Messages in this thread Patch in this message | | | Subject | [Patch 1/9] timestamp diff | From | Shailabh Nagar <> | Date | Mon, 13 Mar 2006 19:42:19 -0500 |
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nstimestamp_diff.patch
Add kernel utility function for measuring the interval (diff) between two timespec values
Comments addressed (commenter)
- returns difference as timespec instead of nsecs (Arjan)
Signed-off-by: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Shailabh Nagar <nagar@us.ibm.com>
include/linux/time.h | 14 ++++++++++++++ 1 files changed, 14 insertions(+)
Index: linux-2.6.16-rc5/include/linux/time.h =================================================================== --- linux-2.6.16-rc5.orig/include/linux/time.h 2006-03-10 17:56:56.000000000 -0500 +++ linux-2.6.16-rc5/include/linux/time.h 2006-03-10 17:57:26.000000000 -0500 @@ -147,6 +147,20 @@ extern struct timespec ns_to_timespec(co */ extern struct timeval ns_to_timeval(const nsec_t nsec); +/** + * timespec_diff - Return difference of timespecs as a timespec + * @start: first timespec + * @end: second timespec + * @ret: result timespec + * + * Returns the difference between @start and @end in @ret + */ +static inline void timespec_diff(struct timespec *start, struct timespec *end, + struct timespec *ret) +{ + ret->tv_sec = end->tv_sec - start->tv_sec; + ret->tv_nsec = end->tv_nsec - start->tv_nsec; +} #endif /* __KERNEL__ */ #define NFDBITS __NFDBITS
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