After the variant-1 / variant-2 backend split, update remaining
string-match refs to the variant-1 backend so user-visible gates
+ skip-marks + comments name the working backend correctly:
- `tractor._root._DEBUG_COMPATIBLE_BACKENDS`: include
`main_thread_forkserver`, drop the stub-only `subint_forkserver`
entry.
- `tests/test_spawning.py::test_loglevel_propagated_to_subactor`:
capfd-skip flips to `main_thread_forkserver`.
- `tests/test_infected_asyncio.py::test_sigint_closes_lifetime_stack`:
xfail-condition flips to `main_thread_forkserver`.
- `tests/test_shm.py`: drop stale "broken on `main_thread_forkserver`"
reason-text since the `mp.SharedMemory(track=False)`
+ resource-tracker monkey-patch in `.ipc._mp_bs` makes the tests pass;
the skip-mark only fires on plain `subint` now.
- Comment / docstring sweep: `runtime._state`, `runtime._runtime`,
`_testing.pytest`, `_subint.py`, `pyproject.toml`,
`test_cancellation.py`, `test_registrar.py` — refs to variant-1
backend updated.
(this patch was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code
(cherry picked from commit 205382a39b)
(factored: dropped spawn-backend-only path: tractor/spawn/_subint.py)
New `ai/conc-anal/` doc: `mp.SharedMemory` is
fork-without-exec unsafe — child inherits parent's
`resource_tracker` fd → EBADF on first shm op;
leaked `/shm_list` cascades `FileExistsError`
across parametrize variants. Canonical CPython
issue class, NOT a tractor bug. Includes two
longer-term mitigation paths (reset inherited
tracker fd vs migrate off `mp.shared_memory`).
Also, update `tests/test_shm.py`:
- comment out `subint_forkserver` from skip list
- rewrite reason with precise failure-mode
descriptions + link to the analysis doc
(this patch was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code
(cherry picked from commit c99d475d03)
(factored: dropped spawn-backend-only paths: ai/conc-anal/subint_forkserver_mp_shared_memory_issue.md)
Adopt the `@pytest.mark.skipon_spawn_backend('subint',
reason=...)` marker (a617b521) across the suites
reproducing the `subint` GIL-contention / starvation
hang classes doc'd in `ai/conc-anal/subint_*_issue.md`.
Deats,
- Module-level `pytestmark` on full-file-hanging suites:
- `tests/test_cancellation.py`
- `tests/test_inter_peer_cancellation.py`
- `tests/test_pubsub.py`
- `tests/test_shm.py`
- Per-test decorator where only one test in the file
hangs:
- `tests/discovery/test_registrar.py
::test_stale_entry_is_deleted` — replaces the
inline `if start_method == 'subint': pytest.skip`
branch with a declarative skip.
- `tests/test_subint_cancellation.py
::test_subint_non_checkpointing_child`.
- A few per-test decorators are left commented-in-
place as breadcrumbs for later finer-grained unskips.
Also, some nearby tidying in the affected files:
- Annotate loose fixture / test params
(`pytest.FixtureRequest`, `str`, `tuple`, `bool`) in
`tests/conftest.py`, `tests/devx/conftest.py`, and
`tests/test_cancellation.py`.
- Normalize `"""..."""` → `'''...'''` docstrings per
repo convention on a few touched tests.
- Add `timeout=6` / `timeout=10` to
`@tractor_test(...)` on `test_cancel_infinite_streamer`
and `test_some_cancels_all`.
- Drop redundant `spawn_backend` param from
`test_cancel_via_SIGINT`; use `start_method` in the
`'mp' in ...` check instead.
(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code
(cherry picked from commit 4b2a0886c3)
(factored: dropped spawn-backend-only path: tests/test_subint_cancellation.py)
EventFD class now expects the fd to already be init with open_eventfd
RingBuff Sender and Receiver fully manage SharedMemory and EventFD lifecycles, no aditional ctx mngrs needed
Separate ring buf tests into its own test bed
Add parametrization to test and cancellation
Add docstrings
Add simple testing data gen module .samples
Demonstrates fixed size frame-oriented reads by the child where the
parent only transmits a "read" stream msg on "frame fill events" such
that the child incrementally reads the shm list data (much like in
a real-time-buffered streaming system).
Gud Boi
Guillermo Rodriguez
Tyler Goodlet