Fixed a bug with nested task scopes and deadlines. Add correctness checks to TaskPool and other minor changes

structio/abc.py

@@ -457,7 +457,7 @@ class BaseIOManager(ABC):
     """
 
     @abstractmethod
-    def wait_io(self, current_time):
+    def wait_io(self):
         """
         Waits for I/O and reschedules tasks
         when data is ready to be read/written

structio/core/context.py

@@ -151,6 +151,7 @@ class TaskPool:
                 raise exc_val.with_traceback(exc_tb)
             elif not self.done():
                 await suspend()
+                assert self.done()
             else:
                 await checkpoint()
         except Cancelled as e:

structio/core/kernel.py

@@ -271,7 +271,6 @@ class DefaultKernel(BaseKernel):
             error = TimedOut("timed out")
             error.scope = scope
             self.throw(scope.owner, error)
-            self.reschedule(scope.owner)
 
     def wakeup(self):
         while (
@@ -293,7 +292,7 @@ class DefaultKernel(BaseKernel):
         self.wakeup()
         self.check_scopes()
         if self.io_manager.pending():
-            self.io_manager.wait_io(self.clock.current_time())
+            self.io_manager.wait_io()
 
     def run(self):
         """

structio/core/managers/io/simple.py

@@ -67,16 +67,16 @@ class SimpleIOManager(BaseIOManager):
         if self._closed:
             raise structio.exceptions.ResourceClosed("the I/O manager is closed")
 
-    def wait_io(self, current_time):
+    def wait_io(self):
         self._check_closed()
         kernel: BaseKernel = current_loop()
+        current_time = kernel.clock.current_time()
         deadline = kernel.get_closest_deadline()
         if deadline == float("inf"):
             deadline = 0
         elif deadline > 0:
             deadline -= current_time
         deadline = max(0, deadline)
-        current = kernel.clock.current_time()
         readers = self._collect_readers()
         writers = self._collect_writers()
         kernel.event("before_io", deadline)
@@ -86,7 +86,7 @@ class SimpleIOManager(BaseIOManager):
             writers + readers,
             deadline,
         )
-        kernel.event("after_io", kernel.clock.current_time() - current)
+        kernel.event("after_io", kernel.clock.current_time() - current_time)
         # On Windows, a successful connection is marked
         # as an exceptional event rather than a write
         # one

structio/io/socket.py

@@ -386,14 +386,13 @@ class AsyncSocket(AsyncResource):
         if self._fd == -1:
             raise ResourceClosed("I/O operation on closed socket")
         with self.write_lock, self.read_lock:
-            connected = False
-            while not connected:
+            while True:
                 try:
                     self.socket.connect(address)
                     if self.do_handshake_on_connect:
                         await self.do_handshake()
-                    connected = True
                     await checkpoint()
+                    break
                 except WantRead:
                     await wait_readable(self._fd)
                 except WantWrite: