR clock_nanosleep ()
.\"O system call first appeared in Linux 2.6.
.\"O Support is available in glibc since version 2.1.
.BR clock_nanosleep ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï Linux 2.6 ¤Ç½é¤á¤ÆÅо줷¤¿¡£
glibc ¤Ç¤Ï¥Ð¡¼¥¸¥ç¥ó 2.1 °Ê¹ß¤Ç¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
POSIX.1-2001.
.\"O .SH NOTES
.SH Ãí°Õ
.\"O If the interval specified in
.\"O .I request
.\"O is not an exact multiple of the granularity underlying clock (see
.\"O .BR time (7)),
.\"O then the interval will be rounded up to the next multiple.
.\"O Furthermore, after the sleep completes, there may still be a delay before
.\"O the CPU becomes free to once again execute the calling thread.
.I request
¤Ç»ØÄꤵ¤ì¤¿Ää»ß´ü´Ö¤¬¡¢»þ´Ö¤Î·×¬¤Ë»ÈÍѤµ¤ì¤ë¥¯¥í¥Ã¥¯
.RB ( time (7)
»²¾È) ¤ÎÀºÅÙ¤ÎÇÜ¿ô¤Á¤ç¤¦¤É¤Ç¤Ê¤¤¾ì¹ç¡¢Ää»ß´ü´Ö¤Ï°ìÈֶᤤ¼¡¤ÎÇÜ¿ô¤Ë
ÀÚ¤ê¾å¤²¤é¤ì¤ë¡£¤µ¤é¤Ë¡¢Ää»ß¤¬´°Î»¤·¤¿¸å¤Ë¡¢CPU ¤¬¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤ò
¤â¤¦°ìÅټ¹ԤǤ­¤ë¤è¤¦¤Ë¤Ê¤ë¤Þ¤Ç¤Ë¤Ï¡¢Ãٱ䤬Æþ¤ë²ÄǽÀ­¤¬¤¢¤ë¡£

.\"O Using an absolute timer is useful for preventing
.\"O timer drift problems of the type described in
.\"O .BR nanosleep (2).
.\"O (Such problems are exacerbated in programs that try to restart
.\"O a relative sleep that is repeatedly interrupted by signals.)
ÀäÂÐÃÍ»ØÄê¤Î¥¿¥¤¥Þ¤ò»È¤¦¤Î¤Ï¡¢
.BR nanosleep (2)
¤Ë½ñ¤«¤ì¤Æ¤¤¤ëÎà¤Î¥¿¥¤¥Þ¤Î¤º¤ì¤ÎÌäÂê¤òËɻߤ¹¤ë¤Î¤ËÌòΩ¤Ä
(¤³¤Î¼ï¤ÎÌäÂê¤Ï¡¢¥·¥°¥Ê¥ë¤Ë³ä¤ê¹þ¤Þ¤ì¤¿ºÝ¤ËÁêÂлØÄê¤ÎÄä»ß¤ò
·«¤êÊÖ¤·ºÆ³«¤·¤è¤¦¤È¤¹¤ë¥×¥í¥°¥é¥à¤Ç¤Ï¡¢¤«¤¨¤Ã¤Æ°­²½¤¹¤ë)¡£
.\"O To perform a relative sleep that avoids these problems, call
.\"O .BR clock_gettime (2)
.\"O for the desired clock,
.\"O add the desired interval to the returned time value,
.\"O and then call
.\"O .BR clock_nanosleep ()
.\"O with the
.\"O .B TIMER_ABSTIME
.\"O flag.
¤³¤ì¤é¤ÎÌäÂê¤ò²óÈò¤·¤ÆÁêÂлØÄê¤ÎÄä»ß¤ò¼Â¹Ô¤¹¤ë¤Ë¤Ï¡¢
´õ˾¤¹¤ë¥¯¥í¥Ã¥¯¤Ç
.BR clock_gettime (2)
¤ò¸Æ¤Ó½Ð¤·¡¢¤½¤ÎÊÖ¤êÃͤλþ¹ïÃͤ˴õ˾¤¹¤ë´ü´Ö¤ò²Ã»»¤·¤Æ¤«¤é¡¢
.B TIMER_ABSTIME
¥Õ¥é¥°¤ò»ØÄꤷ¤Æ
.BR clock_nanosleep ()
¤ò¸Æ¤Ó½Ð¤¹¡£

