Handle cpython builds with `libedit` for `readline`

Since `uv`'s cpython distributions are built this way `pdbp`'s tab
completion was breaking (as was vi-mode). This adds a new
`.devx._enable_readline_feats()` import hook which checks for the
appropriate library and applies settings accordingly.

tests/conftest.py

@@ -150,6 +150,18 @@ def pytest_generate_tests(metafunc):
         metafunc.parametrize("start_method", [spawn_backend], scope='module')
 
 
+# TODO: a way to let test scripts (like from `examples/`)
+# guarantee they won't registry addr collide!
+# @pytest.fixture
+# def open_test_runtime(
+#     reg_addr: tuple,
+# ) -> AsyncContextManager:
+#     return partial(
+#         tractor.open_nursery,
+#         registry_addrs=[reg_addr],
+#     )
+
+
 def sig_prog(proc, sig):
     "Kill the actor-process with ``sig``."
     proc.send_signal(sig)

tests/devx/test_pause_from_non_trio.py

@@ -218,10 +218,9 @@ def expect_any_of(
         )
 
     return expected_patts
-    # yield child
 
 
-def test_pause_from_asyncio_task(
+def test_sync_pause_from_aio_task(
     spawn,
     ctlc: bool
     # ^TODO, fix for `asyncio`!!
@@ -327,3 +326,25 @@ def test_pause_from_asyncio_task(
 
     child.sendline('c')
     child.expect(EOF)
+
+
+def test_sync_pause_from_non_greenbacked_aio_task():
+    '''
+    Where the `breakpoint()` caller task is NOT spawned by
+    `tractor.to_asyncio` and thus never activates
+    a `greenback.ensure_portal()` beforehand, presumably bc the task
+    was started by some lib/dep as in often seen in the field.
+
+    Ensure sync pausing works when the pause is in,
+
+    - the root actor running in infected-mode?
+      |_ since we don't need any IPC to acquire the debug lock?
+      |_ is there some way to handle this like the non-main-thread case?
+
+    All other cases need to error out appropriately right?
+
+    - for any subactor we can't avoid needing the repl lock..
+      |_ is there a way to hook into `asyncio.ensure_future(obj)`?
+
+    '''
+    pass

tractor/_context.py

@@ -47,9 +47,6 @@ from functools import partial
 import inspect
 from pprint import pformat
 import textwrap
-from types import (
-    UnionType,
-)
 from typing import (
     Any,
     AsyncGenerator,
@@ -2547,14 +2544,7 @@ def context(
     name: str
     param: Type
     for name, param in annots.items():
-        if (
-            param is Context
-            or (
-                isinstance(param, UnionType)
-                and
-                Context in param.__args__
-            )
-        ):
+        if param is Context:
             ctx_var_name: str = name
             break
     else:

tractor/hilevel/__init__.py

@@ -1,26 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2024-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-High level design patterns, APIs and runtime extensions built on top
-of the `tractor` runtime core.
-
-'''
-from ._service import (
-    open_service_mngr as open_service_mngr,
-    get_service_mngr as get_service_mngr,
-    ServiceMngr as ServiceMngr,
-)

