Hub: store both type and value of exc_info; this fixes test__exc_info.py on Python2.4

gevent/core.pyx

@@ -665,8 +665,7 @@ def get_header_version():
     return levent._EVENT_VERSION
 
 
-def set_exc_info(object value):
-    cdef object typ
+def set_exc_info(object type, object value):
     cdef PyThreadState* tstate = PyThreadState_GET()
     if tstate.exc_type != NULL:
         Py_DECREF(<object>tstate.exc_type)
@@ -678,10 +677,9 @@ def set_exc_info(object value):
         tstate.exc_type = NULL
         tstate.exc_value = NULL
     else:
-        typ = type(value)
-        Py_INCREF(typ)
+        Py_INCREF(type)
         Py_INCREF(value)
-        tstate.exc_type = <void*>typ
+        tstate.exc_type = <void*>type
         tstate.exc_value = <void *>value
     tstate.exc_traceback = NULL
 

gevent/hub.py

@@ -169,7 +169,7 @@ class Hub(greenlet):
     def switch(self):
         cur = getcurrent()
         assert cur is not self, 'Impossible to call blocking function in the event loop callback'
-        exception = sys.exc_info()[1]
+        exc_type, exc_value = sys.exc_info()[:2]
         try:
             switch_out = getattr(cur, 'switch_out', None)
             if switch_out is not None:
@@ -180,7 +180,7 @@ class Hub(greenlet):
             sys.exc_clear()
             return greenlet.switch(self)
         finally:
-            core.set_exc_info(exception)
+            core.set_exc_info(exc_type, exc_value)
 
     def run(self):
         global _threadlocal