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island: GIL-safe entry points (PyGILState, init once, SaveThread), boxed markers #174
Description
Island GIL-safe entry points: PyGILState, init once, SaveThread, and boxed markers.
Phase P2b exit: island call from 4 threads passes, with boxed ledger tax 0 and drop_flag false.
Source: .agents/plans/2026-10-21-async-threads-design.md. Effort M.
Activity
espetro commentedon Oct 24, 2026
Already satisfied on master: ps_island.c initializes once (pthread_once), releases the GIL with PyEval_SaveThread after init, and every entry re-enters through PyGILState_Ensure/Release, with the failure paths releasing too. Receipt: tests/test_threading_stress.py::test_island_call_from_four_threads passes (island call from 4 threads), and boxed_cost.py reports tax 0 and drop_flag false. Closing; #553 and #157 build on it.