Fixed main use case

bg.py

@@ -7,6 +7,7 @@ Implement a simple parallel work class.
 # Uses low level threading.
 import sys
 import time
+
 import _thread as _t
 
 class NotReadyError(RuntimeError):
@@ -30,25 +31,27 @@ class Bg:
     def __init__(self, func, *args, **kwarg):
         assert callable(func)
         self._running = _t.allocate_lock()
-        self._tid = _t.start_new_thread(self.run, args, kwarg)
 
-    def run(self, func, args, kwarg):
-        "Acquire locks, start thread, return thread id"
+        ## Create inner function to run in a thread.
+        def _job():
+            "Run requested callable in a thread"
             self._running.acquire()
+            self.start = time.time()
             try:
                 self._result = func(*args, **kwarg)
-            self.start = time.time()
             except:
                 self._exc_info = sys.exc_info()
             finally:
-            self.finish = time.time()
                 self._running.release()
         
-    def running(self):
+        # Store the thread id in an instance variable.
+        self._tid = _t.start_new_thread(_job, ())
+
+    def is_running(self):
         "Return True if the job is still running"
         return self._running.locked()
 
-    def done(self):
+    def is_done(self):
         "Return True if the job finished running"
         return not self._running.locked()