On Mar 26, 3:30 am, Nick Craig-Wood <[EMAIL PROTECTED]> wrote:
> Did anyone write a contextmanager implementing a timeout for
> python2.5?
>
> I'd love to be able to write something like
>
> with timeout(5.0) as exceeded:
> some_long_running_stuff()
> if exceeded:
> print "Oops - took too long!"
>
> And have it work reliably and in a cross platform way!
Doubt it. But you could try:
class TimeoutException(BaseException):
pass
class timeout(object):
def __init__(self, limit_t):
self.limit_t = limit
self.timer = None
self.timed_out = False
def __nonzero__(self):
return self.timed_out
def __enter__(self):
self.timer = threading.Timer(self.limit_t, ...)
self.timer.start()
return self
def __exit__(self, exc_c, exc, tb):
if exc_c is TimeoutException:
self.timed_out = True
return True # suppress exception
return False # raise exception (maybe)
where '...' is a ctypes call to raise the given exception in the
current thread (the capi call PyThreadState_SetAsyncExc)
Definitely not fool-proof, as it relies on thread switching. Also,
lock acquisition can't be interrupted, anyway. Also, this style of
programming is rather unsafe.
But I bet it would work frequently.
-Mike
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