Fix call_later to update libuv time

Author: 1st1

Makefile

@@ -15,6 +15,7 @@ clean:
 check-env:
 	python -c "import cython; (cython.__version__ < '0.24') and exit(1)"
 
+
 clean-libuv:
 	git -C vendor/libuv clean -dfX
 

tests/test_base.py

@@ -111,7 +111,7 @@ async def run():
         delta = self.loop.run_until_complete(run())
         self.assertTrue(delta > 0.049 and delta < 0.6)
 
-    def test_call_later(self):
+    def test_call_later_1(self):
         calls = []
 
         def cb(inc=10, stop=False):
@@ -142,6 +142,20 @@ def cb(inc=10, stop=False):
 
         self.assertFalse(self.loop.is_running())
 
+    def test_call_later_2(self):
+        # Test that loop.call_later triggers an update of
+        # libuv cached time.
+
+        async def main():
+            await asyncio.sleep(0.001)
+            time.sleep(0.01)
+            await asyncio.sleep(0.01)
+
+        started = time.monotonic()
+        self.loop.run_until_complete(main())
+        delta = time.monotonic() - started
+        self.assertGreater(delta, 0.019)
+
     def test_call_later_negative(self):
         calls = []
 

uvloop/handles/timer.pyx

@@ -45,6 +45,9 @@ cdef class UVTimer(UVHandle):
         self._ensure_alive()
 
         if self.running == 0:
+            # Update libuv internal time.
+            uv.uv_update_time(self._loop.uvloop)  # void
+
             err = uv.uv_timer_start(<uv.uv_timer_t*>self._handle,
                                     __uvtimer_callback,
                                     self.timeout, 0)