tractor/hilevel/_service.py

@@ -1,592 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2024-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-Daemon subactor as service(s) management and supervision primitives
-and API.
-
-'''
-from __future__ import annotations
-from contextlib import (
-    asynccontextmanager as acm,
-    # contextmanager as cm,
-)
-from collections import defaultdict
-from dataclasses import (
-    dataclass,
-    field,
-)
-import functools
-import inspect
-from typing import (
-    Callable,
-    Any,
-)
-
-import tractor
-import trio
-from trio import TaskStatus
-from tractor import (
-    log,
-    ActorNursery,
-    current_actor,
-    ContextCancelled,
-    Context,
-    Portal,
-)
-
-log = log.get_logger('tractor')
-
-
-# TODO: implement a `@singleton` deco-API for wrapping the below
-# factory's impl for general actor-singleton use?
-#
-# -[ ] go through the options peeps on SO did?
-#  * https://stackoverflow.com/questions/6760685/what-is-the-best-way-of-implementing-singleton-in-python
-#  * including @mikenerone's answer
-#   |_https://stackoverflow.com/questions/6760685/what-is-the-best-way-of-implementing-singleton-in-python/39186313#39186313
-#
-# -[ ] put it in `tractor.lowlevel._globals` ?
-#  * fits with our oustanding actor-local/global feat req?
-#   |_ https://github.com/goodboy/tractor/issues/55
-#  * how can it relate to the `Actor.lifetime_stack` that was
-#    silently patched in?
-#   |_ we could implicitly call both of these in the same
-#     spot in the runtime using the lifetime stack?
-#    - `open_singleton_cm().__exit__()`
-#    -`del_singleton()`
-#   |_ gives SC fixtue semantics to sync code oriented around
-#     sub-process lifetime?
-#  * what about with `trio.RunVar`?
-#   |_https://trio.readthedocs.io/en/stable/reference-lowlevel.html#trio.lowlevel.RunVar
-#    - which we'll need for no-GIL cpython (right?) presuming
-#      multiple `trio.run()` calls in process?
-#
-#
-# @singleton
-# async def open_service_mngr(
-#     **init_kwargs,
-# ) -> ServiceMngr:
-#     '''
-#     Note this function body is invoke IFF no existing singleton instance already
-#     exists in this proc's memory.
-
-#     '''
-#     # setup
-#     yield ServiceMngr(**init_kwargs)
-#     # teardown
-
-
-# a deletion API for explicit instance de-allocation?
-# @open_service_mngr.deleter
-# def del_service_mngr() -> None:
-#     mngr = open_service_mngr._singleton[0]
-#     open_service_mngr._singleton[0] = None
-#     del mngr
-
-
-
-# TODO: implement a singleton deco-API for wrapping the below
-# factory's impl for general actor-singleton use?
-#
-# @singleton
-# async def open_service_mngr(
-#     **init_kwargs,
-# ) -> ServiceMngr:
-#     '''
-#     Note this function body is invoke IFF no existing singleton instance already
-#     exists in this proc's memory.
-
-#     '''
-#     # setup
-#     yield ServiceMngr(**init_kwargs)
-#     # teardown
-
-
-
-# TODO: singleton factory API instead of a class API
-@acm
-async def open_service_mngr(
-    *,
-    debug_mode: bool = False,
-
-    # NOTE; since default values for keyword-args are effectively
-    # module-vars/globals as per the note from,
-    # https://docs.python.org/3/tutorial/controlflow.html#default-argument-values
-    #
-    # > "The default value is evaluated only once. This makes
-    #   a difference when the default is a mutable object such as
-    #   a list, dictionary, or instances of most classes"
-    #
-    _singleton: list[ServiceMngr|None] = [None],
-    **init_kwargs,
-
-) -> ServiceMngr:
-    '''
-    Open an actor-global "service-manager" for supervising a tree
-    of subactors and/or actor-global tasks.
-
-    The delivered `ServiceMngr` is singleton instance for each
-    actor-process, that is, allocated on first open and never
-    de-allocated unless explicitly deleted by al call to
-    `del_service_mngr()`.
-
-    '''
-    # TODO: factor this an allocation into
-    # a `._mngr.open_service_mngr()` and put in the
-    # once-n-only-once setup/`.__aenter__()` part!
-    # -[ ] how to make this only happen on the `mngr == None` case?
-    #  |_ use `.trionics.maybe_open_context()` (for generic
-    #     async-with-style-only-once of the factory impl, though
-    #     what do we do for the allocation case?
-    #    / `.maybe_open_nursery()` (since for this specific case
-    #    it's simpler?) to activate
-    async with (
-        tractor.open_nursery() as an,
-        trio.open_nursery() as tn,
-    ):
-        # impl specific obvi..
-        init_kwargs.update({
-            'an': an,
-            'tn': tn,
-        })
-
-        mngr: ServiceMngr|None
-        if (mngr := _singleton[0]) is None:
-
-            log.info('Allocating a new service mngr!')
-            mngr = _singleton[0] = ServiceMngr(**init_kwargs)
-
-            # TODO: put into `.__aenter__()` section of
-            # eventual `@singleton_acm` API wrapper.
-            #
-            # assign globally for future daemon/task creation
-            mngr.an = an
-            mngr.tn = tn
-
-        else:
-            assert (mngr.an and mngr.tn)
-            log.info(
-                'Using extant service mngr!\n\n'
-                f'{mngr!r}\n'  # it has a nice `.__repr__()` of services state
-            )
-
-        try:
-            # NOTE: this is a singleton factory impl specific detail
-            # which should be supported in the condensed
-            # `@singleton_acm` API?
-            mngr.debug_mode = debug_mode
-
-            yield mngr
-        finally:
-            # TODO: is this more clever/efficient?
-            # if 'samplerd' in mngr.service_ctxs:
-            #     await mngr.cancel_service('samplerd')
-            tn.cancel_scope.cancel()
-
-
-
-def get_service_mngr() -> ServiceMngr:
-    '''
-    Try to get the singleton service-mngr for this actor presuming it
-    has already been allocated using,
-
-    .. code:: python
-
-        async with open_<@singleton_acm(func)>() as mngr`
-            ... this block kept open ...
-
-    If not yet allocated raise a `ServiceError`.
-
