Metadata-Version: 2.1
Name: caio
Version: 0.9.5
Summary: Asynchronous file IO for Linux Posix and Windows.
Author: Dmitry Orlov <me@mosquito.su>
Author-email: me@mosquito.su
License: Apache Software License
Project-URL: Documentation, https://github.com/mosquito/caio/
Project-URL: Source, https://github.com/mosquito/caio
Platform: UNKNOWN
Classifier: License :: OSI Approved :: Apache Software License
Classifier: Topic :: Software Development
Classifier: Topic :: Software Development :: Libraries
Classifier: Intended Audience :: Developers
Classifier: Natural Language :: English
Classifier: Operating System :: MacOS
Classifier: Operating System :: POSIX
Classifier: Operating System :: Microsoft
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: Implementation :: CPython
Requires-Python: >=3.5.*, <4
License-File: LICENSE
Provides-Extra: develop
Requires-Dist: aiomisc ; extra == 'develop'
Requires-Dist: pytest ; extra == 'develop'
Requires-Dist: pytest-cov ; extra == 'develop'

Python wrapper for AIO
======================

.. warning:: Native Linux aio implementation supports since 4.18 kernel version.

Python bindings for Linux AIO API and simple asyncio wrapper.

Example
-------

.. code-block:: python

    import asyncio
    from caio import AsyncioContext

    loop = asyncio.get_event_loop()

    async def main():
        # max_requests=128 by default
        ctx = AsyncioContext(max_requests=128)

        with open("test.file", "wb+") as fp:
            fd = fp.fileno()

            # Execute one write operation
            await ctx.write(b"Hello world", fd, offset=0)

            # Execute one read operation
            print(await ctx.read(32, fd, offset=0))

            # Execute one fdsync operation
            await ctx.fdsync(fd)

            op1 = ctx.write(b"Hello from ", fd, offset=0)
            op2 = ctx.write(b"async world", fd, offset=11)

            await asyncio.gather(op1, op2)

            print(await ctx.read(32, fd, offset=0))
            # Hello from async world


    loop.run_until_complete(main())


Troubleshooting
---------------

The ``linux`` implementation works normal for modern linux kernel versions
and file systems. So you may have problems specific for your environment.
It's not a bug and might be resolved some ways:

1. Upgrade the kernel
2. Use compatible file system
3. Use threads based or pure python implementation.

The caio since version 0.7.0 contains some ways to do this.

1. In runtime use the environment variable ``CAIO_IMPL`` with
possible values:

* ``linux`` - use native linux kernels aio mechanism
* ``thread`` - use thread based implementation written in C
* ``python`` - use pure python implementation

2.  File ``default_implementation`` located near ``__init__.py`` in caio
installation path. It's useful for distros package maintainers. This file
might contains comments (lines starts with ``#`` symbol) and the first line
should be one of ``linux`` ``thread`` or ``python``.

Previous versions allows direct import of the target implementation.


