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timespec: Add timespec_add_nsec helper

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Add a (timespec) = (timespec) + (nsec) helper, to save intermediate
conversions to nanoseconds in its users.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Daniel Stone
2017-03-01 11:34:00 +00:00
committed by Pekka Paalanen
parent 11ae2a3036
commit 5ae7e84c6b
3 changed files with 155 additions and 0 deletions
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shared/timespec-util.h
+21
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@@ -49,6 +49,27 @@ timespec_sub(struct timespec *r,
}
}
/* Add a nanosecond value to a timespec
*
* \param r[out] result: a + b
* \param a[in] base operand as timespec
* \param b[in] operand in nanoseconds
*/
static inline void
timespec_add_nsec(struct timespec *r, const struct timespec *a, int64_t b)
{
r->tv_sec = a->tv_sec + (b / NSEC_PER_SEC);
r->tv_nsec = a->tv_nsec + (b % NSEC_PER_SEC);
if (r->tv_nsec >= NSEC_PER_SEC) {
r->tv_sec++;
r->tv_nsec -= NSEC_PER_SEC;
} else if (r->tv_nsec < 0) {
r->tv_sec--;
r->tv_nsec += NSEC_PER_SEC;
}
}
/* Convert timespec to nanoseconds
*
* \param a timespec