Linux Asynchronous Io Howto
Asynchronous io and event notification on linux. Input and output io operations on a computer can be extremely slow compared to the processing of data.
An io device can incorporate mechanical devices that must physically move such as a hard drive seeking a.
Linux asynchronous io howto. In a traditional io model there is an io channel that is identified by a unique handle. In unix these are file descriptors which are the same for files pipes sockets and so on. The asynchronous inputoutput aio interface allows many io requests to be submitted in parallel without the overhead of a thread per request.
Added proper introduction general cleanups made the problems with posix aio clearer. Full asynchronous io the state of aio in linux is not overly pretty. Introduction to aio for linux.
Updated 2292009re ordered the sections a bit added information on the difference between edge and level triggered notification mechanisms and added information on signalfd and the signal handler writes to pipe techniques. This section explores the asynchronous io model for linux to help you understand how to apply it in your applications. On linux asynchronous file io linux offers a wide well known array of options to do asynchronous io over sockets pipes fifos and other transport mechanisms that can be represented as a file descriptor.
In computer science asynchronous io also non sequential io is a form of inputoutput processing that permits other processing to continue before the transmission has finished. Aio7 linux programmers manual aio7 name top aio posix asynchronous io overview description top the posix asynchronous io aio interface allows applications to initiate one or more io operations that are performed asynchronously ie in the background. Posix standardized an api for asynchronous file aio and linux in.
The purpose of this document is to explain how to use the linux aio interface namely the function family iosetup iosubmit iogetevents iodestroy.
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