Issue #22117: time.monotonic() now uses the new _PyTime_t API

* Add _PyTime_FromNanoseconds()
* Add _PyTime_AsSecondsDouble()
* Add unit tests for _PyTime_AsSecondsDouble()

1 files changed, 26 insertions, 0 deletions

diff --git a/Python/pytime.c b/Python/pytime.c
index 2aeeddc..a496335 100644
--- a/Python/pytime.c
+++ b/Python/pytime.c
@@ -405,6 +405,15 @@ _PyTime_overflow(void)
                     "timestamp too large to convert to C _PyTime_t");
 }
 
+_PyTime_t
+_PyTime_FromNanoseconds(PY_LONG_LONG ns)
+{
+    _PyTime_t t;
+    assert(sizeof(PY_LONG_LONG) <= sizeof(_PyTime_t));
+    t = Py_SAFE_DOWNCAST(ns, PY_LONG_LONG, _PyTime_t);
+    return t;
+}
+
 #if !defined(MS_WINDOWS) && !defined(__APPLE__)
 static int
 _PyTime_FromTimespec(_PyTime_t *tp, struct timespec *ts)
@@ -470,6 +479,17 @@ _PyTime_FromSecondsObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round)
     }
 }
 
+double
+_PyTime_AsSecondsDouble(_PyTime_t t)
+{
+    _PyTime_t sec, ns;
+    /* Divide using integers to avoid rounding issues on the integer part.
+       1e-9 cannot be stored exactly in IEEE 64-bit. */
+    sec = t / SEC_TO_NS;
+    ns = t % SEC_TO_NS;
+    return (double)sec + (double)ns * 1e-9;
+}
+
 PyObject *
 _PyTime_AsNanosecondsObject(_PyTime_t t)
 {
@@ -661,6 +681,12 @@ _PyTime_GetMonotonicClock(void)
 }
 
 int
+_PyTime_GetMonotonicClockWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)
+{
+    return pymonotonic_new(tp, info, 1);
+}
+
+int
 _PyTime_Init(void)
 {
     _PyTime_timeval tv;