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| author | Pekka Paalanen <pekka.paalanen@collabora.co.uk> | 2015-07-03 15:08:53 +0300 |
|---|---|---|
| committer | Pekka Paalanen <pekka.paalanen@collabora.co.uk> | 2015-07-16 13:55:05 +0300 |
| commit | d7894d052a8e8944d20e1f751f3275382e48cc12 (patch) | |
| tree | 98a0c1b0b84669509e1d4aa14c83111e7404466f /shared | |
| parent | aa21f6249f746e9d83c59161abd175dd10253221 (diff) | |
| download | weston-d7894d052a8e8944d20e1f751f3275382e48cc12.tar.gz | |
compositor,shared: add millihz_to_nsec()
A helper to improbe readability.
Cc: Daniel Stone <daniels@collabora.com>
Cc: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Diffstat (limited to 'shared')
| -rw-r--r-- | shared/timespec-util.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/shared/timespec-util.h b/shared/timespec-util.h index 0e05efc7..edd4ec14 100644 --- a/shared/timespec-util.h +++ b/shared/timespec-util.h @@ -26,6 +26,9 @@ #ifndef TIMESPEC_UTIL_H #define TIMESPEC_UTIL_H +#include <stdint.h> +#include <assert.h> + #define NSEC_PER_SEC 1000000000 /* Subtract timespecs @@ -57,5 +60,16 @@ timespec_to_nsec(const struct timespec *a) return (int64_t)a->tv_sec * NSEC_PER_SEC + a->tv_nsec; } +/* Convert milli-Hertz to nanoseconds + * + * \param mhz frequency in mHz, not zero + * \return period in nanoseconds + */ +static inline int64_t +millihz_to_nsec(uint32_t mhz) +{ + assert(mhz > 0); + return 1000000000000LL / mhz; +} #endif /* TIMESPEC_UTIL_H */ |