diff options
Diffstat (limited to 'Python/pytime.c')
-rw-r--r-- | Python/pytime.c | 145 |
1 files changed, 60 insertions, 85 deletions
diff --git a/Python/pytime.c b/Python/pytime.c index 1f3fafb..31c8f66 100644 --- a/Python/pytime.c +++ b/Python/pytime.c @@ -3,29 +3,16 @@ #include <windows.h> #endif -#if defined(__APPLE__) && defined(HAVE_GETTIMEOFDAY) && defined(HAVE_FTIME) - /* - * _PyTime_gettimeofday falls back to ftime when getttimeofday fails because the latter - * might fail on some platforms. This fallback is unwanted on MacOSX because - * that makes it impossible to use a binary build on OSX 10.4 on earlier - * releases of the OS. Therefore claim we don't support ftime. - */ -# undef HAVE_FTIME -#endif - -#if defined(HAVE_FTIME) && !defined(MS_WINDOWS) -#include <sys/timeb.h> -extern int ftime(struct timeb *); -#endif - -static void -pygettimeofday(_PyTime_timeval *tp, _Py_clock_info_t *info) +static int +pygettimeofday(_PyTime_timeval *tp, _Py_clock_info_t *info, int raise) { #ifdef MS_WINDOWS FILETIME system_time; ULARGE_INTEGER large; ULONGLONG microseconds; + assert(info == NULL || raise); + GetSystemTimeAsFileTime(&system_time); large.u.LowPart = system_time.dwLowDateTime; large.u.HighPart = system_time.dwHighDateTime; @@ -37,55 +24,51 @@ pygettimeofday(_PyTime_timeval *tp, _Py_clock_info_t *info) tp->tv_usec = microseconds % 1000000; if (info) { DWORD timeAdjustment, timeIncrement; - BOOL isTimeAdjustmentDisabled; + BOOL isTimeAdjustmentDisabled, ok; info->implementation = "GetSystemTimeAsFileTime()"; info->monotonic = 0; - (void) GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement, - &isTimeAdjustmentDisabled); + ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement, + &isTimeAdjustmentDisabled); + if (!ok) { + PyErr_SetFromWindowsErr(0); + return -1; + } info->resolution = timeIncrement * 1e-7; info->adjustable = 1; } -#else - /* There are three ways to get the time: - (1) gettimeofday() -- resolution in microseconds - (2) ftime() -- resolution in milliseconds - (3) time() -- resolution in seconds - In all cases the return value in a timeval struct. - Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may - fail, so we fall back on ftime() or time(). - Note: clock resolution does not imply clock accuracy! */ + return 0; -#if (defined(HAVE_CLOCK_GETTIME) || defined(HAVE_GETTIMEOFDAY) \ - || defined(HAVE_FTIME)) +#else /* MS_WINDOWS */ int err; -#endif #ifdef HAVE_CLOCK_GETTIME struct timespec ts; #endif -#ifdef HAVE_FTIME - struct timeb t; -#endif - /* test clock_gettime(CLOCK_REALTIME) */ + assert(info == NULL || raise); + #ifdef HAVE_CLOCK_GETTIME - err = clock_gettime(CLOCK_REALTIME, &ts); - if (err == 0) { - if (info) { - struct timespec res; - info->implementation = "clock_gettime(CLOCK_REALTIME)"; - info->monotonic = 0; - info->adjustable = 1; - if (clock_getres(CLOCK_REALTIME, &res) == 0) - info->resolution = res.tv_sec + res.tv_nsec * 1e-9; - else - info->resolution = 1e-9; - } - tp->tv_sec = ts.tv_sec; - tp->tv_usec = ts.tv_nsec / 1000; - return; + err = clock_gettime(CLOCK_REALTIME, &ts); + if (err) { + if (raise) + PyErr_SetFromErrno(PyExc_OSError); + return -1; } -#endif + tp->tv_sec = ts.tv_sec; + tp->tv_usec = ts.tv_nsec / 1000; + + if (info) { + struct timespec res; + info->implementation = "clock_gettime(CLOCK_REALTIME)"; + info->monotonic = 0; + info->adjustable = 1; + if (clock_getres(CLOCK_REALTIME, &res) == 0) + info->resolution = res.tv_sec + res.tv_nsec * 1e-9; + else + info->resolution = 1e-9; + } + return 0; +#else /* HAVE_CLOCK_GETTIME */ /* test gettimeofday() */ #ifdef HAVE_GETTIMEOFDAY @@ -94,51 +77,39 @@ pygettimeofday(_PyTime_timeval *tp, _Py_clock_info_t *info) #else err = gettimeofday(tp, (struct timezone *)NULL); #endif - if (err == 0) { - if (info) { - info->implementation = "gettimeofday()"; - info->resolution = 1e-6; - info->monotonic = 0; - info->adjustable = 1; - } - return; + if (err) { + if (raise) + PyErr_SetFromErrno(PyExc_OSError); + return -1; } -#endif /* HAVE_GETTIMEOFDAY */ -#ifdef HAVE_FTIME - ftime(&t); - tp->tv_sec = t.time; - tp->tv_usec = t.millitm * 1000; - if (info) { - info->implementation = "ftime()"; - info->resolution = 1e-3; - info->monotonic = 0; - info->adjustable = 1; - } -#else /* !HAVE_FTIME */ - tp->tv_sec = time(NULL); - tp->tv_usec = 0; if (info) { - info->implementation = "time()"; - info->resolution = 1.0; + info->implementation = "gettimeofday()"; + info->resolution = 1e-6; info->monotonic = 0; info->adjustable = 1; } -#endif /* !HAVE_FTIME */ - -#endif /* MS_WINDOWS */ + return 0; +#endif /* HAVE_GETTIMEOFDAY */ +#endif /* !HAVE_CLOCK_GETTIME */ +#endif /* !MS_WINDOWS */ } void _PyTime_gettimeofday(_PyTime_timeval *tp) { - pygettimeofday(tp, NULL); + if (pygettimeofday(tp, NULL, 0) < 0) { + /* cannot happen, _PyTime_Init() checks that pygettimeofday() works */ + assert(0); + tp->tv_sec = 0; + tp->tv_usec = 0; + } } -void +int _PyTime_gettimeofday_info(_PyTime_timeval *tp, _Py_clock_info_t *info) { - pygettimeofday(tp, info); + return pygettimeofday(tp, info, 1); } static void @@ -273,8 +244,12 @@ _PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec, return _PyTime_ObjectToDenominator(obj, sec, usec, 1e6, round); } -void -_PyTime_Init() +int +_PyTime_Init(void) { - /* Do nothing. Needed to force linking. */ + _PyTime_timeval tv; + /* ensure that the system clock works */ + if (_PyTime_gettimeofday_info(&tv, NULL) < 0) + return -1; + return 0; } |