Raise a RuntimeError when attempting to schedule tasks in the thread pool after it has been shutdown, imitating PEP 3148 thread pool behavior

1 files changed, 1 insertions, 1 deletions

diff --git a/apscheduler/threadpool.py b/apscheduler/threadpool.py
index 8d6d7ed..8b87260 100644
--- a/apscheduler/threadpool.py
+++ b/apscheduler/threadpool.py
@@ -107,7 +107,7 @@ class ThreadPool(object):
 
     def submit(self, func, *args, **kwargs):
         if self._shutdown:
-            raise Exception('Thread pool has already been shut down')
+            raise RuntimeError('Cannot schedule new tasks after shutdown')
 
         self._queue.put((func, args, kwargs))
         self._adjust_threadcount()