diff options
Diffstat (limited to 'Lib/threading.py')
| -rw-r--r-- | Lib/threading.py | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/Lib/threading.py b/Lib/threading.py index ec955c2..e70c61b 100644 --- a/Lib/threading.py +++ b/Lib/threading.py @@ -367,6 +367,11 @@ _limbo = {} class Thread(_Verbose): __initialized = False + # Need to store a reference to sys.exc_info for printing + # out exceptions when a thread tries to use a global var. during interp. + # shutdown and thus raises an exception about trying to perform some + # operation on/with a NoneType + __exc_info = _sys.exc_info def __init__(self, group=None, target=None, name=None, args=(), kwargs={}, verbose=None): @@ -381,6 +386,9 @@ class Thread(_Verbose): self.__stopped = False self.__block = Condition(Lock()) self.__initialized = True + # sys.stderr is not stored in the class like + # sys.exc_info since it can be changed between instances + self.__stderr = _sys.stderr def _set_daemon(self): # Overridden in _MainThread and _DummyThread @@ -438,8 +446,36 @@ class Thread(_Verbose): except: if __debug__: self._note("%s.__bootstrap(): unhandled exception", self) - _sys.stderr.write("Exception in thread %s:\n%s\n" % - (self.getName(), _format_exc())) + # If sys.stderr is no more (most likely from interpreter + # shutdown) use self.__stderr. Otherwise still use sys (as in + # _sys) in case sys.stderr was redefined since the creation of + # self. + if _sys: + _sys.stderr.write("Exception in thread %s:\n%s\n" % + (self.getName(), _format_exc())) + else: + # Do the best job possible w/o a huge amt. of code to + # approximate a traceback (code ideas from + # Lib/traceback.py) + exc_type, exc_value, exc_tb = self.__exc_info() + try: + print>>self.__stderr, ( + "Exception in thread " + self.getName() + + " (most likely raised during interpreter shutdown):") + print>>self.__stderr, ( + "Traceback (most recent call last):") + while exc_tb: + print>>self.__stderr, ( + ' File "%s", line %s, in %s' % + (exc_tb.tb_frame.f_code.co_filename, + exc_tb.tb_lineno, + exc_tb.tb_frame.f_code.co_name)) + exc_tb = exc_tb.tb_next + print>>self.__stderr, ("%s: %s" % (exc_type, exc_value)) + # Make sure that exc_tb gets deleted since it is a memory + # hog; deleting everything else is just for thoroughness + finally: + del exc_type, exc_value, exc_tb else: if __debug__: self._note("%s.__bootstrap(): normal return", self) |