forked from goodboy/tractor
8477d21499
In an effort acquire more deterministic actor cancellation, this adds a clearer and more resilient (whilst possibly a bit slower) internal nursery structure with explicit semantics for clarifying the task-scope shutdown sequence. Namely, on cancellation, the explicit steps are now: - cancel all currently running rpc tasks and wait for them to complete - cancel the channel server and wait for it to complete - cancel the msg loop for the channel with the immediate parent - de-register with arbiter if possible - wait on remaining connections to release - exit process To accomplish this add a new nursery called the "service nursery" which spawns all rpc tasks **instead of using** the "root nursery". The root is now used solely for async launching the msg loop for the primary channel with the parent such that it is (nearly) the last thing torn down on cancellation. In the future it should also be possible to have `self.cancel()` return a result to the parent once the runtime is sure that the rest of the shutdown is atomic; this would allow for a true unbounded shield in `Portal.cancel_actor()`. This will likely require that the error handling blocks in `Actor._async_main()` are moved "inside" the root nursery block such that the msg loop with the parent truly is the last thing to terminate. |
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| .. | ||
| testing | ||
| __init__.py | ||
| _actor.py | ||
| _child.py | ||
| _discovery.py | ||
| _entry.py | ||
| _exceptions.py | ||
| _forkserver_override.py | ||
| _ipc.py | ||
| _mp_fixup_main.py | ||
| _portal.py | ||
| _spawn.py | ||
| _state.py | ||
| _streaming.py | ||
| _trionics.py | ||
| log.py | ||
| msg.py | ||