48 lines
1.2 KiB
Python
48 lines
1.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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If we have a run callable passed to the constructor or set as an
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attribute, but we don't actually use that (because ``__getattribute__``
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or the like interferes), then when we clear callable before beginning
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to run, there's an opportunity for Python code to run.
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"""
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import greenlet
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g = None
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main = greenlet.getcurrent()
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results = []
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class RunCallable:
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def __del__(self):
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results.append(('RunCallable', '__del__'))
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main.switch('from RunCallable')
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class G(greenlet.greenlet):
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def __getattribute__(self, name):
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if name == 'run':
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results.append(('G.__getattribute__', 'run'))
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return run_func
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return object.__getattribute__(self, name)
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def run_func():
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results.append(('run_func', 'enter'))
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g = G(RunCallable())
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# Try to start G. It will get to the point where it deletes
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# its run callable C++ variable in inner_bootstrap. That triggers
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# the __del__ method, which switches back to main before g
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# actually even starts running.
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x = g.switch()
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results.append(('main: g.switch()', x))
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# In the C++ code, this results in g->g_switch() appearing to return, even though
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# it has yet to run.
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print('In main with', x, flush=True)
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g.switch()
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print('RESULTS', results)
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