.\"O .BR clock_nanosleep ()
.\"O is never restarted after being interrupted by a signal handler,
.\"O regardless of the use of the
.\"O .BR sigaction (2)
.\"O .B SA_SIGACTION
.\"O flag.
.BR sigaction (2)
¤Ç
.BR SA_RESTART
¥Õ¥é¥°¤¬»ØÄꤵ¤ì¤Æ¤¤¤ë¤«¤Ë´Ø¤ï¤é¤º¡¢
¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤ê³ä¤ê¹þ¤Þ¤ì¤¿¸å¤Ë
.BR clock_nanosleep ()
¤¬ºÆ³«¤µ¤ì¤ë¤³¤È¤Ï·è¤·¤Æ¤Ê¤¤¡£

.\"O The
.\"O .I remain
.\"O argument is unused, and unnecessary, when
.\"O .I flags
.\"O is
.\"O .BR TIMER_ABSTIME .
.\"O (An absolute sleep can be restarted using the same
.\"O .I request
.\"O argument.)
.I flags
¤¬
.B TIMER_ABSTIME
¤Î¾ì¹ç¡¢
.I remain
°ú¤­¿ô¤Ï»ÈÍѤµ¤ì¤º¡¢ÉÔÍפǤ¢¤ë
(ÀäÂÐÃͤǤÎÄä»ß¤Ç¤Ï¡¢Æ±¤¸
.I request
°ú¤­¿ô¤ò»È¤Ã¤ÆºÆÅٸƤӽФ¹¤³¤È¤¬¤Ç¤­¤ë)¡£

.\"O POSIX.1 specifies that
.\"O .BR clock_nanosleep ()
.\"O has no effect on signals dispositions or the signal mask.
POSIX.1 ¤Îµ¬Äê¤Ç¤Ï¡¢
.BR clock_nanosleep ()
¤Ï¥·¥°¥Ê¥ë¤Î½èÍýÊýË¡¤ä¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤Ë±Æ¶Á¤òÍ¿¤¨¤Ê¤¤¡¢¤È¤µ¤ì¤Æ¤¤¤ë¡£

.\"O POSIX.1 specifies that after changing the value of the
.\"O .B CLOCK_REALTIME
.\"O clock via
.\"O .BR clock_settime (2),
.\"O the new clock value shall be used to determine the time
.\"O at which a thread blocked on an absolute
.\"O .BR clock_nanosleep ()
.\"O will wake up;
.\"O if the new clock value falls past the end of the sleep interval, then the
.\"O .BR clock_nanosleep ()
.\"O call will return immediately.
POSIX.1 ¤Îµ¬Äê¤Ç¤Ï¡¢
.BR clock_settime (2)
¤Ç
.B CLOCK_REALTIME
¥¯¥í¥Ã¥¯¤ÎÃͤòÊѹ¹¤·¤¿¸å¤Ï¡¢ÀäÂÐÃÍ»ØÄê¤Î
.BR clock_nanosleep ()
¤ÇÄä»ß¤·¤Æ¤¤¤ë¥¹¥ì¥Ã¥É¤òµ¯Æ°¤µ¤»¤ë»þ¹ï¤ÎȽÄê¤Ï¡¢
¿·¤·¤¤¥¯¥í¥Ã¥¯Ãͤò»È¤Ã¤Æ¹Ô¤ï¤ì¤ë¡¢¤È¤µ¤ì¤Æ¤¤¤ë¡£
¿·¤·¤¤¥¯¥í¥Ã¥¯Ãͤˤª¤¤¤ÆÄä»ß´ü´Ö¤Î½ªÎ»»þ¹ï¤¬²áµî¤Ë¤Ê¤Ã¤Æ¤·¤Þ¤Ã¤¿¾ì¹ç¤Ë¤Ï¡¢
.BR clock_nanosleep ()
¤Ï¤¹¤°¤ËÊ֤뤳¤È¤Ë¤Ê¤ë¡£

.\"O POSIX.1 specifies that
.\"O changing the value of the
.\"O .B CLOCK_REALTIME
.\"O clock via
.\"O .BR clock_settime (2)
.\"O shall have no effect on a thread that is blocked on a relative
.\"O .BR clock_nanosleep ().
POSIX.1 ¤Îµ¬Äê¤Ç¤Ï¡¢
.BR clock_settime (2)
¤Ç
.B CLOCK_REALTIME
¥¯¥í¥Ã¥¯¤ÎÃͤòÊѹ¹¤·¤Æ¤â¡¢ÁêÂÐÃÍ»ØÄê¤Î
.BR clock_nanosleep ()
¤ÇÄä»ß¤·¤Æ¤¤¤ë¥¹¥ì¥Ã¥É¤Ë¤Ï±Æ¶Á¤òÍ¿¤¨¤Ê¤¤¡¢¤È¤µ¤ì¤Æ¤¤¤ë¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR clock_getres (2),
.BR nanosleep (2),
.BR timer_create (2),
.BR sleep (3),
.BR usleep (3),
.BR time (7)