Initial Commit / Linux Combined Proof of Concept example
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deps_linux/Python-3.11.1/cpython/pytime.h
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deps_linux/Python-3.11.1/cpython/pytime.h
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// The _PyTime_t API is written to use timestamp and timeout values stored in
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// various formats and to read clocks.
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//
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// The _PyTime_t type is an integer to support directly common arithmetic
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// operations like t1 + t2.
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//
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// The _PyTime_t API supports a resolution of 1 nanosecond. The _PyTime_t type
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// is signed to support negative timestamps. The supported range is around
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// [-292.3 years; +292.3 years]. Using the Unix epoch (January 1st, 1970), the
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// supported date range is around [1677-09-21; 2262-04-11].
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//
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// Formats:
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//
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// * seconds
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// * seconds as a floating pointer number (C double)
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// * milliseconds (10^-3 seconds)
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// * microseconds (10^-6 seconds)
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// * 100 nanoseconds (10^-7 seconds)
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// * nanoseconds (10^-9 seconds)
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// * timeval structure, 1 microsecond resolution (10^-6 seconds)
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// * timespec structure, 1 nanosecond resolution (10^-9 seconds)
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//
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// Integer overflows are detected and raise OverflowError. Conversion to a
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// resolution worse than 1 nanosecond is rounded correctly with the requested
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// rounding mode. There are 4 rounding modes: floor (towards -inf), ceiling
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// (towards +inf), half even and up (away from zero).
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//
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// Some functions clamp the result in the range [_PyTime_MIN; _PyTime_MAX], so
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// the caller doesn't have to handle errors and doesn't need to hold the GIL.
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// For example, _PyTime_Add(t1, t2) computes t1+t2 and clamp the result on
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// overflow.
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//
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// Clocks:
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//
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// * System clock
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// * Monotonic clock
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// * Performance counter
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//
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// Operations like (t * k / q) with integers are implemented in a way to reduce
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// the risk of integer overflow. Such operation is used to convert a clock
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// value expressed in ticks with a frequency to _PyTime_t, like
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// QueryPerformanceCounter() with QueryPerformanceFrequency().
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#ifndef Py_LIMITED_API
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#ifndef Py_PYTIME_H
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#define Py_PYTIME_H
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/**************************************************************************
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Symbols and macros to supply platform-independent interfaces to time related
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functions and constants
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**************************************************************************/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* _PyTime_t: Python timestamp with subsecond precision. It can be used to
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store a duration, and so indirectly a date (related to another date, like
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UNIX epoch). */
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typedef int64_t _PyTime_t;
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// _PyTime_MIN nanoseconds is around -292.3 years
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#define _PyTime_MIN INT64_MIN
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// _PyTime_MAX nanoseconds is around +292.3 years
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#define _PyTime_MAX INT64_MAX
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#define _SIZEOF_PYTIME_T 8
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typedef enum {
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/* Round towards minus infinity (-inf).
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For example, used to read a clock. */
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_PyTime_ROUND_FLOOR=0,
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/* Round towards infinity (+inf).
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For example, used for timeout to wait "at least" N seconds. */
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_PyTime_ROUND_CEILING=1,
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/* Round to nearest with ties going to nearest even integer.
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For example, used to round from a Python float. */
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_PyTime_ROUND_HALF_EVEN=2,
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/* Round away from zero
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For example, used for timeout. _PyTime_ROUND_CEILING rounds
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-1e-9 to 0 milliseconds which causes bpo-31786 issue.
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_PyTime_ROUND_UP rounds -1e-9 to -1 millisecond which keeps
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the timeout sign as expected. select.poll(timeout) must block
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for negative values." */
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_PyTime_ROUND_UP=3,
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/* _PyTime_ROUND_TIMEOUT (an alias for _PyTime_ROUND_UP) should be
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used for timeouts. */
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_PyTime_ROUND_TIMEOUT = _PyTime_ROUND_UP
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} _PyTime_round_t;
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/* Convert a time_t to a PyLong. */
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PyAPI_FUNC(PyObject *) _PyLong_FromTime_t(
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time_t sec);
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/* Convert a PyLong to a time_t. */
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PyAPI_FUNC(time_t) _PyLong_AsTime_t(
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PyObject *obj);
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/* Convert a number of seconds, int or float, to time_t. */
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PyAPI_FUNC(int) _PyTime_ObjectToTime_t(
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PyObject *obj,
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time_t *sec,
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_PyTime_round_t);
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/* Convert a number of seconds, int or float, to a timeval structure.
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usec is in the range [0; 999999] and rounded towards zero.
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For example, -1.2 is converted to (-2, 800000). */
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PyAPI_FUNC(int) _PyTime_ObjectToTimeval(
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PyObject *obj,
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time_t *sec,
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long *usec,
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_PyTime_round_t);
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/* Convert a number of seconds, int or float, to a timespec structure.
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nsec is in the range [0; 999999999] and rounded towards zero.
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For example, -1.2 is converted to (-2, 800000000). */
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PyAPI_FUNC(int) _PyTime_ObjectToTimespec(
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PyObject *obj,
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time_t *sec,
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long *nsec,
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_PyTime_round_t);
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/* Create a timestamp from a number of seconds. */
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PyAPI_FUNC(_PyTime_t) _PyTime_FromSeconds(int seconds);
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/* Macro to create a timestamp from a number of seconds, no integer overflow.
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Only use the macro for small values, prefer _PyTime_FromSeconds(). */
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#define _PYTIME_FROMSECONDS(seconds) \
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((_PyTime_t)(seconds) * (1000 * 1000 * 1000))
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/* Create a timestamp from a number of nanoseconds. */
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PyAPI_FUNC(_PyTime_t) _PyTime_FromNanoseconds(_PyTime_t ns);
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/* Create a timestamp from nanoseconds (Python int). */
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PyAPI_FUNC(int) _PyTime_FromNanosecondsObject(_PyTime_t *t,
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PyObject *obj);
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/* Convert a number of seconds (Python float or int) to a timestamp.
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Raise an exception and return -1 on error, return 0 on success. */
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PyAPI_FUNC(int) _PyTime_FromSecondsObject(_PyTime_t *t,
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PyObject *obj,
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_PyTime_round_t round);
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/* Convert a number of milliseconds (Python float or int, 10^-3) to a timestamp.
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Raise an exception and return -1 on error, return 0 on success. */
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PyAPI_FUNC(int) _PyTime_FromMillisecondsObject(_PyTime_t *t,
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PyObject *obj,
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_PyTime_round_t round);
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/* Convert a timestamp to a number of seconds as a C double. */
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PyAPI_FUNC(double) _PyTime_AsSecondsDouble(_PyTime_t t);
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/* Convert timestamp to a number of milliseconds (10^-3 seconds). */
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PyAPI_FUNC(_PyTime_t) _PyTime_AsMilliseconds(_PyTime_t t,
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_PyTime_round_t round);
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/* Convert timestamp to a number of microseconds (10^-6 seconds). */
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PyAPI_FUNC(_PyTime_t) _PyTime_AsMicroseconds(_PyTime_t t,
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_PyTime_round_t round);
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/* Convert timestamp to a number of nanoseconds (10^-9 seconds). */
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PyAPI_FUNC(_PyTime_t) _PyTime_AsNanoseconds(_PyTime_t t);
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#ifdef MS_WINDOWS
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// Convert timestamp to a number of 100 nanoseconds (10^-7 seconds).
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PyAPI_FUNC(_PyTime_t) _PyTime_As100Nanoseconds(_PyTime_t t,
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_PyTime_round_t round);
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#endif
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/* Convert timestamp to a number of nanoseconds (10^-9 seconds) as a Python int
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object. */
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PyAPI_FUNC(PyObject *) _PyTime_AsNanosecondsObject(_PyTime_t t);
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#ifndef MS_WINDOWS
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/* Create a timestamp from a timeval structure.
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Raise an exception and return -1 on overflow, return 0 on success. */
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PyAPI_FUNC(int) _PyTime_FromTimeval(_PyTime_t *tp, struct timeval *tv);
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#endif
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/* Convert a timestamp to a timeval structure (microsecond resolution).
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tv_usec is always positive.
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Raise an exception and return -1 if the conversion overflowed,
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return 0 on success. */
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PyAPI_FUNC(int) _PyTime_AsTimeval(_PyTime_t t,
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struct timeval *tv,
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_PyTime_round_t round);
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/* Similar to _PyTime_AsTimeval() but don't raise an exception on overflow.
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On overflow, clamp tv_sec to _PyTime_t min/max. */
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PyAPI_FUNC(void) _PyTime_AsTimeval_clamp(_PyTime_t t,
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struct timeval *tv,
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_PyTime_round_t round);
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/* Convert a timestamp to a number of seconds (secs) and microseconds (us).
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us is always positive. This function is similar to _PyTime_AsTimeval()
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except that secs is always a time_t type, whereas the timeval structure
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uses a C long for tv_sec on Windows.
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Raise an exception and return -1 if the conversion overflowed,
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return 0 on success. */
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PyAPI_FUNC(int) _PyTime_AsTimevalTime_t(
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_PyTime_t t,
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time_t *secs,
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int *us,
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_PyTime_round_t round);
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#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_KQUEUE)
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/* Create a timestamp from a timespec structure.
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Raise an exception and return -1 on overflow, return 0 on success. */
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PyAPI_FUNC(int) _PyTime_FromTimespec(_PyTime_t *tp, struct timespec *ts);
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/* Convert a timestamp to a timespec structure (nanosecond resolution).
