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Commitbc61315

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bpo-31249: Fix ref cycle in ThreadPoolExecutor (#3178)
*bpo-31249: Fix ref cycle in ThreadPoolExecutorconcurrent.futures: WorkItem.run() used by ThreadPoolExecutor nowbreaks a reference cycle between an exception object and the WorkItemobject. ThreadPoolExecutor.shutdown() now also clears its threadsset.* shutdown() now only clears threads if wait is true.* Revert changes on shutdown()
1 parent5fe59f8 commitbc61315

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+6
-2
lines changed

2 files changed

+6
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‎Lib/concurrent/futures/thread.py‎

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Original file line numberDiff line numberDiff line change
@@ -54,8 +54,10 @@ def run(self):
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try:
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result=self.fn(*self.args,**self.kwargs)
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exceptBaseExceptionase:
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self.future.set_exception(e)
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exceptBaseExceptionasexc:
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self.future.set_exception(exc)
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# Break a reference cycle with the exception 'exc'
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self=None
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else:
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self.future.set_result(result)
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@@ -0,0 +1,2 @@
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concurrent.futures: WorkItem.run() used by ThreadPoolExecutor now breaks a
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reference cycle between an exception object and the WorkItem object.

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