-    '''
-    # https://stackoverflow.com/a/12627202
-    # https://docs.python.org/3/library/inspect.html#inspect.Signature
-    maybe_mngr: ServiceMngr|None = inspect.signature(
-        open_service_mngr
-    ).parameters['_singleton'].default[0]
-
-    if maybe_mngr is None:
-        raise RuntimeError(
-            'Someone must allocate a `ServiceMngr` using\n\n'
-            '`async with open_service_mngr()` beforehand!!\n'
-        )
-
-    return maybe_mngr
-
-
-async def _open_and_supervise_service_ctx(
-    serman: ServiceMngr,
-    name: str,
-    ctx_fn: Callable,  # TODO, type for `@tractor.context` requirement
-    portal: Portal,
-
-    allow_overruns: bool = False,
-    task_status: TaskStatus[
-        tuple[
-            trio.CancelScope,
-            Context,
-            trio.Event,
-            Any,
-        ]
-    ] = trio.TASK_STATUS_IGNORED,
-    **ctx_kwargs,
-
-) -> Any:
-    '''
-    Open a remote IPC-context defined by `ctx_fn` in the
-    (service) actor accessed via `portal` and supervise the
-    (local) parent task to termination at which point the remote
-    actor runtime is cancelled alongside it.
-
-    The main application is for allocating long-running
-    "sub-services" in a main daemon and explicitly controlling
-    their lifetimes from an actor-global singleton.
-
-    '''
-    # TODO: use the ctx._scope directly here instead?
-    # -[ ] actually what semantics do we expect for this
-    #   usage!?
-    with trio.CancelScope() as cs:
-        try:
-            async with portal.open_context(
-                ctx_fn,
-                allow_overruns=allow_overruns,
-                **ctx_kwargs,
-
-            ) as (ctx, started):
-
-                # unblock once the remote context has started
-                complete = trio.Event()
-                task_status.started((
-                    cs,
-                    ctx,
-                    complete,
-                    started,
-                ))
-                log.info(
-                    f'`pikerd` service {name} started with value {started}'
-                )
-                # wait on any context's return value
-                # and any final portal result from the
-                # sub-actor.
-                ctx_res: Any = await ctx.wait_for_result()
-
-                # NOTE: blocks indefinitely until cancelled
-                # either by error from the target context
-                # function or by being cancelled here by the
-                # surrounding cancel scope.
-                return (
-                    await portal.wait_for_result(),
-                    ctx_res,
-                )
-
-        except ContextCancelled as ctxe:
-            canceller: tuple[str, str] = ctxe.canceller
-            our_uid: tuple[str, str] = current_actor().uid
-            if (
-                canceller != portal.chan.uid
-                and
-                canceller != our_uid
-            ):
-                log.cancel(
-                    f'Actor-service `{name}` was remotely cancelled by a peer?\n'
-
-                    # TODO: this would be a good spot to use
-                    # a respawn feature Bo
-                    f'-> Keeping `pikerd` service manager alive despite this inter-peer cancel\n\n'
-
-                    f'cancellee: {portal.chan.uid}\n'
-                    f'canceller: {canceller}\n'
-                )
-            else:
-                raise
-
-        finally:
-            # NOTE: the ctx MUST be cancelled first if we
-            # don't want the above `ctx.wait_for_result()` to
-            # raise a self-ctxc. WHY, well since from the ctx's
-            # perspective the cancel request will have
-            # arrived out-out-of-band at the `Actor.cancel()`
-            # level, thus `Context.cancel_called == False`,
-            # meaning `ctx._is_self_cancelled() == False`.
-            # with trio.CancelScope(shield=True):
-            # await ctx.cancel()
-            await portal.cancel_actor()  # terminate (remote) sub-actor
-            complete.set()  # signal caller this task is done
-            serman.service_ctxs.pop(name)  # remove mngr entry
-
-
-# TODO: we need remote wrapping and a general soln:
-# - factor this into a ``tractor.highlevel`` extension # pack for the
-#   library.
-# - wrap a "remote api" wherein you can get a method proxy
-#   to the pikerd actor for starting services remotely!
-# - prolly rename this to ActorServicesNursery since it spawns
-#   new actors and supervises them to completion?
-@dataclass
-class ServiceMngr:
-    '''
-    A multi-subactor-as-service manager.
-
-    Spawn, supervise and monitor service/daemon subactors in a SC
-    process tree.
-
-    '''
-    an: ActorNursery
-    tn: trio.Nursery
-    debug_mode: bool = False # tractor sub-actor debug mode flag
-
-    service_tasks: dict[
-        str,
-        tuple[
-            trio.CancelScope,
-            trio.Event,
-        ]
-    ] = field(default_factory=dict)
-
-    service_ctxs: dict[
-        str,
-        tuple[
-            trio.CancelScope,
-            Context,
-            Portal,
-            trio.Event,
-        ]
-    ] = field(default_factory=dict)
-
-    # internal per-service task mutexs
-    _locks = defaultdict(trio.Lock)
-
-    # TODO, unify this interface with our `TaskManager` PR!
-    #
-    #
-    async def start_service_task(
-        self,
-        name: str,
-        # TODO: typevar for the return type of the target and then
-        # use it below for `ctx_res`?
-        fn: Callable,
-
-        allow_overruns: bool = False,
-        **ctx_kwargs,
-
-    ) -> tuple[
-        trio.CancelScope,
-        Any,
-        trio.Event,
-    ]:
-        async def _task_manager_start(
-            task_status: TaskStatus[
-                tuple[
-                    trio.CancelScope,
-                    trio.Event,
-                ]
-            ] = trio.TASK_STATUS_IGNORED,
-        ) -> Any:
-
-            task_cs = trio.CancelScope()
-            task_complete = trio.Event()
-
-            with task_cs as cs:
-                task_status.started((
