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