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Python wrapper for AIO

Python bindings for async file I/O on Linux and a pure-Python/thread fallback for other platforms.

Three backends are available:

Backend Kernel Notes
linux_uring ≥ 5.6 io_uring - shared ring buffers, zero-syscall completions
linux_aio ≥ 4.18 kernel AIO (io_submit / io_getevents), O_DIRECT only
thread_aio any pthreads pool, portable
python_aio any pure Python, no C extension required

Example

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())

Selecting a backend

from caio import AsyncioContext picks the best available backend automatically (linux_uring → linux_aio → thread_aio → python_aio).

To force a specific backend use the CAIO_IMPL environment variable:

CAIO_IMPL=uring   python my_app.py   # linux_uring
CAIO_IMPL=linux   python my_app.py   # linux_aio
CAIO_IMPL=thread  python my_app.py   # thread_aio
CAIO_IMPL=python  python my_app.py   # python_aio

Or import a backend directly:

# io_uring (Linux ≥ 5.6)
from caio.linux_uring_asyncio import AsyncioContext

# kernel AIO (Linux ≥ 4.18)
from caio.linux_aio_asyncio import AsyncioContext

# thread pool
from caio.thread_aio_asyncio import AsyncioContext

A default_implementation file placed next to caio/__init__.py (useful for distro package maintainers) may contain one of uring, linux, thread, or python on its first non-comment line.

Troubleshooting

io_uring blocked by seccomp

Containers (Docker, Podman, Kubernetes) often block io_uring via a seccomp filter. The import will raise ImportError with a diagnostic message if io_uring_setup(2) returns ENOSYS.

Fix:

# Docker / Podman
docker run --security-opt seccomp=unconfined ...

# Kubernetes
securityContext:
  seccompProfile:
    type: Unconfined

linux_aio compatibility

linux_aio requires kernel ≥ 4.18 and a compatible filesystem. If it does not work in your environment you can fall back to thread or python:

CAIO_IMPL=thread python my_app.py

Metadata

Release files for caio 0.12.10

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for caio 0.12.10
File Size Uploaded Provenance
caio-0.12.10.tar.gz 84.1 kB With provenance Details

Built distributions (wheels)

