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gh-74953: Add _PyTime_FromMicrosecondsClamp() function #93942

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Jun 17, 2022
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gh-74953: Add _PyTime_FromMicrosecondsClamp() function #93942

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4 changes: 4 additions & 0 deletions Include/cpython/pytime.h
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Original file line number Diff line number Diff line change
Expand Up @@ -130,6 +130,10 @@ PyAPI_FUNC(_PyTime_t) _PyTime_FromSeconds(int seconds);
/* Create a timestamp from a number of nanoseconds. */
PyAPI_FUNC(_PyTime_t) _PyTime_FromNanoseconds(_PyTime_t ns);

/* Create a timestamp from a number of microseconds.
* Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow. */
PyAPI_FUNC(_PyTime_t) _PyTime_FromMicrosecondsClamp(_PyTime_t us);

/* Create a timestamp from nanoseconds (Python int). */
PyAPI_FUNC(int) _PyTime_FromNanosecondsObject(_PyTime_t *t,
PyObject *obj);
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8 changes: 8 additions & 0 deletions Python/pytime.c
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Expand Up @@ -406,6 +406,14 @@ _PyTime_FromNanoseconds(_PyTime_t ns)
}


_PyTime_t
_PyTime_FromMicrosecondsClamp(_PyTime_t us)
{
_PyTime_t ns = _PyTime_Mul(us, US_TO_NS);
return pytime_from_nanoseconds(ns);
}


int
_PyTime_FromNanosecondsObject(_PyTime_t *tp, PyObject *obj)
{
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25 changes: 9 additions & 16 deletions Python/thread_pthread.h
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Expand Up @@ -438,22 +438,15 @@ PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds,

_PyTime_t timeout; // relative timeout
if (microseconds >= 0) {
_PyTime_t ns;
if (microseconds <= _PyTime_MAX / 1000) {
ns = microseconds * 1000;
}
else {
// bpo-41710: PyThread_acquire_lock_timed() cannot report timeout
// overflow to the caller, so clamp the timeout to
// [_PyTime_MIN, _PyTime_MAX].
//
// _PyTime_MAX nanoseconds is around 292.3 years.
//
// _thread.Lock.acquire() and _thread.RLock.acquire() raise an
// OverflowError if microseconds is greater than PY_TIMEOUT_MAX.
ns = _PyTime_MAX;
}
timeout = _PyTime_FromNanoseconds(ns);
// bpo-41710: PyThread_acquire_lock_timed() cannot report timeout
// overflow to the caller, so clamp the timeout to
// [_PyTime_MIN, _PyTime_MAX].
//
// _PyTime_MAX nanoseconds is around 292.3 years.
//
// _thread.Lock.acquire() and _thread.RLock.acquire() raise an
// OverflowError if microseconds is greater than PY_TIMEOUT_MAX.
timeout = _PyTime_FromMicrosecondsClamp(microseconds);
}
else {
timeout = _PyTime_FromNanoseconds(-1);
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