gh-110850: Use _PyDeadline_Get() in EnterNonRecursiveMutex() (#118556)

vstinner · web-flow · commit 0b7814e0b638 · 2024-05-04T09:39:58.000+02:00
Use _PyDeadline_Init() and _PyDeadline_Get() in
EnterNonRecursiveMutex() of thread_nt.h.

_PyDeadline_Get() uses the monotonic clock which is now the same as
the perf counter clock on all platforms. So this change does not
cause any behavior change. It just reuses existing helper functions.
diff --git a/Python/thread_nt.h b/Python/thread_nt.h
@@ -77,17 +77,18 @@ EnterNonRecursiveMutex(PNRMUTEX mutex, DWORD milliseconds)
         }
     } else if (milliseconds != 0) {
         /* wait at least until the deadline */
-        PyTime_t nanoseconds = (PyTime_t)milliseconds * (1000 * 1000);
-        PyTime_t deadline = _PyTime_Add(_PyTime_PerfCounterUnchecked(), nanoseconds);
+        PyTime_t timeout = (PyTime_t)milliseconds * (1000 * 1000);
+        PyTime_t deadline = _PyDeadline_Init(timeout);
         while (mutex->locked) {
-            PyTime_t microseconds = _PyTime_AsMicroseconds(nanoseconds,
-                                                            _PyTime_ROUND_TIMEOUT);
+            PyTime_t microseconds = _PyTime_AsMicroseconds(timeout,
+                                                           _PyTime_ROUND_TIMEOUT);
             if (PyCOND_TIMEDWAIT(&mutex->cv, &mutex->cs, microseconds) < 0) {
                 result = WAIT_FAILED;
                 break;
             }
-            nanoseconds = deadline - _PyTime_PerfCounterUnchecked();
-            if (nanoseconds <= 0) {
+
+            timeout = _PyDeadline_Get(deadline);
+            if (timeout <= 0) {
                 break;
             }
         }
