POSIX Asynchronous I/O, from OSNews.

Used judiciously, asynchronous I/O (short for AIO) can provide a significant speed benefit, says David Chisnall. Perhaps enough to help your program overcome the fact that modern processors can really zoom, while hard drives still drag.

Code using AIO on Linux must be linked with -lrt to provide support for the POSIX real-time extensions, which means it may not be the kernel I/O mechanism, especially Kernel AIO Support for Linux has not been merged into mainline kernel yet.

After studying rt extensions in glibc source, I find how do they implement posix AIO in glibc — a thread pool plus a request waiting queue. Besides, helper thread will be spawned to manage the request, hence it’s not so trivial.

There is something interesting when freeing allocated resources. You can see the function libc_freeres_fn() in aio_misc.c. This is also why it is unnecessary to implement “destroy” API.

Whereas, FreeBSD has AIO family system calls. I, however, have no experience with AIO in FreeBSD, but it seems AIO in FreeBSD has kernel support? If so, it would be more efficient than Linux until now?

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