Round delay in call_later()

* Fixes MagicStack#233.

Author: fantix

tests/test_base.py

@@ -171,6 +171,19 @@ def cb(arg):
         self.loop.run_forever()
         self.assertEqual(calls, ['a'])
 
+    def test_call_later_rounding(self):
+        # Refs #233, call_later() and call_at() shouldn't call cb early
+
+        def cb():
+            self.loop.stop()
+
+        for i in range(16):
+            self.loop.call_later(0.000928039662539959, cb)
+            started = time.monotonic()
+            self.loop.run_forever()
+            finished = time.monotonic()
+            self.assertGreater(finished - started, 0.001)
+
     def test_call_at(self):
         if os.environ.get('TRAVIS_OS_NAME'):
             # Time seems to be really unpredictable on Travis.

uvloop/loop.pyx

@@ -1254,7 +1254,7 @@ cdef class Loop:
             # infinity for a Python application.
             delay = 3600 * 24 * 365 * 100
 
-        when = <uint64_t>(delay * 1000)
+        when = <uint64_t>round(delay * 1000)
         if not args:
             args = None
         if when == 0: