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timespec: Pull in timespec.h from weston
Signed-off-by: Sebastian Wick <sebastian.wick@redhat.com>
This commit is contained in:
Sebastian Wick
Derek Foreman
parent
bdba21ec92
commit
37469d5ced
1 changed files with 259 additions and 0 deletions
259
src/timespec-util.h
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259
src/timespec-util.h
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/*
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* Copyright © 2014 - 2015 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef TIMESPEC_UTIL_H
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#define TIMESPEC_UTIL_H
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#include <stdint.h>
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#include <assert.h>
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#include <time.h>
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#include <stdbool.h>
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#define NSEC_PER_SEC 1000000000
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/* Subtract timespecs
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*
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* \param r[out] result: a - b
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* \param a[in] operand
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* \param b[in] operand
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*/
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static inline void
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timespec_sub(struct timespec *r,
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const struct timespec *a, const struct timespec *b)
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{
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r->tv_sec = a->tv_sec - b->tv_sec;
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r->tv_nsec = a->tv_nsec - b->tv_nsec;
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if (r->tv_nsec < 0) {
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r->tv_sec--;
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r->tv_nsec += NSEC_PER_SEC;
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}
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}
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/* Add a nanosecond value to a timespec
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*
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* \param r[out] result: a + b
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* \param a[in] base operand as timespec
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* \param b[in] operand in nanoseconds
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*/
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static inline void
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timespec_add_nsec(struct timespec *r, const struct timespec *a, int64_t b)
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{
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r->tv_sec = a->tv_sec + (b / NSEC_PER_SEC);
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r->tv_nsec = a->tv_nsec + (b % NSEC_PER_SEC);
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if (r->tv_nsec >= NSEC_PER_SEC) {
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r->tv_sec++;
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r->tv_nsec -= NSEC_PER_SEC;
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} else if (r->tv_nsec < 0) {
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r->tv_sec--;
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r->tv_nsec += NSEC_PER_SEC;
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}
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}
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/* Add a millisecond value to a timespec
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*
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* \param r[out] result: a + b
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* \param a[in] base operand as timespec
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* \param b[in] operand in milliseconds
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*/
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static inline void
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timespec_add_msec(struct timespec *r, const struct timespec *a, int64_t b)
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{
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timespec_add_nsec(r, a, b * 1000000);
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}
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/* Convert timespec to nanoseconds
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*
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* \param a timespec
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* \return nanoseconds
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*/
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static inline int64_t
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timespec_to_nsec(const struct timespec *a)
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{
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return (int64_t)a->tv_sec * NSEC_PER_SEC + a->tv_nsec;
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}
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/* Subtract timespecs and return result in nanoseconds
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*
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* \param a[in] operand
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* \param b[in] operand
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* \return to_nanoseconds(a - b)
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*/
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static inline int64_t
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timespec_sub_to_nsec(const struct timespec *a, const struct timespec *b)
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{
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struct timespec r;
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timespec_sub(&r, a, b);
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return timespec_to_nsec(&r);
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}
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/* Convert timespec to milliseconds
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*
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* \param a timespec
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* \return milliseconds
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*
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* Rounding to integer milliseconds happens always down (floor()).
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*/
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static inline int64_t
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timespec_to_msec(const struct timespec *a)
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{
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return (int64_t)a->tv_sec * 1000 + a->tv_nsec / 1000000;
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}
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/* Subtract timespecs and return result in milliseconds
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*
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* \param a[in] operand
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* \param b[in] operand
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* \return to_milliseconds(a - b)
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*/
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static inline int64_t
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timespec_sub_to_msec(const struct timespec *a, const struct timespec *b)
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{
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return timespec_sub_to_nsec(a, b) / 1000000;
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}
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/* Convert timespec to microseconds
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*
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* \param a timespec
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* \return microseconds
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*
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* Rounding to integer microseconds happens always down (floor()).
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*/
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static inline int64_t
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timespec_to_usec(const struct timespec *a)
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{
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return (int64_t)a->tv_sec * 1000000 + a->tv_nsec / 1000;
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}
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/* Convert timespec to protocol data
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*
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* \param a timespec
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* \param tv_sec_hi[out] the high bytes of the seconds part
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* \param tv_sec_lo[out] the low bytes of the seconds part
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* \param tv_nsec[out] the nanoseconds part
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*
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* The input timespec must be normalized (the nanoseconds part should
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* be less than 1 second) and non-negative.
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*/
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static inline void
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timespec_to_proto(const struct timespec *a, uint32_t *tv_sec_hi,
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uint32_t *tv_sec_lo, uint32_t *tv_nsec)
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{
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assert(a->tv_sec >= 0);
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assert(a->tv_nsec >= 0 && a->tv_nsec < NSEC_PER_SEC);
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uint64_t sec64 = a->tv_sec;
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*tv_sec_hi = sec64 >> 32;
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*tv_sec_lo = sec64 & 0xffffffff;
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*tv_nsec = a->tv_nsec;
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}
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/* Convert nanoseconds to timespec
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*
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* \param a timespec
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* \param b nanoseconds
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*/
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static inline void
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timespec_from_nsec(struct timespec *a, int64_t b)
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{
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a->tv_sec = b / NSEC_PER_SEC;
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a->tv_nsec = b % NSEC_PER_SEC;
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}
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/* Convert microseconds to timespec
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*
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* \param a timespec
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* \param b microseconds
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*/
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static inline void
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timespec_from_usec(struct timespec *a, int64_t b)
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{
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timespec_from_nsec(a, b * 1000);
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}
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/* Convert milliseconds to timespec
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*
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* \param a timespec
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* \param b milliseconds
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*/
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static inline void
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timespec_from_msec(struct timespec *a, int64_t b)
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{
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timespec_from_nsec(a, b * 1000000);
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}
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/* Convert protocol data to timespec
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*
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* \param a[out] timespec
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* \param tv_sec_hi the high bytes of seconds part
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* \param tv_sec_lo the low bytes of seconds part
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* \param tv_nsec the nanoseconds part
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*/
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static inline void
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timespec_from_proto(struct timespec *a, uint32_t tv_sec_hi,
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uint32_t tv_sec_lo, uint32_t tv_nsec)
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{
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a->tv_sec = ((uint64_t)tv_sec_hi << 32) + tv_sec_lo;
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a->tv_nsec = tv_nsec;
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}
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/* Check if a timespec is zero
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*
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* \param a timespec
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* \return whether the timespec is zero
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*/
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static inline bool
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timespec_is_zero(const struct timespec *a)
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{
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return a->tv_sec == 0 && a->tv_nsec == 0;
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}
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/* Check if two timespecs are equal
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*
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* \param a[in] timespec to check
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* \param b[in] timespec to check
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* \return whether timespecs a and b are equal
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*/
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static inline bool
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timespec_eq(const struct timespec *a, const struct timespec *b)
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{
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return a->tv_sec == b->tv_sec &&
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a->tv_nsec == b->tv_nsec;
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}
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/* Convert milli-Hertz to nanoseconds
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*
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* \param mhz frequency in mHz, not zero
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* \return period in nanoseconds
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*/
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static inline int64_t
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millihz_to_nsec(uint32_t mhz)
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{
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assert(mhz > 0);
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return 1000000000000LL / mhz;
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}
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#endif /* TIMESPEC_UTIL_H */
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