-                    cs,
-                    task_complete,
-                ))
-                try:
-                    await fn()
-                except trio.Cancelled as taskc:
-                    log.cancel(
-                        f'Service task for `{name}` was cancelled!\n'
-                        # TODO: this would be a good spot to use
-                        # a respawn feature Bo
-                    )
-                    raise taskc
-                finally:
-                    task_complete.set()
-        (
-            cs,
-            complete,
-        ) = await self.tn.start(_task_manager_start)
-
-        # store the cancel scope and portal for later cancellation or
-        # retstart if needed.
-        self.service_tasks[name] = (
-            cs,
-            complete,
-        )
-        return (
-            cs,
-            complete,
-        )
-
-    async def cancel_service_task(
-        self,
-        name: str,
-
-    ) -> Any:
-        log.info(f'Cancelling `pikerd` service {name}')
-        cs, complete = self.service_tasks[name]
-
-        cs.cancel()
-        await complete.wait()
-        # TODO, if we use the `TaskMngr` from #346
-        # we can also get the return value from the task!
-
-        if name in self.service_tasks:
-            # TODO: custom err?
-            # raise ServiceError(
-            raise RuntimeError(
-                f'Service task {name!r} not terminated!?\n'
-            )
-
-    async def start_service_ctx(
-        self,
-        name: str,
-        portal: Portal,
-        # TODO: typevar for the return type of the target and then
-        # use it below for `ctx_res`?
-        ctx_fn: Callable,
-        **ctx_kwargs,
-
-    ) -> tuple[
-        trio.CancelScope,
-        Context,
-        Any,
-    ]:
-        '''
-        Start a remote IPC-context defined by `ctx_fn` in a background
-        task and immediately return supervision primitives to manage it:
-
-        - a `cs: CancelScope` for the newly allocated bg task
-        - the `ipc_ctx: Context` to manage the remotely scheduled
-          `trio.Task`.
-        - the `started: Any` value returned by the remote endpoint
-          task's `Context.started(<value>)` call.
-
-        The bg task supervises the ctx such that when it terminates the supporting
-        actor runtime is also cancelled, see `_open_and_supervise_service_ctx()`
-        for details.
-
-        '''
-        cs, ipc_ctx, complete, started = await self.tn.start(
-            functools.partial(
-                _open_and_supervise_service_ctx,
-                serman=self,
-                name=name,
-                ctx_fn=ctx_fn,
-                portal=portal,
-                **ctx_kwargs,
-            )
-        )
-
-        # store the cancel scope and portal for later cancellation or
-        # retstart if needed.
-        self.service_ctxs[name] = (cs, ipc_ctx, portal, complete)
-        return (
-            cs,
-            ipc_ctx,
-            started,
-        )
-
-    async def start_service(
-        self,
-        daemon_name: str,
-        ctx_ep: Callable,  # kwargs must `partial`-ed in!
-        # ^TODO, type for `@tractor.context` deco-ed funcs!
-
-        debug_mode: bool = False,
-        **start_actor_kwargs,
-
-    ) -> Context:
-        '''
-        Start new subactor and schedule a supervising "service task"
-        in it which explicitly defines the sub's lifetime.
-
-        "Service daemon subactors" are cancelled (and thus
-        terminated) using the paired `.cancel_service()`.
-
-        Effectively this API can be used to manage "service daemons"
-        spawned under a single parent actor with supervision
-        semantics equivalent to a one-cancels-one style actor-nursery
-        or "(subactor) task manager" where each subprocess's (and
-        thus its embedded actor runtime) lifetime is synced to that
-        of the remotely spawned task defined by `ctx_ep`.
-
-        The funcionality can be likened to a "daemonized" version of
-        `.hilevel.worker.run_in_actor()` but with supervision
-        controls offered by `tractor.Context` where the main/root
-        remotely scheduled `trio.Task` invoking `ctx_ep` determines
-        the underlying subactor's lifetime.
-
-        '''
-        entry: tuple|None = self.service_ctxs.get(daemon_name)
-        if entry:
-            (cs, sub_ctx, portal, complete) = entry
-            return sub_ctx
-
-        if daemon_name not in self.service_ctxs:
-            portal: Portal = await self.an.start_actor(
-                daemon_name,
-                debug_mode=(  # maybe set globally during allocate
-                    debug_mode
-                    or
-                    self.debug_mode
-                ),
-                **start_actor_kwargs,
-            )
-            ctx_kwargs: dict[str, Any] = {}
-            if isinstance(ctx_ep, functools.partial):
-                ctx_kwargs: dict[str, Any] = ctx_ep.keywords
-                ctx_ep: Callable = ctx_ep.func
-
-            (
-                cs,
-                sub_ctx,
-                started,
-            ) = await self.start_service_ctx(
-                name=daemon_name,
-                portal=portal,
-                ctx_fn=ctx_ep,
-                **ctx_kwargs,
-            )
-
-            return sub_ctx
-
-    async def cancel_service(
-        self,
-        name: str,
-
-    ) -> Any:
-        '''
-        Cancel the service task and actor for the given ``name``.
-
-        '''
-        log.info(f'Cancelling `pikerd` service {name}')
-        cs, sub_ctx, portal, complete = self.service_ctxs[name]
-
-        # cs.cancel()
-        await sub_ctx.cancel()
-        await complete.wait()
-
-        if name in self.service_ctxs:
-            # TODO: custom err?
-            # raise ServiceError(
-            raise RuntimeError(
-                f'Service actor for {name} not terminated and/or unknown?'
-            )
-
-        # assert name not in self.service_ctxs, \
-        #     f'Serice task for {name} not terminated?'

