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70 lines
2.3 KiB
70 lines
2.3 KiB
1 week ago
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from __future__ import annotations
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import sys
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from collections.abc import Callable
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from typing import TypeVar
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from warnings import warn
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from ._core._eventloop import get_async_backend
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from .abc import CapacityLimiter
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if sys.version_info >= (3, 11):
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from typing import TypeVarTuple, Unpack
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else:
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from typing_extensions import TypeVarTuple, Unpack
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T_Retval = TypeVar("T_Retval")
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PosArgsT = TypeVarTuple("PosArgsT")
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async def run_sync(
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func: Callable[[Unpack[PosArgsT]], T_Retval],
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*args: Unpack[PosArgsT],
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abandon_on_cancel: bool = False,
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cancellable: bool | None = None,
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limiter: CapacityLimiter | None = None,
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) -> T_Retval:
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"""
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Call the given function with the given arguments in a worker thread.
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If the ``cancellable`` option is enabled and the task waiting for its completion is
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cancelled, the thread will still run its course but its return value (or any raised
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exception) will be ignored.
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:param func: a callable
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:param args: positional arguments for the callable
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:param abandon_on_cancel: ``True`` to abandon the thread (leaving it to run
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unchecked on own) if the host task is cancelled, ``False`` to ignore
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cancellations in the host task until the operation has completed in the worker
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thread
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:param cancellable: deprecated alias of ``abandon_on_cancel``; will override
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``abandon_on_cancel`` if both parameters are passed
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:param limiter: capacity limiter to use to limit the total amount of threads running
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(if omitted, the default limiter is used)
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:return: an awaitable that yields the return value of the function.
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"""
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if cancellable is not None:
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abandon_on_cancel = cancellable
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warn(
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"The `cancellable=` keyword argument to `anyio.to_thread.run_sync` is "
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"deprecated since AnyIO 4.1.0; use `abandon_on_cancel=` instead",
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DeprecationWarning,
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stacklevel=2,
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)
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return await get_async_backend().run_sync_in_worker_thread(
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func, args, abandon_on_cancel=abandon_on_cancel, limiter=limiter
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)
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def current_default_thread_limiter() -> CapacityLimiter:
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"""
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Return the capacity limiter that is used by default to limit the number of
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concurrent threads.
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:return: a capacity limiter object
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"""
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return get_async_backend().current_default_thread_limiter()
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