Avoid forked work horse to register death of its parent worker.

rq/worker.py

@@ -49,6 +49,8 @@ class Worker(object):
         self.queues = queues
         self.validate_queues()
         self.rv_ttl = rv_ttl
+        self._state = 'starting'
+        self._is_horse = False
         self.log = Logger('worker')
 
 
@@ -93,6 +95,11 @@ class Worker(object):
         """The current process ID."""
         return os.getpid()
 
+    @property
+    def is_horse(self):
+        """Returns whether or not this is the worker or the work horse."""
+        return self._is_horse
+
     def procline(self, message):
         """Changes the current procname for the process.
 
@@ -144,6 +151,7 @@ class Worker(object):
         self.state = 'starting'
         try:
             while True:
+                self.state = 'idle'
                 self.procline('Waiting on %s' % (', '.join(self.queue_names()),))
                 wait_for_job = not quit_when_done
                 job = Queue.dequeue_any(self.queues, wait_for_job)
@@ -152,9 +160,9 @@ class Worker(object):
                 self.state = 'busy'
                 self.fork_and_perform_job(job)
                 did_work = True
-                self.state = 'idle'
         finally:
-            self.register_death()
+            if not self._is_horse:
+                self.register_death()
         return did_work
 
     def work(self):
@@ -175,6 +183,7 @@ class Worker(object):
     def fork_and_perform_job(self, job):
         child_pid = os.fork()
         if child_pid == 0:
+            self._is_horse = True
             random.seed()
             self.log = Logger('horse')
             try: