Python GC是否处理这样的参考循环? [英] Does Python GC deal with reference-cycles like this?

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问题描述

使用是默认启用的,并且应该能够释放该结构,如果没有组件可以从外面到达,而且它们没有 __ del __()方法。

<如果他们这样做,垃圾回收器释放它们 a>因为它无法确定运行这些 __ del __()方法的安全命令。


Using objgraph, I found a bunch of objects like this:

Will Python's garbage collector deal with cycles like this, or will it leak?

A slightly wider view of the loop:

解决方案

Python's standard reference counting mechanism cannot free cycles, so the structure in your example would leak.

The supplemental garbage collection facility, however, is enabled by default and should be able to free that structure, if none of its components are reachable from the outside anymore and they do not have __del__() methods.

If they do, the garbage collector will not free them because it cannot determine a safe order to run these __del__() methods.

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