felspar-io Implementation

The contains three implementations:

• POSIX using poll
• Windows using WSAPoll
• Linux's io_uring

The poll and WSAPoll are similar, but not identical. The main part of the implementation is in:

• poll.hpp -- Common header containing completion tracking and common retry and cancellation code.
• poll.iops.cpp -- Implementation of the individual IOP APIs.
• poll.warden.cpp -- Implementation of the poll loop itself together with other code needed to have everything work.

The differences between poll and WSAPoll are handled through #if blocks.

There is a separate implementation io_uring in the following files:

• uring.hpp -- IOP delivery and completion header file.
• uring.iops.cpp -- Implementation of the various IOPs.
• uring.warden.cpp -- The io_uring submission and completion loop.

• convenience.cpp -- Contains a few helpers.
• posix.cpp -- Contains wrappers for some common POSIX APIs.
• tls.cpp -- Contains an implementation of TLS using OpenSSL.
• warden.cpp -- Common warden code (creating sockets and pipes).