Issue #21038: Use monotonic clock to compute timeout, not the system clock

Lib/test/test_epoll.py

@@ -163,9 +163,9 @@ class TestEPoll(unittest.TestCase):
         ep.register(client.fileno(),
                    select.EPOLLIN | select.EPOLLOUT | select.EPOLLET)
 
-        now = time.time()
+        now = time.monotonic()
         events = ep.poll(1, 4)
-        then = time.time()
+        then = time.monotonic()
         self.assertFalse(then - now > 0.1, then - now)
 
         events.sort()
@@ -181,9 +181,9 @@ class TestEPoll(unittest.TestCase):
         client.send(b"Hello!")
         server.send(b"world!!!")
 
-        now = time.time()
+        now = time.monotonic()
         events = ep.poll(1, 4)
-        then = time.time()
+        then = time.monotonic()
         self.assertFalse(then - now > 0.01)
 
         events.sort()
@@ -195,9 +195,9 @@ class TestEPoll(unittest.TestCase):
 
         ep.unregister(client.fileno())
         ep.modify(server.fileno(), select.EPOLLOUT)
-        now = time.time()
+        now = time.monotonic()
         events = ep.poll(1, 4)
-        then = time.time()
+        then = time.monotonic()
         self.assertFalse(then - now > 0.01)
 
         expected = [(server.fileno(), select.EPOLLOUT)]
@@ -214,9 +214,9 @@ class TestEPoll(unittest.TestCase):
         ep = select.epoll(16)
         ep.register(server)
 
-        now = time.time()
+        now = time.monotonic()
         events = ep.poll(1, 4)
-        then = time.time()
+        then = time.monotonic()
         self.assertFalse(then - now > 0.01)
 
         server.close()