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Tyler Goodlet fc95c6719f Get multi-threaded sync-pausing fully workin!
The final issue was making sure we do the same thing on ctl-c/SIGINT
from the user. That is, if there's already a bg-thread in REPL, we
`log.pdb()` about SIGINT shielding and re-draw the prompt; the same UX
as normal actor-runtime-task behaviour.

Reasons this wasn't workin.. and the fix:
- `.pause_from_sync()` was overriding the local `repl` var with `None`
  delivered by (transitive) calls to `_pause(debug_func=None)`.. so
  remove all that and only assign it OAOO prior to thread-type case
  branching.
- always call `DebugStatus.shield_sigint()` as needed from all requesting
  threads/tasks:
  - in `_pause_from_bg_root_thread()` BEFORE calling `._pause()` AND BEFORE
    yielding back to the bg-thread via `.started(out)` to ensure we're
    definitely overriding the handler in the `trio`-main-thread task
    before unblocking the requesting bg-thread.
  - from any requesting bg-thread in the root actor such that both its
    main-`trio`-thread scheduled task (as per above bullet) AND it are
    SIGINT shielded.
  - always call `.shield_sigint()` BEFORE any `greenback._await()` case
    don't entirely grok why yet, but it works)?
  - for `greenback._await()` case always set `bg_task` to the current one..
- tweaks to the `SIGINT` handler, now renamed `sigint_shield()` so as
  not to name-collide with the methods when editor-searching:
  - always try to `repr()` the REPL thread/task "owner" as well as the
    active `PdbREPL` instance.
  - add `.devx()` notes around the prompt flushing deats and comments
    for any root-actor-bg-thread edge cases.

Related/supporting refinements:
- add `get_lock()`/`get_debug_req()` factory funcs since the plan is to
  eventually implement both as `@singleton` instances per actor.
- fix `acquire_debug_lock()`'s call-sig-bug for scheduling
  `request_root_stdio_lock()`..
- in `._pause()` only call `mk_pdb()` when `debug_func != None`.
- add some todo/warning notes around the `cls.repl = None` in
  `DebugStatus.release()`

`test_pause_from_sync()` tweaks:
- don't use a `attach_patts.copy()`, since we always `break` on match.
- do `pytest.fail()` on that ^ loop's fallthrough..
- pass `do_ctlc(child, patt=attach_key)` such that we always match the
  the current thread's name with the ctl-c triggered `.pdb()` emission.
- oh yeah, return the last `before: str` from `do_ctlc()`.
- in the script, flip `abandon_on_cancel=True` since when `False` it
  seems to cause `trio.run()` to hang on exit from the last bg-thread
  case?!?
2024-07-10 12:29:05 -04:00
..
advanced_faults Start a new `._testing.fault_simulation` 2024-04-03 10:19:50 -04:00
debugging Get multi-threaded sync-pausing fully workin! 2024-07-10 12:29:05 -04:00
integration Move pydantic-click hang example to new dir, skip in test suite 2022-08-02 12:16:58 -04:00
parallelism Drop now-deprecated deps on modern `trio`/Python 2024-03-13 18:41:24 -04:00
__init__.py Make example a subpkg for `python -m <mod>` testing 2022-07-27 11:40:02 -04:00
__main__.py Use trio.run() in windows tests 2021-05-07 11:21:40 -04:00
a_trynamic_first_scene.py Drop `tractor.run()` from all examples 2021-05-07 11:21:40 -04:00
actor_spawning_and_causality.py Drop `tractor.run()` from all examples 2021-05-07 11:21:40 -04:00
actor_spawning_and_causality_with_daemon.py Drop lingering rpc_module_paths refs 2021-05-07 11:21:40 -04:00
asynchronous_generators.py Terminate async gen example caller to avoid (benign) errors in console output 2021-08-02 21:49:15 -04:00
full_fledged_streaming_service.py Modernize streaming example script 2024-05-09 16:51:51 -04:00
infected_asyncio_echo_server.py Add context test that opens an inter-task-channel that errors 2022-07-14 16:13:12 -04:00
multiple_streams_one_portal.py Update all examples to new streaming API 2021-04-28 12:23:08 -04:00
quick_cluster.py Drop unecessary partial 2021-11-04 10:41:25 -04:00
remote_error_propagation.py Drop lingering rpc_module_paths refs 2021-05-07 11:21:40 -04:00
rpc_bidir_streaming.py Drop now-deprecated deps on modern `trio`/Python 2024-03-13 18:41:24 -04:00
service_discovery.py Finally implement peer-lookup optimization.. 2024-07-04 19:40:11 -04:00