| time.9 (79538) | time.9 (79727) |
|---|---|
| 1.\" $NetBSD: time.9,v 1.1 1995/11/25 21:24:53 perry Exp $ 2.\" 3.\" Copyright (c) 1994 Christopher G. Demetriou 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: --- 15 unchanged lines hidden (view full) --- 24.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31.\" | 1.\" $NetBSD: time.9,v 1.1 1995/11/25 21:24:53 perry Exp $ 2.\" 3.\" Copyright (c) 1994 Christopher G. Demetriou 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: --- 15 unchanged lines hidden (view full) --- 24.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31.\" |
| 32.\" $FreeBSD: head/share/man/man9/time.9 79538 2001-07-10 15:31:11Z ru $ | 32.\" $FreeBSD: head/share/man/man9/time.9 79727 2001-07-14 19:41:16Z schweikh $ |
| 33.\" 34.Dd March 22, 1997 35.Dt TIME 9 36.Os 37.Sh NAME 38.Nm boottime , 39.Nm mono_time , 40.Nm runtime , --- 29 unchanged lines hidden (view full) --- 70at system boot, and is updated when the system time is adjusted 71with 72.Xr settimeofday 2 . 73.Pp 74The 75.Va runtime 76variable holds the time that the system switched to the 77current process. | 33.\" 34.Dd March 22, 1997 35.Dt TIME 9 36.Os 37.Sh NAME 38.Nm boottime , 39.Nm mono_time , 40.Nm runtime , --- 29 unchanged lines hidden (view full) --- 70at system boot, and is updated when the system time is adjusted 71with 72.Xr settimeofday 2 . 73.Pp 74The 75.Va runtime 76variable holds the time that the system switched to the 77current process. |
| 78It is set after each context switch, | 78It is set after each context switch, |
| 79and is updated when the system time is adjusted with 80.Xr settimeofday 2 . 81Because 82.Va runtime 83is used for system accounting, it is set with the high-resolution 84.Xr microtime 9 85function, rather than being copied from 86.Va time . --- 31 unchanged lines hidden (view full) --- 118.Va runtime 119variables may be read and written without special precautions. 120.Pp 121It should be noted that due to the differences in how the time values 122returned by 123.Xr gettime 9 124and 125.Xr microtime 9 | 79and is updated when the system time is adjusted with 80.Xr settimeofday 2 . 81Because 82.Va runtime 83is used for system accounting, it is set with the high-resolution 84.Xr microtime 9 85function, rather than being copied from 86.Va time . --- 31 unchanged lines hidden (view full) --- 118.Va runtime 119variables may be read and written without special precautions. 120.Pp 121It should be noted that due to the differences in how the time values 122returned by 123.Xr gettime 9 124and 125.Xr microtime 9 |
| 126are updated, comparing the results of the two routines | 126are updated, comparing the results of the two routines |
| 127may result in a time value that appears to go backwards. 128This can be avoided by consistently using one function or the other 129for use in any given context. 130.Sh SEE ALSO 131.Xr settimeofday 2 , 132.Xr gettime 9 , 133.\" .Xr hardclock 9 , 134.\" .Xr hz 9 , 135.Xr inittodr 9 , 136.Xr microtime 9 137.Sh BUGS 138The notion of having a single 139.Va runtime 140variable obviously would not be appropriate in multiprocessor systems. | 127may result in a time value that appears to go backwards. 128This can be avoided by consistently using one function or the other 129for use in any given context. 130.Sh SEE ALSO 131.Xr settimeofday 2 , 132.Xr gettime 9 , 133.\" .Xr hardclock 9 , 134.\" .Xr hz 9 , 135.Xr inittodr 9 , 136.Xr microtime 9 137.Sh BUGS 138The notion of having a single 139.Va runtime 140variable obviously would not be appropriate in multiprocessor systems. |