Asynchronous read file with boost asio

Question

I would like to read a large file in C++ in an asynchronous manner. I already use boost::asio to perform async reads from network sockets, and I wonder if it is possible to extend boost::asio to do non-blocking reads on regular files.

I could use a separate thread to do the job, but is there a more native solution, that would fit well with asio::io_service ?

I am using Linux, but I won't reject a portable solution with std::ifstream ;)

did you see http://stackoverflow.com/questions/14001387/how-to-use-asio-with-device-files ? — m.s., Aug 06 '15 at 10:37
this question was about device files, but I want to read any file — Steakfly, Aug 06 '15 at 11:17

score -1 · Answer 1 · answered Aug 06 '15 at 10:39

-1

Linux does not support non-blocking file reads. boost::asio does not support async read files on linux, too.

You can use aio_read(3) manually, but it creates a system thread to do the job.

answered Aug 06 '15 at 10:39

Galimov Albert

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You're sure Linux does not support non-blocking file io ? http://man7.org/linux/man-pages/man7/aio.7.html – Richard Hodges Aug 06 '15 at 11:05
@RichardHodges its same as aio_read. Its not "true" asynchronous. – Galimov Albert Aug 06 '15 at 16:51
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It seems to me that The documentation does not agree with your position. Don't we code to interfaces and allow the implementation latitude in doing its work? – Richard Hodges Aug 06 '15 at 20:56

Asynchronous read file with boost asio

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