Module runtime 

Process-global runtime support for multiple interpreters (PEP 734 preparation).

CPython maps roughly as:

• this module ≈ _PyRuntimeState.interpreters + ID allocation
• crate::vm::PyGlobalState ≈ PyInterpreterState
• crate::VirtualMachine ≈ PyThreadState (plus shared refs to interpreter state)

Multiple crate::Interpreter instances can coexist in one process. Each owns an isolated PyGlobalState (modules, codecs, thread registry, stop-the-world, …) while sharing the process-wide crate::Context (builtin types / immortals).

Structs

InterpFeatureFlags

Feature flags copied from PyInterpreterConfig / Py_RTFLAGS_*.

InterpreterConfig

Named PyInterpreterConfig used by _interpreters.create / new_config.

InterpreterInfo

Snapshot of a registered interpreter for enumeration APIs.

Enums

InterpreterGil

InterpreterWhence

Where an interpreter state came from (mirrors CPython _PyInterpreterState_GetWhence).

Constants

MAIN_INTERPRETER_ID

Conventional id of the first process main interpreter when allocation is sequential (CPython parity). Concurrent construction may assign other ids; use PyGlobalState::is_main / crate::Interpreter::is_main to identify a main interpreter, not this constant alone.

SUPPORTS_ISOLATED_INTERPRETERS

Backs sys.implementation.supports_isolated_interpreters.

Functions

interpreter_count

Number of registered interpreters that are still alive.

list_interpreters

List all currently registered (still-alive) interpreters.

live_interpreter_states

All live interpreter states, ordered by id.

lookup_interpreter

Look up a live interpreter state by id.

main_interpreter_id

Id of the main interpreter (PEP 734 get_main()), or None before any interpreter has been created.