Table of built distributions (wheels) for caio 0.12.10
File
caio-0.12.10-py3-none-any.whl Python 3 none any Details
caio-0.12.10-cp315-cp315t-musllinux_1_2_x86_64.whl CPython 3.15 CPython 3.15 free-threading Linux musl 1.2+ x86-64 Details
caio-0.12.10-cp315-cp315t-musllinux_1_2_aarch64.whl CPython 3.15 CPython 3.15 free-threading Linux musl 1.2+ ARM64 Details
caio-0.12.10-cp315-cp315t-manylinux_2_34_x86_64.whl CPython 3.15 CPython 3.15 free-threading Linux glibc 2.34+ x86-64 Details
caio-0.12.10-cp315-cp315t-manylinux_2_34_aarch64.whl CPython 3.15 CPython 3.15 free-threading Linux glibc 2.34+ ARM64 Details
caio-0.12.10-cp315-cp315t-macosx_11_0_arm64.whl CPython 3.15 CPython 3.15 free-threading macOS 11.0+ ARM64 Details
caio-0.12.10-cp315-cp315-musllinux_1_2_x86_64.whl CPython 3.15 CPython 3.15 Linux musl 1.2+ x86-64 Details
caio-0.12.10-cp315-cp315-musllinux_1_2_aarch64.whl CPython 3.15 CPython 3.15 Linux musl 1.2+ ARM64 Details
caio-0.12.10-cp315-cp315-manylinux_2_34_x86_64.whl CPython 3.15 CPython 3.15 Linux glibc 2.34+ x86-64 Details
caio-0.12.10-cp315-cp315-manylinux_2_34_aarch64.whl CPython 3.15 CPython 3.15 Linux glibc 2.34+ ARM64 Details
caio-0.12.10-cp315-cp315-macosx_26_0_arm64.whl CPython 3.15 CPython 3.15 macOS 26.0+ ARM64 Details
caio-0.12.10-cp314-cp314t-musllinux_1_2_x86_64.whl CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ x86-64 Details
caio-0.12.10-cp314-cp314t-musllinux_1_2_aarch64.whl CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ ARM64 Details
caio-0.12.10-cp314-cp314t-manylinux_2_34_x86_64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.34+ x86-64 Details
caio-0.12.10-cp314-cp314t-manylinux_2_34_aarch64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.34+ ARM64 Details
caio-0.12.10-cp314-cp314t-macosx_11_0_arm64.whl CPython 3.14 CPython 3.14 free-threading macOS 11.0+ ARM64 Details
caio-0.12.10-cp314-cp314-musllinux_1_2_x86_64.whl CPython 3.14 CPython 3.14 Linux musl 1.2+ x86-64 Details
caio-0.12.10-cp314-cp314-musllinux_1_2_aarch64.whl CPython 3.14 CPython 3.14 Linux musl 1.2+ ARM64 Details
caio-0.12.10-cp314-cp314-manylinux_2_34_x86_64.whl CPython 3.14 CPython 3.14 Linux glibc 2.34+ x86-64 Details
caio-0.12.10-cp314-cp314-manylinux_2_34_aarch64.whl CPython 3.14 CPython 3.14 Linux glibc 2.34+ ARM64 Details
caio-0.12.10-cp314-cp314-macosx_26_0_arm64.whl CPython 3.14 CPython 3.14 macOS 26.0+ ARM64 Details
caio-0.12.10-cp313-cp313t-macosx_11_0_arm64.whl CPython 3.13 CPython 3.13 free-threading macOS 11.0+ ARM64 Details
caio-0.12.10-cp313-cp313-musllinux_1_2_x86_64.whl CPython 3.13 CPython 3.13 Linux musl 1.2+ x86-64 Details
caio-0.12.10-cp313-cp313-musllinux_1_2_aarch64.whl CPython 3.13 CPython 3.13 Linux musl 1.2+ ARM64 Details
caio-0.12.10-cp313-cp313-manylinux_2_34_x86_64.whl CPython 3.13 CPython 3.13 Linux glibc 2.34+ x86-64 Details
caio-0.12.10-cp313-cp313-manylinux_2_34_aarch64.whl CPython 3.13 CPython 3.13 Linux glibc 2.34+ ARM64 Details
caio-0.12.10-cp313-cp313-macosx_10_13_universal2.whl CPython 3.13 CPython 3.13 macOS 10.13+ universal2 (ARM64, x86-64) Details
caio-0.12.10-cp312-cp312-musllinux_1_2_x86_64.whl CPython 3.12 CPython 3.12 Linux musl 1.2+ x86-64 Details
caio-0.12.10-cp312-cp312-musllinux_1_2_aarch64.whl CPython 3.12 CPython 3.12 Linux musl 1.2+ ARM64 Details
caio-0.12.10-cp312-cp312-manylinux_2_34_x86_64.whl CPython 3.12 CPython 3.12 Linux glibc 2.34+ x86-64 Details
caio-0.12.10-cp312-cp312-manylinux_2_34_aarch64.whl CPython 3.12 CPython 3.12 Linux glibc 2.34+ ARM64 Details
caio-0.12.10-cp312-cp312-macosx_10_13_universal2.whl CPython 3.12 CPython 3.12 macOS 10.13+ universal2 (ARM64, x86-64) Details
caio-0.12.10-cp311-cp311-musllinux_1_2_x86_64.whl CPython 3.11 CPython 3.11 Linux musl 1.2+ x86-64 Details
caio-0.12.10-cp311-cp311-musllinux_1_2_aarch64.whl CPython 3.11 CPython 3.11 Linux musl 1.2+ ARM64 Details
caio-0.12.10-cp311-cp311-manylinux_2_34_x86_64.whl CPython 3.11 CPython 3.11 Linux glibc 2.34+ x86-64 Details
caio-0.12.10-cp311-cp311-manylinux_2_34_aarch64.whl CPython 3.11 CPython 3.11 Linux glibc 2.34+ ARM64 Details
caio-0.12.10-cp311-cp311-macosx_10_9_universal2.whl CPython 3.11 CPython 3.11 macOS 10.9+ universal2 (ARM64, x86-64) Details
caio-0.12.10-cp310-cp310-musllinux_1_2_x86_64.whl CPython 3.10 CPython 3.10 Linux musl 1.2+ x86-64 Details
caio-0.12.10-cp310-cp310-musllinux_1_2_aarch64.whl CPython 3.10 CPython 3.10 Linux musl 1.2+ ARM64 Details
caio-0.12.10-cp310-cp310-manylinux_2_34_x86_64.whl CPython 3.10 CPython 3.10 Linux glibc 2.34+ x86-64 Details
caio-0.12.10-cp310-cp310-manylinux_2_34_aarch64.whl CPython 3.10 CPython 3.10 Linux glibc 2.34+ ARM64 Details
caio-0.12.10-cp310-cp310-macosx_11_0_arm64.whl CPython 3.10 CPython 3.10 macOS 11.0+ ARM64 Details

Total release size: 5.9 MB

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