tractor/to_asyncio.py

@@ -34,7 +34,6 @@ from typing import (
 
 import tractor
 from tractor._exceptions import (
-    AsyncioCancelled,
     is_multi_cancelled,
 )
 from tractor._state import (
@@ -46,6 +45,11 @@ from tractor.log import (
     get_logger,
     StackLevelAdapter,
 )
+# TODO, wite the equiv of `trio.abc.Channel` but without attrs..
+# -[ ] `trionics.chan_types.ChanStruct` maybe?
+# from tractor.msg import (
+#     pretty_struct,
+# )
 from tractor.trionics._broadcast import (
     broadcast_receiver,
     BroadcastReceiver,
@@ -66,7 +70,12 @@ __all__ = [
 
 
 @dataclass
-class LinkedTaskChannel(trio.abc.Channel):
+class LinkedTaskChannel(
+    trio.abc.Channel,
+
+    # XXX LAME! meta-base conflict..
+    # pretty_struct.Struct,
+):
     '''
     A "linked task channel" which allows for two-way synchronized msg
     passing between a ``trio``-in-guest-mode task and an ``asyncio``
@@ -77,12 +86,14 @@ class LinkedTaskChannel(trio.abc.Channel):
     _from_aio: trio.MemoryReceiveChannel
     _to_trio: trio.MemorySendChannel
     _trio_cs: trio.CancelScope
+    _trio_task: trio.Task
     _aio_task_complete: trio.Event
 
     _trio_err: BaseException|None = None
     _trio_exited: bool = False
 
     # set after ``asyncio.create_task()``
+    # _aio_first: Any|None = None
     _aio_task: asyncio.Task|None = None
     _aio_err: BaseException|None = None
     _broadcaster: BroadcastReceiver|None = None
@@ -90,6 +101,25 @@ class LinkedTaskChannel(trio.abc.Channel):
     async def aclose(self) -> None:
         await self._from_aio.aclose()
 
