release/src-rt-6.x/linux/linux-2.6/include/linux/time.h

   1 #ifndef _LINUX_TIME_H
   2 #define _LINUX_TIME_H
   3
   4 #ifndef __KERNEL__
   5 #include <time.h>
   6 #else
   7
   8 #include <linux/types.h>
   9
  10 #ifdef __KERNEL__
  11 # include <linux/seqlock.h>
  12 #endif
  13
  14 #ifndef _STRUCT_TIMESPEC
  15 #define _STRUCT_TIMESPEC
  16 struct timespec {
  17         time_t  tv_sec;         /* seconds */
  18         long    tv_nsec;        /* nanoseconds */
  19 };
  20 #endif
  21
  22 struct timeval {
  23         time_t          tv_sec;         /* seconds */
  24         suseconds_t     tv_usec;        /* microseconds */
  25 };
  26
  27 struct timezone {
  28         int     tz_minuteswest; /* minutes west of Greenwich */
  29         int     tz_dsttime;     /* type of dst correction */
  30 };
  31
  32 #ifdef __KERNEL__
  33
  34 /* Parameters used to convert the timespec values: */
  35 #define MSEC_PER_SEC    1000L
  36 #define USEC_PER_MSEC   1000L
  37 #define NSEC_PER_USEC   1000L
  38 #define NSEC_PER_MSEC   1000000L
  39 #define USEC_PER_SEC    1000000L
  40 #define NSEC_PER_SEC    1000000000L
  41 #define FSEC_PER_SEC    1000000000000000L
  42
  43 static inline int timespec_equal(struct timespec *a, struct timespec *b)
  44 {
  45         return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
  46 }
  47
  48 /*
  49  * lhs < rhs:  return <0
  50  * lhs == rhs: return 0
  51  * lhs > rhs:  return >0
  52  */
  53 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
  54 {
  55         if (lhs->tv_sec < rhs->tv_sec)
  56                 return -1;
  57         if (lhs->tv_sec > rhs->tv_sec)
  58                 return 1;
  59         return lhs->tv_nsec - rhs->tv_nsec;
  60 }
  61
  62 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
  63 {
  64         if (lhs->tv_sec < rhs->tv_sec)
  65                 return -1;
  66         if (lhs->tv_sec > rhs->tv_sec)
  67                 return 1;
  68         return lhs->tv_usec - rhs->tv_usec;
  69 }
  70
  71 extern unsigned long mktime(const unsigned int year, const unsigned int mon,
  72                             const unsigned int day, const unsigned int hour,
  73                             const unsigned int min, const unsigned int sec);
  74
  75 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
  76
  77 /*
  78  * sub = lhs - rhs, in normalized form
  79  */
  80 static inline struct timespec timespec_sub(struct timespec lhs,
  81                                                 struct timespec rhs)
  82 {
  83         struct timespec ts_delta;
  84         set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
  85                                 lhs.tv_nsec - rhs.tv_nsec);
  86         return ts_delta;
  87 }
  88
  89 /*
  90  * Returns true if the timespec is norm, false if denorm:
  91  */
  92 #define timespec_valid(ts) \
  93         (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
  94
  95 extern struct timespec xtime;
  96 extern struct timespec wall_to_monotonic;
  97 extern seqlock_t xtime_lock __attribute__((weak));
  98
  99 extern unsigned long read_persistent_clock(void);
 100 void timekeeping_init(void);
 101
 102 static inline unsigned long get_seconds(void)
 103 {
 104         return xtime.tv_sec;
 105 }
 106
 107 struct timespec current_kernel_time(void);
 108
 109 #define CURRENT_TIME            (current_kernel_time())
 110 #define CURRENT_TIME_SEC        ((struct timespec) { xtime.tv_sec, 0 })
 111
 112 extern void do_gettimeofday(struct timeval *tv);
 113 extern int do_settimeofday(struct timespec *tv);
 114 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
 115 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
 116 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
 117 struct itimerval;
 118 extern int do_setitimer(int which, struct itimerval *value,
 119                         struct itimerval *ovalue);
 120 extern unsigned int alarm_setitimer(unsigned int seconds);
 121 extern int do_getitimer(int which, struct itimerval *value);
 122 extern void getnstimeofday(struct timespec *tv);
 123
 124 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
 125 extern int timekeeping_is_continuous(void);
 126 extern void update_wall_time(void);
 127
 128 /**
 129  * timespec_to_ns - Convert timespec to nanoseconds
 130  * @ts:         pointer to the timespec variable to be converted
 131  *
 132  * Returns the scalar nanosecond representation of the timespec
 133  * parameter.
