diff options
Diffstat (limited to 'win/tclWinTime.c')
| -rw-r--r-- | win/tclWinTime.c | 437 |
1 files changed, 430 insertions, 7 deletions
diff --git a/win/tclWinTime.c b/win/tclWinTime.c index 9cfbac0..0163723 100644 --- a/win/tclWinTime.c +++ b/win/tclWinTime.c @@ -12,6 +12,10 @@ #include "tclInt.h" +#define SECSPERDAY (60L * 60L * 24L) +#define SECSPERYEAR (SECSPERDAY * 365L) +#define SECSPER4YEAR (SECSPERYEAR * 4L + SECSPERDAY) + /* * Number of samples over which to estimate the performance counter. */ @@ -19,6 +23,25 @@ #define SAMPLES 64 /* + * The following arrays contain the day of year for the last day of each + * month, where index 1 is January. + */ + +static const int normalDays[] = { + -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 +}; + +static const int leapDays[] = { + -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 +}; + +typedef struct ThreadSpecificData { + char tzName[64]; /* Time zone name */ + struct tm tm; /* time information */ +} ThreadSpecificData; +static Tcl_ThreadDataKey dataKey; + +/* * Data for managing high-resolution timers. */ @@ -64,7 +87,7 @@ typedef struct TimeInfo { } TimeInfo; static TimeInfo timeInfo = { - { NULL, 0, 0, NULL, NULL, 0 }, + { NULL }, 0, 0, (HANDLE) NULL, @@ -90,6 +113,7 @@ static TimeInfo timeInfo = { * Declarations for functions defined later in this file. */ +static struct tm * ComputeGMT(const time_t *tp); static void StopCalibration(ClientData clientData); static DWORD WINAPI CalibrationThread(LPVOID arg); static void UpdateTimeEachSecond(void); @@ -132,7 +156,7 @@ TclpGetSeconds(void) { Tcl_Time t; - tclGetTimeProcPtr(&t, tclTimeClientData); /* Tcl_GetTime inlined. */ + (*tclGetTimeProcPtr) (&t, tclTimeClientData); /* Tcl_GetTime inlined. */ return t.sec; } @@ -166,7 +190,7 @@ TclpGetClicks(void) Tcl_Time now; /* Current Tcl time */ unsigned long retval; /* Value to return */ - tclGetTimeProcPtr(&now, tclTimeClientData); /* Tcl_GetTime inlined */ + (*tclGetTimeProcPtr) (&now, tclTimeClientData); /* Tcl_GetTime inlined */ retval = (now.sec * 1000000) + now.usec; return retval; @@ -176,6 +200,35 @@ TclpGetClicks(void) /* *---------------------------------------------------------------------- * + * TclpGetTimeZone -- + * + * Determines the current timezone. The method varies wildly between + * different Platform implementations, so its hidden in this function. + * + * Results: + * Minutes west of GMT. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +TclpGetTimeZone( + unsigned long currentTime) +{ + int timeZone; + + tzset(); + timeZone = timezone / 60; + + return timeZone; +} + +/* + *---------------------------------------------------------------------- + * * Tcl_GetTime -- * * Gets the current system time in seconds and microseconds since the @@ -199,7 +252,7 @@ void Tcl_GetTime( Tcl_Time *timePtr) /* Location to store time information. */ { - tclGetTimeProcPtr(timePtr, tclTimeClientData); + (*tclGetTimeProcPtr) (timePtr, tclTimeClientData); } /* @@ -256,7 +309,7 @@ NativeGetTime( Tcl_Time *timePtr, ClientData clientData) { - struct timeb t; + struct _timeb t; int useFtime = 1; /* Flag == TRUE if we need to fall back on * ftime rather than using the perf counter. */ @@ -361,7 +414,7 @@ NativeGetTime( WaitForSingleObject(timeInfo.readyEvent, INFINITE); CloseHandle(timeInfo.readyEvent); - Tcl_CreateExitHandler(StopCalibration, NULL); + Tcl_CreateExitHandler(StopCalibration, (ClientData) NULL); } timeInfo.initialized = TRUE; } @@ -422,7 +475,7 @@ NativeGetTime( * High resolution timer is not available. Just use ftime. */ - ftime(&t); + _ftime(&t); timePtr->sec = (long)t.time; timePtr->usec = t.millitm * 1000; } @@ -465,6 +518,314 @@ StopCalibration( /* *---------------------------------------------------------------------- * + * TclpGetTZName -- + * + * Gets the current timezone string. + * + * Results: + * Returns a pointer to a static string, or NULL on failure. