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24 lines
606 B
Markdown
24 lines
606 B
Markdown
---
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icon: dot
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label: 'Misc'
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order: 0
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---
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## The scope lock of gc
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Sometimes you need to use the following code to prevent the gc from collecting objects.
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```cpp
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auto _lock = vm->heap.gc_scope_lock()
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```
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The scope lock is required if you create a PyObject and then try to run python-level bytecodes.
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For example, you create a temporary object on the stack and then call `vm->py_str`.
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Because users can have an overload of `__str__`, the call process is unsafe.
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When the vm is running python-level bytecodes, gc may start and delete your temporary object.
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The scope lock prevents this from happening.
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