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