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