+    def started(
+        self,
+        val: Any = None,
+    ) -> None:
+        self._aio_started_val = val
+        return self._to_trio.send_nowait(val)
+
+    # TODO, mk this side-agnostic?
+    #
+    # -[ ] add private meths for both sides and dynamically
+    #    determine which to use based on task-type read at calltime?
+    #    -[ ] `._recv_trio()`: receive to trio<-asyncio
+    #    -[ ] `._send_trio()`: send from trio->asyncio
+    #    -[ ] `._recv_aio()`: send from asyncio->trio
+    #    -[ ] `._send_aio()`: receive to asyncio<-trio
+    #
+    # -[ ] pass the instance to the aio side instead of the separate
+    #    per-side chan types?
+    #
     async def receive(self) -> Any:
         '''
         Receive a value from the paired `asyncio.Task` with
@@ -115,7 +145,16 @@ class LinkedTaskChannel(trio.abc.Channel):
             ):
                 raise err
 
-    async def wait_asyncio_complete(self) -> None:
+    async def send(self, item: Any) -> None:
+        '''
+        Send a value through to the asyncio task presuming
+        it defines a ``from_trio`` argument, if it does not
+        this method will raise an error.
+
+        '''
+        self._to_aio.put_nowait(item)
+
+    async def wait_aio_complete(self) -> None:
         await self._aio_task_complete.wait()
 
     def cancel_asyncio_task(
@@ -126,15 +165,6 @@ class LinkedTaskChannel(trio.abc.Channel):
             msg=msg,
         )
 
-    async def send(self, item: Any) -> None:
-        '''
-        Send a value through to the asyncio task presuming
-        it defines a ``from_trio`` argument, if it does not
-        this method will raise an error.
-
-        '''
-        self._to_aio.put_nowait(item)
-
     def closed(self) -> bool:
         return self._from_aio._closed  # type: ignore
 
@@ -218,7 +248,8 @@ def _run_asyncio_task(
 
     coro = func(**kwargs)
 
-    cancel_scope = trio.CancelScope()
+    trio_task: trio.Task = trio.lowlevel.current_task()
+    trio_cs = trio.CancelScope()
     aio_task_complete = trio.Event()
     aio_err: BaseException|None = None
 
@@ -226,7 +257,8 @@ def _run_asyncio_task(
         _to_aio=aio_q,  # asyncio.Queue
         _from_aio=from_aio,  # recv chan
         _to_trio=to_trio,  # send chan
-        _trio_cs=cancel_scope,
+        _trio_cs=trio_cs,
+        _trio_task=trio_task,
         _aio_task_complete=aio_task_complete,
     )
 
@@ -274,6 +306,9 @@ def _run_asyncio_task(
                 to_trio.send_nowait(result)
 
         finally:
+            # breakpoint()
+            # import pdbp; pdbp.set_trace()
+
             # if the task was spawned using `open_channel_from()`
             # then we close the channels on exit.
             if provide_channels:
@@ -281,7 +316,6 @@ def _run_asyncio_task(
                 # a ``trio.EndOfChannel`` to the trio (consumer) side.
                 to_trio.close()
 
-            # import pdbp; pdbp.set_trace()
             aio_task_complete.set()
             # await asyncio.sleep(0.1)
             log.info(
@@ -325,14 +359,17 @@ def _run_asyncio_task(
         )
         greenback.bestow_portal(task)
 
-    def cancel_trio(task: asyncio.Task) -> None:
+    def cancel_trio(
+        task: asyncio.Task,
+    ) -> None:
         '''
-        Cancel the calling `trio` task on error.
+        Cancel the parent `trio` task on any error raised by the
+        `asyncio` side.
 
         '''
         nonlocal chan
-        aio_err: BaseException|None = chan._aio_err
-        task_err: BaseException|None = None
+        relayed_aio_err: BaseException|None = chan._aio_err
+        aio_err: BaseException|None = None
 
         # only to avoid `asyncio` complaining about uncaptured
         # task exceptions
@@ -343,20 +380,20 @@ def _run_asyncio_task(
                 f'|_{res}\n'
             )
         except BaseException as _aio_err:
-            task_err: BaseException = _aio_err
-
+            aio_err: BaseException = _aio_err
             # read again AFTER the `asyncio` side errors in case
             # it was cancelled due to an error from `trio` (or
-            # some other out of band exc).
-            aio_err: BaseException|None = chan._aio_err
+            # some other out of band exc) and then set to something
+            # else?
+            relayed_aio_err: BaseException|None = chan._aio_err
 
             # always true right?
             assert (
-                type(_aio_err) is type(aio_err)
+                type(_aio_err) is type(relayed_aio_err)
             ), (
                 f'`asyncio`-side task errors mismatch?!?\n\n'
-                f'caught: {_aio_err}\n'
-                f'chan._aio_err: {aio_err}\n'
+                f'(caught) aio_err: {aio_err}\n'
+                f'chan._aio_err: {relayed_aio_err}\n'
             )
 
             msg: str = (
@@ -381,12 +418,13 @@ def _run_asyncio_task(
                     msg.format(etype_str='errored')
                 )
 