 134  */
 135 static inline s64 timespec_to_ns(const struct timespec *ts)
 136 {
 137         return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
 138 }
 139
 140 /**
 141  * timeval_to_ns - Convert timeval to nanoseconds
 142  * @ts:         pointer to the timeval variable to be converted
 143  *
 144  * Returns the scalar nanosecond representation of the timeval
 145  * parameter.
 146  */
 147 static inline s64 timeval_to_ns(const struct timeval *tv)
 148 {
 149         return ((s64) tv->tv_sec * NSEC_PER_SEC) +
 150                 tv->tv_usec * NSEC_PER_USEC;
 151 }
 152
 153 /**
 154  * ns_to_timespec - Convert nanoseconds to timespec
 155  * @nsec:       the nanoseconds value to be converted
 156  *
 157  * Returns the timespec representation of the nsec parameter.
 158  */
 159 extern struct timespec ns_to_timespec(const s64 nsec);
 160
 161 /**
 162  * ns_to_timeval - Convert nanoseconds to timeval
 163  * @nsec:       the nanoseconds value to be converted
 164  *
 165  * Returns the timeval representation of the nsec parameter.
 166  */
 167 extern struct timeval ns_to_timeval(const s64 nsec);
 168
 169 /**
 170  * timespec_add_ns - Adds nanoseconds to a timespec
 171  * @a:          pointer to timespec to be incremented
 172  * @ns:         unsigned nanoseconds value to be added
 173  */
 174 static inline void timespec_add_ns(struct timespec *a, u64 ns)
 175 {
 176         ns += a->tv_nsec;
 177         while(unlikely(ns >= NSEC_PER_SEC)) {
 178                 /* The following asm() prevents the compiler from
 179                  * optimising this loop into a modulo operation.  */
 180                 asm("" : "+r"(ns));
 181
 182                 ns -= NSEC_PER_SEC;
 183                 a->tv_sec++;
 184         }
 185         a->tv_nsec = ns;
 186 }
 187 #endif /* __KERNEL__ */
 188
 189 #define NFDBITS                 __NFDBITS
 190
 191 #define FD_SETSIZE              __FD_SETSIZE
 192 #define FD_SET(fd,fdsetp)       __FD_SET(fd,fdsetp)
 193 #define FD_CLR(fd,fdsetp)       __FD_CLR(fd,fdsetp)
 194 #define FD_ISSET(fd,fdsetp)     __FD_ISSET(fd,fdsetp)
 195 #define FD_ZERO(fdsetp)         __FD_ZERO(fdsetp)
 196
 197 /*
 198  * Names of the interval timers, and structure
 199  * defining a timer setting:
 200  */
 201 #define ITIMER_REAL             0
 202 #define ITIMER_VIRTUAL          1
 203 #define ITIMER_PROF             2
 204
 205 struct itimerspec {
 206         struct timespec it_interval;    /* timer period */
 207         struct timespec it_value;       /* timer expiration */
 208 };
 209
 210 struct itimerval {
 211         struct timeval it_interval;     /* timer interval */
 212         struct timeval it_value;        /* current value */
 213 };
 214
 215 /*
 216  * The IDs of the various system clocks (for POSIX.1b interval timers):
 217  */
 218 #define CLOCK_REALTIME                  0
 219 #define CLOCK_MONOTONIC                 1
 220 #define CLOCK_PROCESS_CPUTIME_ID        2
 221 #define CLOCK_THREAD_CPUTIME_ID         3
 222
 223 /*
 224  * The IDs of various hardware clocks:
 225  */
 226 #define CLOCK_SGI_CYCLE                 10
 227 #define MAX_CLOCKS                      16
 228 #define CLOCKS_MASK                     (CLOCK_REALTIME | CLOCK_MONOTONIC)
 229 #define CLOCKS_MONO                     CLOCK_MONOTONIC
 230
 231 /*
 232  * The various flags for setting POSIX.1b interval timers:
 233  */
 234 #define TIMER_ABSTIME                   0x01
 235
 236 #endif /* __KERNEL__ DEBIAN */
 237
 238 #endif