Merge

Lib/test/test_time.py

@@ -309,7 +309,7 @@ class TimeTestCase(unittest.TestCase):
         for t in (-2, -1, 0, 1):
             try:
                 tt = time.localtime(t)
-            except (OverflowError, ValueError):
+            except (OverflowError, OSError):
                 pass
             else:
                 self.assertEqual(time.mktime(tt), t)
@@ -345,16 +345,21 @@ class TimeTestCase(unittest.TestCase):
 
     def test_localtime_failure(self):
         # Issue #13847: check for localtime() failure
-        invalid_time_t = 2**60
+        invalid_time_t = None
+        for time_t in (-1, 2**30, 2**33, 2**60):
             try:
-            time.localtime(invalid_time_t)
+                time.localtime(time_t)
             except ValueError as err:
                 if str(err) == "timestamp out of range for platform time_t":
                     self.skipTest("need 64-bit time_t")
                 else:
                     raise
             except OSError:
-            pass
+                invalid_time_t = time_t
+                break
+        if invalid_time_t is None:
+            self.skipTest("unable to find an invalid time_t value")
+
         self.assertRaises(OSError, time.localtime, invalid_time_t)
         self.assertRaises(OSError, time.gmtime, invalid_time_t)
         self.assertRaises(OSError, time.ctime, invalid_time_t)

Misc/NEWS

@@ -463,7 +463,8 @@ Library
 
 - Issue #13847: time.localtime() and time.gmtime() now raise an OSError instead
   of ValueError on failure. time.ctime() and time.asctime() now raises an
-  OSError if localtime() failed.
+  OSError if localtime() failed. time.clock() now raises a RuntimeError if the
+  processor time used is not available or its value cannot be represented
 
 - Issue #13862: Fix spurious failure in test_zlib due to runtime/compile time
   minor versions not matching.

Modules/timemodule.c

@@ -62,6 +62,31 @@ PyDoc_STRVAR(time_doc,
 Return the current time in seconds since the Epoch.\n\
 Fractions of a second may be present if the system clock provides them.");
 
+#if defined(HAVE_CLOCK)
+
+#ifndef CLOCKS_PER_SEC
+#ifdef CLK_TCK
+#define CLOCKS_PER_SEC CLK_TCK
+#else
+#define CLOCKS_PER_SEC 1000000
+#endif
+#endif
+
+static PyObject *
+pyclock(void)
+{
+    clock_t value;
+    value = clock();
+    if (value == (clock_t)-1) {
+        PyErr_SetString(PyExc_RuntimeError,
+                "the processor time used is not available "
+                "or its value cannot be represented");
+        return NULL;
+    }
+    return PyFloat_FromDouble((double)value / CLOCKS_PER_SEC);
+}
+#endif /* HAVE_CLOCK */
+
 #if defined(MS_WINDOWS) && !defined(__BORLANDC__)
 /* Win32 has better clock replacement; we have our own version, due to Mark
    Hammond and Tim Peters */
@@ -79,8 +104,7 @@ time_clock(PyObject *self, PyObject *unused)
         if (!QueryPerformanceFrequency(&freq) || freq.QuadPart == 0) {
             /* Unlikely to happen - this works on all intel
                machines at least!  Revert to clock() */
-            return PyFloat_FromDouble(((double)clock()) /
+            return pyclock();
-                                      CLOCKS_PER_SEC);
         }
         divisor = (double)freq.QuadPart;
     }
@@ -91,18 +115,10 @@ time_clock(PyObject *self, PyObject *unused)
 
 #elif defined(HAVE_CLOCK)
 
-#ifndef CLOCKS_PER_SEC
-#ifdef CLK_TCK
-#define CLOCKS_PER_SEC CLK_TCK
-#else
-#define CLOCKS_PER_SEC 1000000
-#endif
-#endif
-
 static PyObject *
 time_clock(PyObject *self, PyObject *unused)
 {
-    return PyFloat_FromDouble(((double)clock()) / CLOCKS_PER_SEC);
+    return pyclock();
 }
 #endif /* HAVE_CLOCK */