src/jemalloc/src/nstime.c

   1 #include "jemalloc/internal/jemalloc_internal.h"
   2
   3 #define BILLION UINT64_C(1000000000)
   4
   5 void
   6 nstime_init(nstime_t *time, uint64_t ns)
   7 {
   8
   9         time->ns = ns;
  10 }
  11
  12 void
  13 nstime_init2(nstime_t *time, uint64_t sec, uint64_t nsec)
  14 {
  15
  16         time->ns = sec * BILLION + nsec;
  17 }
  18
  19 uint64_t
  20 nstime_ns(const nstime_t *time)
  21 {
  22
  23         return (time->ns);
  24 }
  25
  26 uint64_t
  27 nstime_sec(const nstime_t *time)
  28 {
  29
  30         return (time->ns / BILLION);
  31 }
  32
  33 uint64_t
  34 nstime_nsec(const nstime_t *time)
  35 {
  36
  37         return (time->ns % BILLION);
  38 }
  39
  40 void
  41 nstime_copy(nstime_t *time, const nstime_t *source)
  42 {
  43
  44         *time = *source;
  45 }
  46
  47 int
  48 nstime_compare(const nstime_t *a, const nstime_t *b)
  49 {
  50
  51         return ((a->ns > b->ns) - (a->ns < b->ns));
  52 }
  53
  54 void
  55 nstime_add(nstime_t *time, const nstime_t *addend)
  56 {
  57
  58         assert(UINT64_MAX - time->ns >= addend->ns);
  59
  60         time->ns += addend->ns;
  61 }
  62
  63 void
  64 nstime_subtract(nstime_t *time, const nstime_t *subtrahend)
  65 {
  66
  67         assert(nstime_compare(time, subtrahend) >= 0);
  68
  69         time->ns -= subtrahend->ns;
  70 }
  71
  72 void
  73 nstime_imultiply(nstime_t *time, uint64_t multiplier)
  74 {
  75
  76         assert((((time->ns | multiplier) & (UINT64_MAX << (sizeof(uint64_t) <<
  77             2))) == 0) || ((time->ns * multiplier) / multiplier == time->ns));
  78
  79         time->ns *= multiplier;
  80 }
  81
  82 void
  83 nstime_idivide(nstime_t *time, uint64_t divisor)
  84 {
  85
  86         assert(divisor != 0);
  87
  88         time->ns /= divisor;
  89 }
  90
  91 uint64_t
  92 nstime_divide(const nstime_t *time, const nstime_t *divisor)
  93 {
  94
  95         assert(divisor->ns != 0);
  96
  97         return (time->ns / divisor->ns);
  98 }
  99
 100 #ifdef JEMALLOC_JET
 101 #undef nstime_update
 102 #define nstime_update JEMALLOC_N(nstime_update_impl)
 103 #endif
 104 bool
 105 nstime_update(nstime_t *time)
 106 {
 107         nstime_t old_time;
 108
 109         nstime_copy(&old_time, time);
 110
 111 #ifdef _WIN32
 112         {
 113                 FILETIME ft;
 114                 uint64_t ticks;
 115                 GetSystemTimeAsFileTime(&ft);
 116                 ticks = (((uint64_t)ft.dwHighDateTime) << 32) |
 117                     ft.dwLowDateTime;
 118                 time->ns = ticks * 100;
 119         }
 120 #elif JEMALLOC_CLOCK_GETTIME
 121         {
 122                 struct timespec ts;
 123
 124                 if (sysconf(_SC_MONOTONIC_CLOCK) > 0)
 125                         clock_gettime(CLOCK_MONOTONIC, &ts);
 126                 else
 127                         clock_gettime(CLOCK_REALTIME, &ts);
 128                 time->ns = ts.tv_sec * BILLION + ts.tv_nsec;
 129         }
 130 #else
 131         struct timeval tv;
 132         gettimeofday(&tv, NULL);
 133         time->ns = tv.tv_sec * BILLION + tv.tv_usec * 1000;
 134 #endif
 135
 136         /* Handle non-monotonic clocks. */
 137         if (unlikely(nstime_compare(&old_time, time) > 0)) {
 138                 nstime_copy(time, &old_time);
 139                 return (true);
 140         }
 141
 142         return (false);
 143 }
 144 #ifdef JEMALLOC_JET
 145 #undef nstime_update
 146 #define nstime_update JEMALLOC_N(nstime_update)
 147 nstime_update_t *nstime_update = JEMALLOC_N(nstime_update_impl);
 148 #endif