-
-        if aio_err is not None:
+        trio_err: BaseException|None = chan._trio_err
+        if (
+            relayed_aio_err
+            or
+            trio_err
+        ):
             # import pdbp; pdbp.set_trace()
-            # XXX: uhh is this true?
-            # assert task_err, f'Asyncio task {task.get_name()} discrepancy!?'
-
             # NOTE: currently mem chan closure may act as a form
             # of error relay (at least in the `asyncio.CancelledError`
             # case) since we have no way to directly trigger a `trio`
@@ -394,8 +432,6 @@ def _run_asyncio_task(
             # We might want to change this in the future though.
             from_aio.close()
 
-            if task_err is None:
-                assert aio_err
                 # wait, wut?
                 # aio_err.with_traceback(aio_err.__traceback__)
 
@@ -404,7 +440,7 @@ def _run_asyncio_task(
             # elif (
             #     type(aio_err) is CancelledError
             #     and  # trio was the cause?
-            #     cancel_scope.cancel_called
+            #     trio_cs.cancel_called
             # ):
             #     log.cancel(
             #         'infected task was cancelled by `trio`-side'
@@ -415,26 +451,83 @@ def _run_asyncio_task(
             # error in case the trio task is blocking on
             # a checkpoint.
             if (
-                not cancel_scope.cancelled_caught
+                not trio_cs.cancelled_caught
                 or
-                not cancel_scope.cancel_called
+                not trio_cs.cancel_called
             ):
                 # import pdbp; pdbp.set_trace()
-                cancel_scope.cancel()
+                trio_cs.cancel()
 
-            if task_err:
+            # maybe the `trio` task errored independent from the
+            # `asyncio` one and likely in between
+            # a guest-run-sched-tick.
+            #
+            # The obvious ex. is where one side errors during
+            # the current tick and then the other side immediately
+            # errors before its next checkpoint; i.e. the 2 errors
+            # are "independent".
+            #
+            # "Independent" here means in the sense that neither task
+            # was the explicit cause of the other side's exception
+            # according to our `tractor.to_asyncio` SC API's error
+            # relaying mechanism(s); the error pair is *possibly
+            # due-to* but **not necessarily** inter-related by some
+            # (subsys) state between the tasks,
+            #
+            # NOTE, also see the `test_trio_prestarted_task_bubbles`
+            # for reproducing detailed edge cases as per the above
+            # cases.
+            #
+            if (
+                not trio_cs.cancelled_caught
+                and
+                (trio_err := chan._trio_err)
+                and
+                type(trio_err) not in {
+                    trio.Cancelled,
+                }
+                and (
+                    aio_err
+                    and
+                    type(aio_err) not in {
+                        asyncio.CancelledError
+                    }
+                )
+            ):
+                eg = ExceptionGroup(
+                    'Both the `trio` and `asyncio` tasks errored independently!!\n',
+                    (trio_err, aio_err),
+                )
+                chan._trio_err = eg
+                chan._aio_err = eg
+                raise eg
+
+            elif aio_err:
                 # XXX raise any `asyncio` side error IFF it doesn't
                 # match the one we just caught from the task above!
                 # (that would indicate something weird/very-wrong
                 # going on?)
-                if aio_err is not task_err:
-                    # import pdbp; pdbp.set_trace()
-                    raise aio_err from task_err
+                if aio_err is not relayed_aio_err:
+                    raise aio_err from relayed_aio_err
+
+                raise aio_err
 
     task.add_done_callback(cancel_trio)
     return chan
 
 
+class AsyncioCancelled(Exception):
+    '''
+    Asyncio cancelled translation (non-base) error
+    for use with the ``to_asyncio`` module
+    to be raised in the ``trio`` side task
+
+    NOTE: this should NOT inherit from `asyncio.CancelledError` or
+    tests should break!
+
+    '''
+
+
 class TrioTaskExited(AsyncioCancelled):
     '''
     The `trio`-side task exited without explicitly cancelling the
@@ -483,13 +576,12 @@ async def translate_aio_errors(
 
         # import pdbp; pdbp.set_trace()  # lolevel-debug
 
-        # relay cancel through to called ``asyncio`` task
+        # relay cancel through to called `asyncio` task
         chan._aio_err = AsyncioCancelled(
             f'trio`-side cancelled the `asyncio`-side,\n'
             f'c)>\n'
             f'  |_{trio_task}\n\n'
 
-
             f'{trio_err!r}\n'
         )
 
