Why are you referring to IBM ?
Re:What's new in Swift 3.1
by adamnemecek on Thursday January 26, 2017 @06:12PM
(#13496257)
They are the face of Swift on Linux.
What does Kitura use for threading and IO in Linux?
Is there any library for cross platform asynchronus IO?
Good question.
For networking, Kitura uses Kitura-net, which uses BlueSocket, which in turn uses C library's sockets[1]. On GNU/Linux, this is the GNU C Library, for which a package (Glibc) is provided by the Swift port[2].
For asynchrony they seem to be using libdispatch despite it being "early in the development"[3], but I've also noticed they're wrapping epoll and curl (see 1.B again), so it's hard to gauge the real extent of the hack.
[1]: https://github.com/IBM-Swift/Kitura/blob/master/Package.swif...
https://github.com/IBM-Swift/Kitura-net/blob/master/Package....
https://github.com/IBM-Swift/BlueSocket/blob/master/Sources/...
You'd be hard pressed to find a Swift project that doesn't depend on Apple's proprietary Foundation because Swift needs it to talk to the world!
I don't understand what IBM is thinking.