diff options
Diffstat (limited to 'include/linux/time.h')
| -rw-r--r-- | include/linux/time.h | 186 |
1 files changed, 94 insertions, 92 deletions
diff --git a/include/linux/time.h b/include/linux/time.h index 797ccd813bb00..f2aca7ec63257 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -4,7 +4,7 @@ #include <linux/types.h> #ifdef __KERNEL__ -#include <linux/seqlock.h> +# include <linux/seqlock.h> #endif #ifndef _STRUCT_TIMESPEC @@ -13,7 +13,7 @@ struct timespec { time_t tv_sec; /* seconds */ long tv_nsec; /* nanoseconds */ }; -#endif /* _STRUCT_TIMESPEC */ +#endif struct timeval { time_t tv_sec; /* seconds */ @@ -27,93 +27,103 @@ struct timezone { #ifdef __KERNEL__ -/* Parameters used to convert the timespec values */ -#define MSEC_PER_SEC (1000L) -#define USEC_PER_SEC (1000000L) -#define NSEC_PER_SEC (1000000000L) -#define NSEC_PER_USEC (1000L) +/* Parameters used to convert the timespec values: */ +#define MSEC_PER_SEC 1000L +#define USEC_PER_SEC 1000000L +#define NSEC_PER_SEC 1000000000L +#define NSEC_PER_USEC 1000L -static __inline__ int timespec_equal(struct timespec *a, struct timespec *b) -{ +static __inline__ int timespec_equal(struct timespec *a, struct timespec *b) +{ return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); -} +} -/* Converts Gregorian date to seconds since 1970-01-01 00:00:00. - * Assumes input in normal date format, i.e. 1980-12-31 23:59:59 - * => year=1980, mon=12, day=31, hour=23, min=59, sec=59. - * - * [For the Julian calendar (which was used in Russia before 1917, - * Britain & colonies before 1752, anywhere else before 1582, - * and is still in use by some communities) leave out the - * -year/100+year/400 terms, and add 10.] - * - * This algorithm was first published by Gauss (I think). - * - * WARNING: this function will overflow on 2106-02-07 06:28:16 on - * machines were long is 32-bit! (However, as time_t is signed, we - * will already get problems at other places on 2038-01-19 03:14:08) +extern unsigned long mktime(const unsigned int year, const unsigned int mon, + const unsigned int day, const unsigned int hour, + const unsigned int min, const unsigned int sec); + +extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); + +/* + * Returns true if the timespec is norm, false if denorm: */ -static inline unsigned long -mktime (unsigned int year, unsigned int mon, - unsigned int day, unsigned int hour, - unsigned int min, unsigned int sec) -{ - if (0 >= (int) (mon -= 2)) { /* 1..12 -> 11,12,1..10 */ - mon += 12; /* Puts Feb last since it has leap day */ - year -= 1; - } - - return ((( - (unsigned long) (year/4 - year/100 + year/400 + 367*mon/12 + day) + - year*365 - 719499 - )*24 + hour /* now have hours */ - )*60 + min /* now have minutes */ - )*60 + sec; /* finally seconds */ -} +#define timespec_valid(ts) \ + (((ts)->tv_sec >= 0) && (((unsigned) (ts)->tv_nsec) < NSEC_PER_SEC)) + +/* + * 64-bit nanosec type. Large enough to span 292+ years in nanosecond + * resolution. Ought to be enough for a while. + */ +typedef s64 nsec_t; extern struct timespec xtime; extern struct timespec wall_to_monotonic; extern seqlock_t xtime_lock; static inline unsigned long get_seconds(void) -{ +{ return xtime.tv_sec; } struct timespec current_kernel_time(void); -#define CURRENT_TIME (current_kernel_time()) -#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) +#define CURRENT_TIME (current_kernel_time()) +#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) extern void do_gettimeofday(struct timeval *tv); extern int do_settimeofday(struct timespec *tv); extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); -extern void clock_was_set(void); // call when ever the clock is set -extern int do_posix_clock_monotonic_gettime(struct timespec *tp); -extern long do_utimes(char __user * filename, struct timeval * times); +#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) +extern long do_utimes(char __user *filename, struct timeval *times); struct itimerval; -extern int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue); +extern int do_setitimer(int which, struct itimerval *value, + struct itimerval *ovalue); extern int do_getitimer(int which, struct itimerval *value); -extern void getnstimeofday (struct timespec *tv); -extern void getnstimestamp(struct timespec *ts); +extern void getnstimeofday(struct timespec *tv); extern struct timespec timespec_trunc(struct timespec t, unsigned gran); -static inline void -set_normalized_timespec (struct timespec *ts, time_t sec, long nsec) +/** + * timespec_to_ns - Convert timespec to nanoseconds + * @ts: pointer to the timespec variable to be converted + * + * Returns the scalar nanosecond representation of the timespec + * parameter. + */ +static inline nsec_t timespec_to_ns(const struct timespec *ts) { - while (nsec >= NSEC_PER_SEC) { - nsec -= NSEC_PER_SEC; - ++sec; - } - while (nsec < 0) { - nsec += NSEC_PER_SEC; - --sec; - } - ts->tv_sec = sec; - ts->tv_nsec = nsec; + return ((nsec_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; } +/** + * timeval_to_ns - Convert timeval to nanoseconds + * @ts: pointer to the timeval variable to be converted + * + * Returns the scalar nanosecond representation of the timeval + * parameter. + */ +static inline nsec_t timeval_to_ns(const struct timeval *tv) +{ + return ((nsec_t) tv->tv_sec * NSEC_PER_SEC) + + tv->tv_usec * NSEC_PER_USEC; +} + +/** + * ns_to_timespec - Convert nanoseconds to timespec + * @nsec: the nanoseconds value to be converted + * + * Returns the timespec representation of the nsec parameter. + */ +extern struct timespec ns_to_timespec(const nsec_t nsec); + +/** + * ns_to_timeval - Convert nanoseconds to timeval + * @nsec: the nanoseconds value to be converted + * + * Returns the timeval representation of the nsec parameter. + */ +extern struct timeval ns_to_timeval(const nsec_t nsec); + #endif /* __KERNEL__ */ #define NFDBITS __NFDBITS @@ -126,49 +136,41 @@ set_normalized_timespec (struct timespec *ts, time_t sec, long nsec) /* * Names of the interval timers, and structure - * defining a timer setting. + * defining a timer setting: */ -#define ITIMER_REAL 0 -#define ITIMER_VIRTUAL 1 -#define ITIMER_PROF 2 +#define ITIMER_REAL 0 +#define ITIMER_VIRTUAL 1 +#define ITIMER_PROF 2 -struct itimerspec { - struct timespec it_interval; /* timer period */ - struct timespec it_value; /* timer expiration */ +struct itimerspec { + struct timespec it_interval; /* timer period */ + struct timespec it_value; /* timer expiration */ }; -struct itimerval { - struct timeval it_interval; /* timer interval */ - struct timeval it_value; /* current value */ +struct itimerval { + struct timeval it_interval; /* timer interval */ + struct timeval it_value; /* current value */ }; - /* - * The IDs of the various system clocks (for POSIX.1b interval timers). + * The IDs of the various system clocks (for POSIX.1b interval timers): */ -#define CLOCK_REALTIME 0 -#define CLOCK_MONOTONIC 1 -#define CLOCK_PROCESS_CPUTIME_ID 2 -#define CLOCK_THREAD_CPUTIME_ID 3 -#define CLOCK_REALTIME_HR 4 -#define CLOCK_MONOTONIC_HR 5 +#define CLOCK_REALTIME 0 +#define CLOCK_MONOTONIC 1 +#define CLOCK_PROCESS_CPUTIME_ID 2 +#define CLOCK_THREAD_CPUTIME_ID 3 /* - * The IDs of various hardware clocks + * The IDs of various hardware clocks: */ - - -#define CLOCK_SGI_CYCLE 10 -#define MAX_CLOCKS 16 -#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC | \ - CLOCK_REALTIME_HR | CLOCK_MONOTONIC_HR) -#define CLOCKS_MONO (CLOCK_MONOTONIC & CLOCK_MONOTONIC_HR) +#define CLOCK_SGI_CYCLE 10 +#define MAX_CLOCKS 16 +#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) +#define CLOCKS_MONO CLOCK_MONOTONIC /* - * The various flags for setting POSIX.1b interval timers. + * The various flags for setting POSIX.1b interval timers: */ - -#define TIMER_ABSTIME 0x01 - +#define TIMER_ABSTIME 0x01 #endif |