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tv_nsec is always positive.
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Raise an exception and return -1 on error, return 0 on success. */
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PyAPI_FUNC(int) _PyTime_AsTimespec(_PyTime_t t, struct timespec *ts);
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/* Similar to _PyTime_AsTimespec() but don't raise an exception on overflow.
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On overflow, clamp tv_sec to _PyTime_t min/max. */
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PyAPI_FUNC(void) _PyTime_AsTimespec_clamp(_PyTime_t t, struct timespec *ts);
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#endif
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// Compute t1 + t2. Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow.
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PyAPI_FUNC(_PyTime_t) _PyTime_Add(_PyTime_t t1, _PyTime_t t2);
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/* Compute ticks * mul / div.
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Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow.
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The caller must ensure that ((div - 1) * mul) cannot overflow. */
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PyAPI_FUNC(_PyTime_t) _PyTime_MulDiv(_PyTime_t ticks,
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_PyTime_t mul,
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_PyTime_t div);
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/* Structure used by time.get_clock_info() */
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typedef struct {
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const char *implementation;
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int monotonic;
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int adjustable;
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double resolution;
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} _Py_clock_info_t;
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/* Get the current time from the system clock.
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If the internal clock fails, silently ignore the error and return 0.
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On integer overflow, silently ignore the overflow and clamp the clock to
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[_PyTime_MIN; _PyTime_MAX].
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Use _PyTime_GetSystemClockWithInfo() to check for failure. */
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PyAPI_FUNC(_PyTime_t) _PyTime_GetSystemClock(void);
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/* Get the current time from the system clock.
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* On success, set *t and *info (if not NULL), and return 0.
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* On error, raise an exception and return -1.
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*/
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PyAPI_FUNC(int) _PyTime_GetSystemClockWithInfo(
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_PyTime_t *t,
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_Py_clock_info_t *info);
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/* Get the time of a monotonic clock, i.e. a clock that cannot go backwards.
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The clock is not affected by system clock updates. The reference point of
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the returned value is undefined, so that only the difference between the
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results of consecutive calls is valid.
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If the internal clock fails, silently ignore the error and return 0.
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On integer overflow, silently ignore the overflow and clamp the clock to
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[_PyTime_MIN; _PyTime_MAX].
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Use _PyTime_GetMonotonicClockWithInfo() to check for failure. */
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PyAPI_FUNC(_PyTime_t) _PyTime_GetMonotonicClock(void);
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/* Get the time of a monotonic clock, i.e. a clock that cannot go backwards.
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The clock is not affected by system clock updates. The reference point of
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the returned value is undefined, so that only the difference between the
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results of consecutive calls is valid.
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Fill info (if set) with information of the function used to get the time.
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Return 0 on success, raise an exception and return -1 on error. */
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PyAPI_FUNC(int) _PyTime_GetMonotonicClockWithInfo(
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_PyTime_t *t,
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_Py_clock_info_t *info);
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/* Converts a timestamp to the Gregorian time, using the local time zone.
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Return 0 on success, raise an exception and return -1 on error. */
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PyAPI_FUNC(int) _PyTime_localtime(time_t t, struct tm *tm);
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/* Converts a timestamp to the Gregorian time, assuming UTC.
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Return 0 on success, raise an exception and return -1 on error. */
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PyAPI_FUNC(int) _PyTime_gmtime(time_t t, struct tm *tm);
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/* Get the performance counter: clock with the highest available resolution to
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measure a short duration.
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If the internal clock fails, silently ignore the error and return 0.
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On integer overflow, silently ignore the overflow and clamp the clock to
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[_PyTime_MIN; _PyTime_MAX].
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Use _PyTime_GetPerfCounterWithInfo() to check for failure. */
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PyAPI_FUNC(_PyTime_t) _PyTime_GetPerfCounter(void);
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/* Get the performance counter: clock with the highest available resolution to
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measure a short duration.
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Fill info (if set) with information of the function used to get the time.
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Return 0 on success, raise an exception and return -1 on error. */
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PyAPI_FUNC(int) _PyTime_GetPerfCounterWithInfo(
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_PyTime_t *t,
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_Py_clock_info_t *info);
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// Create a deadline.
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// Pseudo code: _PyTime_GetMonotonicClock() + timeout.
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PyAPI_FUNC(_PyTime_t) _PyDeadline_Init(_PyTime_t timeout);
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// Get remaining time from a deadline.
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// Pseudo code: deadline - _PyTime_GetMonotonicClock().
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PyAPI_FUNC(_PyTime_t) _PyDeadline_Get(_PyTime_t deadline);
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#ifdef __cplusplus
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}
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#endif
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#endif /* Py_PYTIME_H */
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#endif /* Py_LIMITED_API */
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