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import gc
from ..Qt import QtCore
class GarbageCollector(object):
'''
Disable automatic garbage collection and instead collect manually
on a timer.
This is done to ensure that garbage collection only happens in the GUI
thread, as otherwise Qt can crash.
Credit: Erik Janssens
Source: http://pydev.blogspot.com/2014/03/should-python-garbage-collector-be.html
'''
def __init__(self, interval=1.0, debug=False):
self.debug = debug
if debug:
gc.set_debug(gc.DEBUG_LEAK)
self.timer = QtCore.QTimer()
self.timer.timeout.connect(self.check)
self.threshold = gc.get_threshold()
gc.disable()
self.timer.start(int(interval * 1000))
def check(self):
#return self.debug_cycles() # uncomment to just debug cycles
l0, l1, l2 = gc.get_count()
if self.debug:
print('gc_check called:', l0, l1, l2)
if l0 > self.threshold[0]:
num = gc.collect(0)
if self.debug:
print('collecting gen 0, found: %d unreachable' % num)
if l1 > self.threshold[1]:
num = gc.collect(1)
if self.debug:
print('collecting gen 1, found: %d unreachable' % num)
if l2 > self.threshold[2]:
num = gc.collect(2)
if self.debug:
print('collecting gen 2, found: %d unreachable' % num)
def debug_cycles(self):
gc.collect()
for obj in gc.garbage:
print(obj, repr(obj), type(obj))
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