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +char * +TclpGetTZName( + int dst) +{ + int len; + char *zone, *p; + TIME_ZONE_INFORMATION tz; + Tcl_Encoding encoding; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + char *name = tsdPtr->tzName; + + /* + * tzset() under Borland doesn't seem to set up tzname[] at all. + * tzset() under MSVC has the following weird observed behavior: + * First time we call "clock format [clock seconds] -format %Z -gmt 1" + * we get "GMT", but on all subsequent calls we get the current time + * ezone string, even though env(TZ) is GMT and the variable _timezone + * is 0. + */ + + name[0] = '\0'; + + zone = getenv("TZ"); + if (zone != NULL) { + /* + * TZ is of form "NST-4:30NDT", where "NST" would be the name of the + * standard time zone for this area, "-4:30" is the offset from GMT in + * hours, and "NDT is the name of the daylight savings time zone in + * this area. The offset and DST strings are optional. + */ + + len = strlen(zone); + if (len > 3) { + len = 3; + } + if (dst != 0) { + /* + * Skip the offset string and get the DST string. + */ + + p = zone + len; + p += strspn(p, "+-:0123456789"); + if (*p != '\0') { + zone = p; + len = strlen(zone); + if (len > 3) { + len = 3; + } + } + } + Tcl_ExternalToUtf(NULL, NULL, zone, len, 0, NULL, name, + sizeof(tsdPtr->tzName), NULL, NULL, NULL); + } + if (name[0] == '\0') { + if (GetTimeZoneInformation(&tz) == TIME_ZONE_ID_UNKNOWN) { + /* + * MSDN: On NT this is returned if DST is not used in the current + * TZ + */ + + dst = 0; + } + encoding = Tcl_GetEncoding(NULL, "unicode"); + Tcl_ExternalToUtf(NULL, encoding, + (char *) ((dst) ? tz.DaylightName : tz.StandardName), -1, + 0, NULL, name, sizeof(tsdPtr->tzName), NULL, NULL, NULL); + Tcl_FreeEncoding(encoding); + } + return name; +} + +/* + *---------------------------------------------------------------------- + * + * TclpGetDate -- + * + * This function converts between seconds and struct tm. If useGMT is + * true, then the returned date will be in Greenwich Mean Time (GMT). + * Otherwise, it will be in the local time zone. + * + * Results: + * Returns a static tm structure. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +struct tm * +TclpGetDate( + CONST time_t *t, + int useGMT) +{ + struct tm *tmPtr; + time_t time; + + if (!useGMT) { + tzset(); + + /* + * If we are in the valid range, let the C run-time library handle it. + * Otherwise we need to fake it. Note that this algorithm ignores + * daylight savings time before the epoch. + */ + + /* + * Hm, Borland's localtime manages to return NULL under certain + * circumstances (e.g. wintime.test, test 1.2). Nobody tests for this, + * since 'localtime' isn't supposed to do this, possibly leading to + * crashes. + * + * Patch: We only call this function if we are at least one day into + * the epoch, else we handle it ourselves (like we do for times < 0). + * H. Giese, June 2003 + */ + +#ifdef __BORLANDC__ +#define LOCALTIME_VALIDITY_BOUNDARY SECSPERDAY +#else +#define LOCALTIME_VALIDITY_BOUNDARY 0 +#endif + + if (*t >= LOCALTIME_VALIDITY_BOUNDARY) { + return TclpLocaltime(t); + } + + time = *t - timezone; + + /* + * If we aren't near to overflowing the long, just add the bias and + * use the normal calculation. Otherwise we will need to adjust the + * result at the end. + */ + + if (*t < (LONG_MAX - 2*SECSPERDAY) && *t > (LONG_MIN + 2*SECSPERDAY)) { + tmPtr = ComputeGMT(&time); + } else { + tmPtr = ComputeGMT(t); + + tzset(); + + /* + * Add the bias directly to the tm structure to avoid overflow. + * Propagate seconds overflow into minutes, hours and days. + */ + + time = tmPtr->tm_sec - timezone; + tmPtr->tm_sec = (int)(time % 60); + if (tmPtr->tm_sec < 0) { + tmPtr->tm_sec += 60; + time -= 60; + } + + time = tmPtr->tm_min + time/60; + tmPtr->tm_min = (int)(time % 60); + if (tmPtr->tm_min < 0) { + tmPtr->tm_min += 60; + time -= 60; + } + + time = tmPtr->tm_hour + time/60; + tmPtr->tm_hour = (int)(time % 24); + if (tmPtr->tm_hour < 0) { + tmPtr->tm_hour += 24; + time -= 24; + } + + time /= 24; + tmPtr->tm_mday += (int)time; + tmPtr->tm_yday += (int)time; + tmPtr->tm_wday = (tmPtr->tm_wday + (int)time) % 7; + } + } else { + tmPtr = ComputeGMT(t); + } + return tmPtr; +} + +/* + *---------------------------------------------------------------------- + * + * ComputeGMT -- + * + * This function computes GMT given the number of seconds since the epoch + * (midnight Jan 1 1970). + * + * Results: + * Returns a (per thread) statically allocated struct tm. + * + * Side effects: + * Updates the values of the static struct tm. + * + *---------------------------------------------------------------------- + */ + +static struct tm * +ComputeGMT( + const time_t *tp) +{ + struct tm *tmPtr; + long tmp, rem; + int isLeap; + const int *days; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + tmPtr = &tsdPtr->tm; + + /* + * Compute the 4 year span containing the specified time. + */ + + tmp = (long)(*tp / SECSPER4YEAR); + rem = (long)(*tp % SECSPER4YEAR); + + /* + * Correct for weird mod semantics so the remainder is always positive. + */ + + if (rem < 0) { + tmp--; + rem += SECSPER4YEAR; + } + + /* + * Compute the year after 1900 by taking the 4 year span and adjusting for + * the remainder. This works because 2000 is a leap year, and 1900/2100 + * are out of the range. + */ + + tmp = (tmp * 4) + 70; + isLeap = 0; + if (rem >= SECSPERYEAR) { /* 1971, etc. */ + tmp++; + rem -= SECSPERYEAR; + if (rem >= SECSPERYEAR) { /* 1972, etc. */ + tmp++; + rem -= SECSPERYEAR; + if (rem >= SECSPERYEAR + SECSPERDAY) { /* 1973, etc. */ + tmp++; + rem -= SECSPERYEAR + SECSPERDAY; + } else { + isLeap = 1; + } + } + } + tmPtr->tm_year = tmp; + + /* + * Compute the day of year and leave the seconds in the current day in the + * remainder. + */ + + tmPtr->tm_yday = rem / SECSPERDAY; + rem %= SECSPERDAY; + + /* + * Compute the time of day. + */ + + tmPtr->tm_hour = rem / 3600; + rem %= 3600; + tmPtr->tm_min = rem / 60; + tmPtr->tm_sec = rem % 60; + + /* + * Compute the month and day of month. + */ + + days = (isLeap) ? leapDays : normalDays; + for (tmp = 1; days[tmp] < tmPtr->tm_yday; tmp++) { + /* empty body */ + } + tmPtr->tm_mon = --tmp; + tmPtr->tm_mday = tmPtr->tm_yday - days[tmp]; + + /* + * Compute day of week. Epoch started on a Thursday. + */ + + tmPtr->tm_wday = (long)(*tp / SECSPERDAY) + 4; + if ((*tp % SECSPERDAY) < 0) { + tmPtr->tm_wday--; + } + tmPtr->tm_wday %= 7; + if (tmPtr->tm_wday < 0) { + tmPtr->tm_wday += 7; + } + + return tmPtr; +} + +/* + *---------------------------------------------------------------------- + * * CalibrationThread -- * * Thread that manages calibration of the hi-resolution time derived from @@ -792,6 +1153,68 @@ AccumulateSample( /* *---------------------------------------------------------------------- * + * TclpGmtime -- + * + * Wrapper around the 'gmtime' library function to make it thread safe. + * + * Results: + * Returns a pointer to a 'struct tm' in thread-specific data. + * + * Side effects: + * Invokes gmtime or gmtime_r as appropriate. + * + *---------------------------------------------------------------------- + */ + +struct tm * +TclpGmtime( + CONST time_t *timePtr) /* Pointer to the number of seconds since the + * local system's epoch */ +{ + /* + * The MS implementation of gmtime is thread safe because it returns the + * time in a block of thread-local storage, and Windows does not provide a + * Posix gmtime_r function. + */ + + return gmtime(timePtr); +} + +/* + *---------------------------------------------------------------------- + * + * TclpLocaltime -- + * + * Wrapper around the 'localtime' library function to make it thread + * safe. + * + * Results: + * Returns a pointer to a 'struct tm' in thread-specific data. + * + * Side effects: + * Invokes localtime or localtime_r as appropriate. + * + *---------------------------------------------------------------------- + */ + +struct tm * +TclpLocaltime( + CONST time_t *timePtr) /* Pointer to the number of seconds since the + * local system's epoch */ + +{ + /* + * The MS implementation of localtime is thread safe because it returns + * the time in a block of thread-local storage, and Windows does not + * provide a Posix localtime_r function. + */ + + return localtime(timePtr); +} + +/* + *---------------------------------------------------------------------- + * * Tcl_SetTimeProc -- * * TIP #233 (Virtualized Time): Registers two handlers for the |