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توضیحات

Read write lock for asyncio.

ویژگی	مقدار
سیستم عامل	-
نام فایل	aiorwlock-1.3.0
نام	aiorwlock
نسخه کتابخانه	1.3.0
نگهدارنده	[]
ایمیل نگهدارنده	[]
نویسنده	Nikolay Novik
ایمیل نویسنده	nickolainovik@gmail.com
آدرس صفحه اصلی	https://github.com/aio-libs/aiorwlock
آدرس اینترنتی	https://pypi.org/project/aiorwlock/
مجوز	Apache 2

aiorwlock ========= .. image:: https://github.com/aio-libs/aiorwlock/workflows/CI/badge.svg :target: https://github.com/aio-libs/aiorwlock/actions?query=workflow%3ACI .. image:: https://codecov.io/gh/aio-libs/aiorwlock/branch/master/graph/badge.svg :target: https://codecov.io/gh/aio-libs/aiorwlock .. image:: https://badges.gitter.im/Join%20Chat.svg :target: https://gitter.im/aio-libs/Lobby :alt: Chat on Gitter Read write lock for asyncio_ . A ``RWLock`` maintains a pair of associated locks, one for read-only operations and one for writing. The read lock may be held simultaneously by multiple reader tasks, so long as there are no writers. The write lock is exclusive. Whether or not a read-write lock will improve performance over the use of a mutual exclusion lock depends on the frequency that the data is *read* compared to being *modified*. For example, a collection that is initially populated with data and thereafter infrequently modified, while being frequently searched is an ideal candidate for the use of a read-write lock. However, if updates become frequent then the data spends most of its time being exclusively locked and there is little, if any increase in concurrency. Implementation is almost direct port from this patch_. Example ------- Requires Python 3.5.3+ .. code:: python import asyncio import aiorwlock async def go(): rwlock = aiorwlock.RWLock() # acquire reader lock, multiple coroutines allowed to hold the lock async with rwlock.reader_lock: print('inside reader lock') await asyncio.sleep(0.1) # acquire writer lock, only one coroutine can hold the lock async with rwlock.writer_lock: print('inside writer lock') await asyncio.sleep(0.1) loop = asyncio.get_event_loop() loop.run_until_complete(go()) Fast path --------- By default `RWLock` switches context on lock acquiring. That allows to other waiting tasks get the lock even if task that holds the lock doesn't contain context switches (`await fut` statements). The default behavior can be switched off by `fast` argument: `RWLock(fast=True)`. Long story short: lock is safe by default, but if you sure you have context switches (`await`, `async with`, `async for` or `yield from` statements) inside locked code you may want to use `fast=True` for minor speedup. TLA+ Specification ------------------ TLA+ specification of ``aiorwlock`` provided in this repository. License ------- ``aiorwlock`` is offered under the Apache 2 license. .. _asyncio: http://docs.python.org/3.8/library/asyncio.html .. _patch: http://bugs.python.org/issue8800 Changes ------- 1.3.0 (2022-1-18) ^^^^^^^^^^^^^^^^^^ * Dropped Python 3.6 support * Python 3.10 is officially supported * Drop deprecated `loop` parameter from `RWLock` constructor 1.2.0 (2021-11-09) ^^^^^^^^^^^^^^^^^^ * Fix a bug that makes concurrent writes possible under some (rare) conjunctions (#235) 1.1.0 (2021-09-27) ^^^^^^^^^^^^^^^^^^ * Remove explicit loop usage in `asyncio.sleep()` call, make the library forward compatible with Python 3.10 1.0.0 (2020-12-32) ^^^^^^^^^^^^^^^^^^ * Fix a bug with cancelation during acquire #170 (thanks @romasku) * Deprecate passing explicit `loop` argument to `RWLock` constructor * Deprecate creation of `RWLock` instance outside of async function context * Minimal supported version is Python 3.6 * The library works with Python 3.8 and Python 3.9 seamlessly 0.6.0 (2018-12-18) ^^^^^^^^^^^^^^^^^^ * Wake up all readers after writer releases lock #60 (thanks @ranyixu) * Fixed Python 3.7 compatibility * Removed old `yield from` syntax * Minimal supported version is Python 3.5.3 * Removed support for none async context managers 0.5.0 (2017-12-03) ^^^^^^^^^^^^^^^^^^ * Fix corner cases and deadlock when we upgrade lock from write to read #39 * Use loop.create_future instead asyncio.Future if possible 0.4.0 (2015-09-20) ^^^^^^^^^^^^^^^^^^ * Support Python 3.5 and `async with` statement * rename `.reader_lock` -> `.reader`, `.writer_lock` -> `.writer`. Backward compatibility is preserved. 0.3.0 (2014-02-11) ^^^^^^^^^^^^^^^^^^ * Add `.locked` property 0.2.0 (2014-02-09) ^^^^^^^^^^^^^^^^^^ * Make `.release()` non-coroutine 0.1.0 (2014-12-22) ^^^^^^^^^^^^^^^^^^ * Initial release

زبان مورد نیاز

مقدار	نام
>=3.7.0	Python

نحوه نصب

نصب پکیج whl aiorwlock-1.3.0:

pip install aiorwlock-1.3.0.whl

نصب پکیج tar.gz aiorwlock-1.3.0:

pip install aiorwlock-1.3.0.tar.gz