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# -*- coding: utf-8 -*-
# copyright 2018 gevent
"""
Exceptions.
.. versionadded:: 1.3b1
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
__all__ = [
'LoopExit',
]
class LoopExit(Exception):
"""
Exception thrown when the hub finishes running (`gevent.hub.Hub.run`
would return).
In a normal application, this is never thrown or caught
explicitly. The internal implementation of functions like
:meth:`gevent.hub.Hub.join` and :func:`gevent.joinall` may catch it, but user code
generally should not.
.. caution::
Errors in application programming can also lead to this exception being
raised. Some examples include (but are not limited too):
- greenlets deadlocking on a lock;
- using a socket or other gevent object with native thread
affinity from a different thread
"""
def __repr__(self):
# pylint:disable=unsubscriptable-object
if len(self.args) == 3: # From the hub
import pprint
return "%s\n\tHub: %s\n\tHandles:\n%s" % (
self.args[0], self.args[1],
pprint.pformat(self.args[2])
)
return Exception.__repr__(self)
def __str__(self):
return repr(self)
class BlockingSwitchOutError(AssertionError):
"""
Raised when a gevent synchronous function is called from a
low-level event loop callback.
This is usually a programming error.
"""
class InvalidSwitchError(AssertionError):
"""
Raised when the event loop returns control to a greenlet in an
unexpected way.
This is usually a bug in gevent, greenlet, or the event loop.
"""
class ConcurrentObjectUseError(AssertionError):
"""
Raised when an object is used (waited on) by two greenlets
independently, meaning the object was entered into a blocking
state by one greenlet and then another while still blocking in the
first one.
This is usually a programming error.
.. seealso:: `gevent.socket.wait`
"""
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