run signal handler in a separate greenlet

gevent/hub.py

@@ -83,13 +83,15 @@ def kill(greenlet, exception=GreenletExit):
         core.active_event(greenlet.throw, exception)
 
 
+def _deliver_exception_to_MAIN(g):
+    if not g.successful():
+        MAIN.throw(*g.exc_info())
+
 def signal(signalnum, handler, *args, **kwargs):
-    def deliver_exception_to_MAIN():
-        try:
-            handler(*args, **kwargs)
-        except:
-            MAIN.throw(*sys.exc_info())
-    return core.signal(signalnum, deliver_exception_to_MAIN)
+    from gevent.greenlet import Greenlet
+    def wrapper():
+        Greenlet.spawn(handler, *args, **kwargs).rawlink(_deliver_exception_to_MAIN)
+    return core.signal(signalnum, wrapper)
 
 
 if _original_fork is not None: