2 * Time utility functions.
3 * Author: Paolo Molaro (<lupus@ximian.com>)
4 * Copyright (C) 2008 Novell, Inc.
5 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
12 #ifdef HAVE_SYS_TIME_H
16 #include <utils/mono-time.h>
19 #define MTICKS_PER_SEC 10000000
25 mono_msec_ticks (void)
27 /* GetTickCount () is reportedly monotonic */
28 return GetTickCount ();
31 /* Returns the number of 100ns ticks from unspecified time: this should be monotonic */
33 mono_100ns_ticks (void)
35 static LARGE_INTEGER freq;
36 static UINT64 start_time;
41 if (!QueryPerformanceFrequency (&freq))
42 return mono_100ns_datetime ();
43 QueryPerformanceCounter (&value);
44 start_time = value.QuadPart;
46 QueryPerformanceCounter (&value);
47 cur_time = value.QuadPart;
48 /* we use unsigned numbers and return the difference to avoid overflows */
49 return (cur_time - start_time) * (double)MTICKS_PER_SEC / freq.QuadPart;
52 /* Returns the number of 100ns ticks since Jan 1, 1601, UTC timezone */
54 mono_100ns_datetime (void)
58 if (sizeof(ft) != sizeof(FILETIME))
59 g_assert_not_reached ();
61 GetSystemTimeAsFileTime ((FILETIME*) &ft);
68 #if defined (HAVE_SYS_PARAM_H)
69 #include <sys/param.h>
71 #if defined(HAVE_SYS_SYSCTL_H)
72 #include <sys/sysctl.h>
75 #if defined(PLATFORM_MACOSX)
76 #include <mach/mach.h>
77 #include <mach/mach_time.h>
85 #if defined (HAVE_SYS_PARAM_H) && defined (KERN_BOOTTIME)
89 struct timeval boottime;
94 mib [1] = KERN_BOOTTIME;
96 size = sizeof(boottime);
98 if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1)
99 return (gint64)((now - boottime.tv_sec) * MTICKS_PER_SEC);
101 FILE *uptime = fopen ("/proc/uptime", "r");
104 if (fscanf (uptime, "%lf", &upt) == 1) {
105 gint64 now = mono_100ns_ticks ();
107 return now - (gint64)(upt * MTICKS_PER_SEC);
112 /* a made up uptime of 300 seconds */
113 return (gint64)300 * MTICKS_PER_SEC;
116 /* Returns the number of milliseconds from boot time: this should be monotonic */
118 mono_msec_ticks (void)
120 static gint64 boot_time = 0;
123 boot_time = get_boot_time ();
124 now = mono_100ns_ticks ();
125 /*printf ("now: %llu (boot: %llu) ticks: %llu\n", (gint64)now, (gint64)boot_time, (gint64)(now - boot_time));*/
126 return (now - boot_time)/10000;
129 /* Returns the number of 100ns ticks from unspecified time: this should be monotonic */
131 mono_100ns_ticks (void)
134 #ifdef CLOCK_MONOTONIC
135 struct timespec tspec;
136 static struct timespec tspec_freq = {0};
137 static int can_use_clock = 0;
138 if (!tspec_freq.tv_nsec) {
139 can_use_clock = clock_getres (CLOCK_MONOTONIC, &tspec_freq) == 0;
140 /*printf ("resolution: %lu.%lu\n", tspec_freq.tv_sec, tspec_freq.tv_nsec);*/
143 if (clock_gettime (CLOCK_MONOTONIC, &tspec) == 0) {
144 /*printf ("time: %lu.%lu\n", tspec.tv_sec, tspec.tv_nsec); */
145 return ((gint64)tspec.tv_sec * MTICKS_PER_SEC + tspec.tv_nsec / 100);
149 #elif defined(PLATFORM_MACOSX)
150 /* http://developer.apple.com/library/mac/#qa/qa1398/_index.html */
151 static mach_timebase_info_data_t timebase;
152 guint64 now = mach_absolute_time ();
153 if (timebase.denom == 0) {
154 mach_timebase_info (&timebase);
155 timebase.denom *= 100; /* we return 100ns ticks */
157 return now * timebase.numer / timebase.denom;
159 if (gettimeofday (&tv, NULL) == 0)
160 return ((gint64)tv.tv_sec * 1000000 + tv.tv_usec) * 10;
165 * Magic number to convert unix epoch start to windows epoch start
166 * Jan 1, 1970 into a value which is relative to Jan 1, 1601.
168 #define EPOCH_ADJUST ((guint64)11644473600LL)
170 /* Returns the number of 100ns ticks since 1/1/1601, UTC timezone */
172 mono_100ns_datetime (void)
175 if (gettimeofday (&tv, NULL) == 0)
176 return mono_100ns_datetime_from_timeval (tv);
181 mono_100ns_datetime_from_timeval (struct timeval tv)
183 return (((gint64)tv.tv_sec + EPOCH_ADJUST) * 1000000 + tv.tv_usec) * 10;