Fix minor issues

structio/core/kernels/fifo.py

@@ -209,6 +209,7 @@ class FIFOKernel(BaseKernel):
     def throw(self, task: Task, err: BaseException):
         if task.done():
             return
+        self.release(task)
         self.handle_errors(partial(task.coroutine.throw, err), task)
 
     def reschedule(self, task: Task):

structio/thread.py

@@ -310,6 +310,7 @@ async def run_in_worker(
                 # about our merry way, hoping the thread dies eventually I guess
                 daemon=cancellable,
             ).start()
+            # Ensure we get poked by the worker thread
             await wakeup2.reader.receive(1)
             # Wait for the thread to terminate
             await terminate.wait()