/* times.cc
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
- 2005, 2006, 2007, 2008, 2009, 2010 Red Hat, Inc.
+ 2005, 2006, 2007, 2008, 2009, 2010, 2011 Red Hat, Inc.
This file is part of Cygwin.
#include "cygtls.h"
#include "ntdll.h"
+/* 100ns difference between WIndows and UNIX timebase. */
#define FACTOR (0x19db1ded53e8000LL)
+/* # of 100ns intervals per second. */
#define NSPERSEC 10000000LL
+/* Max allowed diversion in 100ns of internal timer from system time. If
+ this difference is exceeded, the internal timer gets re-primed. */
+#define JITTER (40 * 10000LL)
/* TODO: Putting this variable in the shared cygwin region partially solves
the problem of cygwin processes not recognizing date changes when other
systime_ns ()
{
LARGE_INTEGER x;
- FILETIME ft;
- GetSystemTimeAsFileTime (&ft);
- x.HighPart = ft.dwHighDateTime;
- x.LowPart = ft.dwLowDateTime;
+ GetSystemTimeAsFileTime ((LPFILETIME) &x);
x.QuadPart -= FACTOR; /* Add conversion factor for UNIX vs. Windows base time */
return x.QuadPart;
}
return res;
}
-/*
- * localtime_r.c
- * Original Author: Adapted from tzcode maintained by Arthur David Olson.
- *
- * Converts the calendar time pointed to by tim_p into a broken-down time
- * expressed as local time. Returns a pointer to a structure containing the
- * broken-down time.
- */
-
-#define SECSPERMIN 60
-#define MINSPERHOUR 60
-#define HOURSPERDAY 24
-#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
-#define SECSPERDAY (SECSPERHOUR * HOURSPERDAY)
-#define DAYSPERWEEK 7
-#define MONSPERYEAR 12
-
-#define YEAR_BASE 1900
-#define EPOCH_YEAR 1970
-#define EPOCH_WDAY 4
-
-#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
-
-#if 0 /* POSIX_LOCALTIME */
-
-static _CONST int mon_lengths[2][MONSPERYEAR] = {
- {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
- {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
-};
-
-static _CONST int year_lengths[2] = {
- 365,
- 366
-};
-
-/*
- * Convert a time_t into a struct tm *.
- * Does NO timezone conversion.
- */
-
-/* Cygwin internal */
-static struct tm * __stdcall
-corelocaltime (const time_t * tim_p)
-{
- long days, rem;
- int y;
- int yleap;
- _CONST int *ip;
- struct tm &localtime_buf=_my_tls.locals.localtime_buf;
-
- time_t tim = *tim_p;
- struct tm *res = &localtime_buf;
-
- days = ((long) tim) / SECSPERDAY;
- rem = ((long) tim) % SECSPERDAY;
-
- while (rem < 0)
- {
- rem += SECSPERDAY;
- --days;
- }
- while (rem >= SECSPERDAY)
- {
- rem -= SECSPERDAY;
- ++days;
- }
-
- /* compute hour, min, and sec */
- res->tm_hour = (int) (rem / SECSPERHOUR);
- rem %= SECSPERHOUR;
- res->tm_min = (int) (rem / SECSPERMIN);
- res->tm_sec = (int) (rem % SECSPERMIN);
-
- /* compute day of week */
- if ((res->tm_wday = ((EPOCH_WDAY + days) % DAYSPERWEEK)) < 0)
- res->tm_wday += DAYSPERWEEK;
-
- /* compute year & day of year */
- y = EPOCH_YEAR;
- if (days >= 0)
- {
- for (;;)
- {
- yleap = isleap (y);
- if (days < year_lengths[yleap])
- break;
- y++;
- days -= year_lengths[yleap];
- }
- }
- else
- {
- do
- {
- --y;
- yleap = isleap (y);
- days += year_lengths[yleap];
- } while (days < 0);
- }
-
- res->tm_year = y - YEAR_BASE;
- res->tm_yday = days;
- ip = mon_lengths[yleap];
- for (res->tm_mon = 0; days >= ip[res->tm_mon]; ++res->tm_mon)
- days -= ip[res->tm_mon];
- res->tm_mday = days + 1;
-
- /* set daylight saving time flag */
- res->tm_isdst = -1;
-
- syscall_printf ("%d = corelocaltime (%x)", res, tim_p);
-
- return (res);
-}
-
-/* localtime: POSIX 8.1.1, C 4.12.3.4 */
-/*
- * localtime takes a time_t (which is in UTC)
- * and formats it into a struct tm as a local time.
- */
-extern "C" struct tm *
-localtime (const time_t *tim_p)
-{
- time_t tim = *tim_p;
- struct tm *rtm;
-
- tzset ();
-
- tim -= _timezone;
-
- rtm = corelocaltime (&tim);
-
- rtm->tm_isdst = _daylight;
-
- syscall_printf ("%x = localtime (%x)", rtm, tim_p);
-
- return rtm;
-}
-
-/* gmtime: C 4.12.3.3 */
-/*
- * gmtime takes a time_t (which is already in UTC)
- * and just puts it into a struct tm.
- */
-extern "C" struct tm *
-gmtime (const time_t *tim_p)
-{
- time_t tim = *tim_p;
-
- struct tm *rtm = corelocaltime (&tim);
- /* UTC has no daylight savings time */
- rtm->tm_isdst = 0;
-
- syscall_printf ("%x = gmtime (%x)", rtm, tim_p);
-
- return rtm;
-}
-
-#endif /* POSIX_LOCALTIME */
-
int
utimens_worker (path_conv &win32, const struct timespec *tvp)
{
return 0;
}
-/* obsolete, changed to cygwin_tzset when localtime.c was added - dj */
-extern "C" void
-cygwin_tzset ()
-{
-}
-
#define stupid_printf if (cygwin_finished_initializing) debug_printf
void
hires_ns::prime ()
LARGE_INTEGER int_time_start;
do
{
- tick_count_start = GetTickCount ()
+ tick_count_start = GetTickCount ();
do
{
int_time_start.HighPart = SharedUserData.InterruptTime.High1Time;
LONGLONG t = systime_ns ();
LONGLONG res = initime_ns + timeGetTime_ns ();
- if (res < (t - 40 * 10000LL))
+ if (llabs (res - t) > JITTER)
{
inited = false;
prime ();
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