New submission from M <[email protected]>:
When using Python 2.5.4 on Windows (and potentially other versions and
platforms), usage of CTypes like the following cause a memory leak. The memory
leak can be verified with ProcessExplorer, as the memory Python takes up keeps
increasing until eventually Python will get a MemoryError.
----
import ctypes
def hi():
class c1(ctypes.Structure):
_fields_=[('f1',ctypes.c_uint8)]
class c2(ctypes.Structure):
_fields_=[('g1',c1*2)]
while True:
test=hi()
----
This is true even if the garbage collector is called explicitly:
----
import gc
import ctypes
def hi():
class c1(ctypes.Structure):
_fields_=[('f1',ctypes.c_uint8)]
class c2(ctypes.Structure):
_fields_=[('g1',c1*2)]
while True:
test=hi()
test2=gc.collect()
----
It is also true if "del" is called on the return value of the function.
In order to get the memory leak, it appears to be necessary to have two
Structure classes, with one of them containing a "multiple" of the other one as
a field.
In a code project where functions returning Structure classes similarly to this
example are being used, MemoryError has been encountered.
See: http://stackoverflow.com/users/553702/user553702
----------
components: ctypes
messages: 144170
nosy: a01
priority: normal
severity: normal
status: open
title: Memory leak with CTypes Structure
type: resource usage
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Python tracker <[email protected]>
<http://bugs.python.org/issue12998>
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