@@ -546,6 +638,7 @@ async def translate_aio_errors(
             raise
 
     except BaseException as _trio_err:
+        # await tractor.pause(shield=True)
         trio_err = _trio_err
         log.exception(
             '`trio`-side task errored?'
@@ -619,11 +712,17 @@ async def translate_aio_errors(
                 # pump the other side's task? needed?
                 await trio.lowlevel.checkpoint()
 
+                # from tractor._state import is_root_process
+                # if is_root_process():
+                #     breakpoint()
+
                 if (
                     not chan._trio_err
                     and
                     (fut := aio_task._fut_waiter)
                 ):
+                    # await trio.lowlevel.checkpoint()
+                    # import pdbp; pdbp.set_trace()
                     fut.set_exception(
                         TrioTaskExited(
                             f'The peer `asyncio` task is still blocking/running?\n'
@@ -632,11 +731,6 @@ async def translate_aio_errors(
                         )
                     )
                 else:
-                    # from tractor._state import is_root_process
-                    # if is_root_process():
-                    #     breakpoint()
-                    #     import pdbp; pdbp.set_trace()
-
                     aio_taskc_warn: str = (
                         f'\n'
                         f'MANUALLY Cancelling `asyncio`-task: {aio_task.get_name()}!\n\n'
@@ -663,7 +757,7 @@ async def translate_aio_errors(
         # it erroed out up there!
         #
         if wait_on_aio_task:
-            # await chan.wait_asyncio_complete()
+            # await chan.wait_aio_complete()
             await chan._aio_task_complete.wait()
             log.info(
                 'asyncio-task is done and unblocked trio-side!\n'
@@ -771,11 +865,22 @@ async def open_channel_from(
             # sync to a "started()"-like first delivered value from the
             # ``asyncio`` task.
             try:
-                with chan._trio_cs:
+                with (cs := chan._trio_cs):
                     first = await chan.receive()
 
                     # deliver stream handle upward
                     yield first, chan
+            except trio.Cancelled as taskc:
+                # await tractor.pause(shield=True)  # ya it worx ;)
+                if cs.cancel_called:
+                    log.cancel(
+                        f'trio-side was manually cancelled by aio side\n'
+                        f'|_c>}}{cs!r}?\n'
+                    )
+                    # TODO, maybe a special `TrioCancelled`???
+
+                raise taskc
+
             finally:
                 chan._trio_exited = True
                 chan._to_trio.close()
@@ -893,12 +998,12 @@ def run_as_asyncio_guest(
     _sigint_loop_pump_delay: float = 0,
 
 ) -> None:
-# ^-TODO-^ technically whatever `trio_main` returns.. we should
-# try to use func-typevar-params at leaast by 3.13!
-# -[ ] https://typing.readthedocs.io/en/latest/spec/callables.html#callback-protocols
-# -[ ] https://peps.python.org/pep-0646/#using-type-variable-tuples-in-functions
-# -[ ] https://typing.readthedocs.io/en/latest/spec/callables.html#unpack-for-keyword-arguments
-# -[ ] https://peps.python.org/pep-0718/
+    # ^-TODO-^ technically whatever `trio_main` returns.. we should
+    # try to use func-typevar-params at leaast by 3.13!
+    # -[ ] https://typing.readthedocs.io/en/latest/spec/callables.html#callback-protocols
+    # -[ ] https://peps.python.org/pep-0646/#using-type-variable-tuples-in-functions
+    # -[ ] https://typing.readthedocs.io/en/latest/spec/callables.html#unpack-for-keyword-arguments
+    # -[ ] https://peps.python.org/pep-0718/
     '''
     Entry for an "infected ``asyncio`` actor".
 
@@ -957,15 +1062,15 @@ def run_as_asyncio_guest(
             #     force_reload=True,
             # )
 
-        def trio_done_callback(main_outcome):
+        def trio_done_callback(main_outcome: Outcome):
             log.runtime(
                 f'`trio` guest-run finishing with outcome\n'
                 f'>) {main_outcome}\n'
                 f'|_{trio_done_fute}\n'
             )
 
+            # import pdbp; pdbp.set_trace()
             if isinstance(main_outcome, Error):
-                # import pdbp; pdbp.set_trace()
                 error: BaseException = main_outcome.error
 
                 # show an dedicated `asyncio`-side tb from the error
@@ -1165,6 +1270,10 @@ def run_as_asyncio_guest(
                 )
                 raise AsyncioRuntimeTranslationError(message) from state_err
 
+        # XXX, should never get here ;)
+        # else:
+        #     import pdbp; pdbp.set_trace()
+
     # might as well if it's installed.
     try:
         import uvloop