2 * Time utility functions.
3 * Author: Paolo Molaro (<lupus@ximian.com>)
4 * Copyright (C) 2008 Novell, Inc.
7 #include <utils/mono-time.h>
11 #define MTICKS_PER_SEC 10000000
17 mono_msec_ticks (void)
19 /* GetTickCount () is reportedly monotonic */
20 return GetTickCount ();
23 /* Returns the number of 100ns ticks from unspecified time: this should be monotonic */
25 mono_100ns_ticks (void)
27 static LARGE_INTEGER freq;
28 static UINT64 start_time;
33 if (!QueryPerformanceFrequency (&freq))
34 return mono_100ns_datetime ();
35 QueryPerformanceCounter (&value);
36 start_time = value.QuadPart;
38 QueryPerformanceCounter (&value);
39 cur_time = value.QuadPart;
40 /* we use unsigned numbers and return the difference to avoid overflows */
41 return (cur_time - start_time) * (double)MTICKS_PER_SEC / freq.QuadPart;
44 /* Returns the number of 100ns ticks since Jan 1, 1601, UTC timezone */
46 mono_100ns_datetime (void)
50 if (sizeof(ft) != sizeof(FILETIME))
51 g_assert_not_reached ();
53 GetSystemTimeAsFileTime ((FILETIME*) &ft);
59 #ifdef HAVE_SYS_TIME_H
63 #if defined (HAVE_SYS_PARAM_H)
64 #include <sys/param.h>
66 #if defined(HAVE_SYS_SYSCTL_H)
67 #include <sys/sysctl.h>
70 #if defined(PLATFORM_MACOSX)
71 #include <mach/mach.h>
72 #include <mach/mach_time.h>
80 #if defined (HAVE_SYS_PARAM_H) && defined (KERN_BOOTTIME)
84 struct timeval boottime;
89 mib [1] = KERN_BOOTTIME;
91 size = sizeof(boottime);
93 if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1)
94 return (gint64)((now - boottime.tv_sec) * MTICKS_PER_SEC);
96 FILE *uptime = fopen ("/proc/uptime", "r");
99 if (fscanf (uptime, "%lf", &upt) == 1) {
100 gint64 now = mono_100ns_ticks ();
102 return now - (gint64)(upt * MTICKS_PER_SEC);
107 /* a made up uptime of 300 seconds */
108 return (gint64)300 * MTICKS_PER_SEC;
111 /* Returns the number of milliseconds from boot time: this should be monotonic */
113 mono_msec_ticks (void)
115 static gint64 boot_time = 0;
118 boot_time = get_boot_time ();
119 now = mono_100ns_ticks ();
120 /*printf ("now: %llu (boot: %llu) ticks: %llu\n", (gint64)now, (gint64)boot_time, (gint64)(now - boot_time));*/
121 return (now - boot_time)/10000;
124 /* Returns the number of 100ns ticks from unspecified time: this should be monotonic */
126 mono_100ns_ticks (void)
129 #ifdef CLOCK_MONOTONIC
130 struct timespec tspec;
131 static struct timespec tspec_freq = {0};
132 static int can_use_clock = 0;
133 if (!tspec_freq.tv_nsec) {
134 can_use_clock = clock_getres (CLOCK_MONOTONIC, &tspec_freq) == 0;
135 /*printf ("resolution: %lu.%lu\n", tspec_freq.tv_sec, tspec_freq.tv_nsec);*/
138 if (clock_gettime (CLOCK_MONOTONIC, &tspec) == 0) {
139 /*printf ("time: %lu.%lu\n", tspec.tv_sec, tspec.tv_nsec); */
140 return ((gint64)tspec.tv_sec * MTICKS_PER_SEC + tspec.tv_nsec / 100);
144 #elif defined(PLATFORM_MACOSX)
145 /* http://developer.apple.com/library/mac/#qa/qa1398/_index.html */
146 static mach_timebase_info_data_t timebase;
147 guint64 now = mach_absolute_time ();
148 if (timebase.denom == 0) {
149 mach_timebase_info (&timebase);
150 timebase.denom *= 100; /* we return 100ns ticks */
152 return now * timebase.numer / timebase.denom;
154 if (gettimeofday (&tv, NULL) == 0)
155 return ((gint64)tv.tv_sec * 1000000 + tv.tv_usec) * 10;
160 * Magic number to convert unix epoch start to windows epoch start
161 * Jan 1, 1970 into a value which is relative to Jan 1, 1601.
163 #define EPOCH_ADJUST ((guint64)11644473600LL)
165 /* Returns the number of 100ns ticks since 1/1/1601, UTC timezone */
167 mono_100ns_datetime (void)
170 if (gettimeofday (&tv, NULL) == 0)
171 return (((gint64)tv.tv_sec + EPOCH_ADJUST) * 1000000 + tv.tv_usec) * 10;