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Introduce sbintime_t type -- the simplified version of struct bintime,

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using 32.32 fixed point in form of single int64_t.  It is much easier to
use in cases where additional precision and range of struct bintime is
not required.

Reviewed by:	bde (previous version), davide
This commit is contained in:
Alexander Motin 2013-02-28 10:21:04 +00:00
parent 35689395b3
commit 0f4fc79e2f
1 changed files with 85 additions and 0 deletions
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85
sys/sys/time.h
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@ -109,6 +109,37 @@ bintime_mul(struct bintime *bt, u_int x)
((a)->frac cmp (b)->frac) : \
((a)->sec cmp (b)->sec))
typedef int64_t sbintime_t;
#define SBT_1S ((sbintime_t)1 << 32)
#define SBT_1M (SBT_1S * 60)
#define SBT_1MS (SBT_1S / 1000)
#define SBT_1US (SBT_1S / 1000000)
#define SBT_1NS (SBT_1S / 1000000000)
static __inline int
sbintime_getsec(sbintime_t sbt)
{
return (sbt >> 32);
}
static __inline sbintime_t
bttosbt(const struct bintime bt)
{
return (((sbintime_t)bt.sec << 32) + (bt.frac >> 32));
}
static __inline struct bintime
sbttobt(sbintime_t sbt)
{
struct bintime bt;
bt.sec = sbt >> 32;
bt.frac = sbt << 32;
return (bt);
}
/*-
* Background information:
*
@ -156,6 +187,42 @@ timeval2bintime(const struct timeval *tv, struct bintime *bt)
/* 18446744073709 = int(2^64 / 1000000) */
bt->frac = tv->tv_usec * (uint64_t)18446744073709LL;
}
static __inline struct timespec
sbttots(sbintime_t sbt)
{
struct timespec ts;
ts.tv_sec = sbt >> 32;
ts.tv_nsec = ((uint64_t)1000000000 * (uint32_t)sbt) >> 32;
return (ts);
}
static __inline sbintime_t
tstosbt(struct timespec ts)
{
return (((sbintime_t)ts.tv_sec << 32) +
(ts.tv_nsec * (((uint64_t)1 << 63) / 500000000) >> 32));
}
static __inline struct timeval
sbttotv(sbintime_t sbt)
{
struct timeval tv;
tv.tv_sec = sbt >> 32;
tv.tv_usec = ((uint64_t)1000000 * (uint32_t)sbt) >> 32;
return (tv);
}
static __inline sbintime_t
tvtosbt(struct timeval tv)
{
return (((sbintime_t)tv.tv_sec << 32) +
(tv.tv_usec * (((uint64_t)1 << 63) / 500000) >> 32));
}
#endif /* __BSD_VISIBLE */
#ifdef _KERNEL
@ -317,6 +384,15 @@ void binuptime(struct bintime *bt);
void nanouptime(struct timespec *tsp);
void microuptime(struct timeval *tvp);
static __inline sbintime_t
sbinuptime(void)
{
struct bintime bt;
binuptime(&bt);
return (bttosbt(bt));
}
void bintime(struct bintime *bt);
void nanotime(struct timespec *tsp);
void microtime(struct timeval *tvp);
@ -325,6 +401,15 @@ void getbinuptime(struct bintime *bt);
void getnanouptime(struct timespec *tsp);
void getmicrouptime(struct timeval *tvp);
static __inline sbintime_t
getsbinuptime(void)
{
struct bintime bt;
getbinuptime(&bt);
return (bttosbt(bt));
}
void getbintime(struct bintime *bt);
void getnanotime(struct timespec *tsp);
void getmicrotime(struct timeval *tvp);