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/*
* udelay.h -- udelay and other time related functions.
*
* Copyright (C) 2006, 2007 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author(s): Peter Jones <pjones@redhat.com>
*/
#ifndef UDELAY_H
#define UDELAY_H 1
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <time.h>
#define USECS_PER_SEC 1000000LL
#define NSECS_PER_USEC 1000LL
#define NSECS_PER_SEC (NSECS_PER_USEC * USECS_PER_SEC)
static inline void
nsectospec(long long nsecs, struct timespec *ts)
{
if (nsecs < 0) {
ts->tv_sec = -1;
ts->tv_nsec = -1;
return;
}
ts->tv_sec = nsecs / NSECS_PER_SEC;
ts->tv_nsec = (nsecs % NSECS_PER_SEC);
}
static inline void
usectospec(long long usecs, struct timespec *ts)
{
if (usecs > 0 && LLONG_MAX / NSECS_PER_USEC > usecs)
usecs *= NSECS_PER_USEC;
nsectospec(usecs, ts);
}
static inline int
speczero(struct timespec *ts)
{
return (ts->tv_sec == 0 && ts->tv_nsec == 0);
}
static inline int
specinf(struct timespec *ts)
{
return (ts->tv_sec < 0 || ts->tv_nsec < 0);
}
static inline long long
spectonsec(struct timespec *ts)
{
long long nsecs = 0;
if (specinf(ts))
return -1;
nsecs = ts->tv_sec * NSECS_PER_SEC;
nsecs += ts->tv_nsec;
return nsecs;
}
static inline long long
spectousec(struct timespec *ts)
{
long long usecs = spectonsec(ts);
return usecs < 0 ? usecs : usecs / NSECS_PER_USEC;
}
static inline int
gettimespecofday(struct timespec *ts)
{
struct timeval tv = {0, 0};
int rc;
rc = gettimeofday(&tv, NULL);
if (rc >= 0) {
ts->tv_sec = tv.tv_sec;
ts->tv_nsec = tv.tv_usec * NSECS_PER_USEC;
}
return rc;
}
/* minuend minus subtrahend equals difference */
static inline void
tssub(struct timespec *minuend, struct timespec *subtrahend,
struct timespec *difference)
{
long long m, s, d;
m = spectonsec(minuend);
s = spectonsec(subtrahend);
if (s < 0) {
d = 0;
} else if (m < 0) {
d = -1;
} else {
m -= s;
d = m < 0 ? 0 : m;
}
nsectospec(d, difference);
return;
}
static inline void
tsadd(struct timespec *augend, struct timespec *addend, struct timespec *sum)
{
long long aug, add;
aug = spectonsec(augend);
add = spectonsec(addend);
// printf("aug: %Ld add: %Ld\n", aug, add);
if (aug < 0 || add < 0)
nsectospec(-1, sum);
else if (LLONG_MAX - MAX(add,aug) < MAX(add,aug))
nsectospec(LLONG_MAX, sum);
else
nsectospec(aug+add, sum);
return;
}
#define tsGT(x,y) (tscmp((x), (y)) < 0)
#define tsGE(x,y) (tscmp((x), (y)) <= 0)
#define tsET(x,y) (tscmp((x), (y)) == 0)
#define tsNE(x,y) (tscmp((x), (y)) != 0)
#define tsLE(x,y) (tscmp((x), (y)) >= 0)
#define tsLT(x,y) (tscmp((x), (y)) > 0)
static inline int
tscmp(struct timespec *a, struct timespec *b)
{
long long m, s;
long long rc;
m = spectonsec(a);
s = spectonsec(b);
if (s < 0) {
rc = 1;
if (m < 0)
rc = 0;
} else if (m < 0) {
rc = -1;
} else {
rc = MIN(MAX(s-m, -1), 1);
}
return rc;
}
static inline void
udelayspec(struct timespec total)
{
struct timespec rem;
if (specinf(&total)) {
do {
usectospec(LLONG_MAX, &rem);
} while (nanosleep(&rem, &rem) == -1 && errno == EINTR);
} else {
rem = total;
while (nanosleep(&rem, &rem) == -1 && errno == EINTR)
;
}
}
static inline void
udelay(long long usecs)
{
struct timespec rem = {0,0};
usectospec(usecs, &rem);
udelayspec(rem);
}
#endif /* UDELAY_H */
/*
* vim:ts=8:sw=4:sts=4:et
*/
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