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Python Asynchronous I/O bindings (aio.h)

Version 0.3 Linux only

You should wait for the callback to finish before queuing more requests in a tight loop. pyaio could hang if you hit the max aio queue size.

Tuning

pyaio.aio_init(max threads, max aio queue, max thread sleep time)

Linux Defaults to 20 threads and 64 queue size. Pyaio will use 5cores and 4threads instead of those values if larger.

Reading

API

python view = aio_read(fileno, file-offset, length, callback)

Example

import pyaio
import os

def aio_callback(buf, rcode, errno):
    if rcode > 0:
        print 'python callback %s' % buf
    elif rcode == 0:
        print "EOF"
    else:
        print "Error: %d" % errno

fd = os.open('/tmp/pyaio.txt', os.O_RDONLY)
pyaio.aio_read(fd, 10, 20, aio_callback)

Writing

API

python aio_write(fileno, buffer-object, file-offset, callback)

Example

import pyaio
import os

def aio_callback(rt, errno):
    if rt > 0:
        print "Wrote %d bytes" % rt
    else:
        print "Got error: %d" % errno

fd = os.open('/tmp/pyaio.txt', os.O_WRONLY)
pyaio.aio_write(fd, "Writing Test.......", 30, aio_callback)

gevent Wrapper

For a file() like wrapper around aio_read and aio_write using gevent a 'buffer' keyword argument to aioFile controls its internal buffer size

from pyaio.gevent import aioFile
with aioFile('/tmp/pyaio.txt') as fr:
    data = fr.read()  # Entire File

with aioFile('/tmp/pyaio.txt', 'w') as fw:
    fw.write(data)
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