Expose the clock info

Author: encukou

Lib/test/support/__init__.py

@@ -2370,21 +2370,26 @@ class CPUStopwatch:
 
     N.B.:
     - This *includes* time spent in other threads.
-    - Some systems only have a coarse 1/64 second resolution.
+    - Some systems only have a coarse resolution; check
+      stopwatch.clock_info.rseolution if.
 
     Usage:
 
     with ProcessStopwatch() as stopwatch:
         ...
     elapsed = stopwatch.seconds
+    resolution = stopwatch.clock_info.resolution
     """
     def __enter__(self):
         get_time = time.process_time
+        clock_info = time.get_clock_info('process_time')
         if get_time() <= 0:  # some platforms like WASM lack process_time()
             get_time = time.monotonic
+            clock_info = time.get_clock_info('monotonic')
         self.context = disable_gc()
         self.context.__enter__()
         self.get_time = get_time
+        self.clock_info = clock_info
         self.start_time = get_time()
         return self
 

Lib/test/test_int.py

@@ -675,7 +675,7 @@ def test_denial_of_service_prevented_int_to_str(self):
         # Ensuring that we chose a slow enough conversion to measure.
         # It takes 0.1 seconds on a Zen based cloud VM in an opt build.
         # Some OSes have a low res 1/64s timer, skip if hard to measure.
-        if sw_convert.seconds < 1/64:
+        if sw_convert.seconds < sw_convert.clock_info.resolution * 2:
             raise unittest.SkipTest('"slow" conversion took only '
                                     f'{sw_convert.seconds} seconds.')
 
@@ -714,7 +714,7 @@ def test_denial_of_service_prevented_str_to_int(self):
         # Ensuring that we chose a slow enough conversion to measure.
         # It takes 0.1 seconds on a Zen based cloud VM in an opt build.
         # Some OSes have a low res 1/64s timer, skip if hard to measure.
-        if sw_convert.seconds < 1/64:
+        if sw_convert.seconds < sw_convert.clock_info.resolution * 2:
             raise unittest.SkipTest('"slow" conversion took only '
                                     f'{sw_convert.seconds} seconds.')