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Barry



On 8 Jul 2020, at 23:58, William Pickard <lollol222gg@gmail.com> wrote:

CPython at the very least has 2 different type of native states: Interpreter & Module state.
Unfortunately, the multi-phase initialization has a weakness when it comes to Module states.

You can't access the module state without a pointer to the module.
PyState_GetModule from a standpoint looks to be the obvious answer to use, but it's documentation states it's unfit for multi-phase initialization.

I'm proposing an idea here for discussion on a new state system for at least CPython.

Tier 1: Core state
       - This state lives within CPython's core binary and exists the entire lifetime of the binary.
       - The data held within this state is available to the main interpreter and subsequent sub-interpreters. (Example: sys.executable)

Tier 2-1: Interpreter state (Branches from Core state)
       - This state lives within CPython's core binary and is tied to a specific interpreter.
       - The data held within this state is only available to the interpreter it's tied to. (Example: Modules loaded into memory)

Tier 2-2: Extension state (Branches from Core state)
       - This state lives within any CPython's core binary EXCEPT it's size and structure is defined by the extension CPython has loaded.
       - The purpose of this state is to allow an extension to hold data that can't be tied to a specific module. (Examples can be: Windows WSA, MySQL)

Tier 3-1: Thread state (Branches from Interpreter State)
       - This state lives within CPython's core binary and is tied to a specific Python thread (IE: Threading library threads),
       - The data held within this state is only available to the thread it's tied to. (No known examples available)

Tier 3-2: Module state (Branches from Interpreter State)
       - This type of state is already available in CPython, explaining it is not required.
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