Indeed pthread is Linux only, but we do have a Windows version of it. The project is being worked on with both Linux and Windows (msvc v2015-v2017 if I'm not mistaken) so we know it compile and runs on both platforms. Don't hesitate to come and talk to us, Raven is mostly the one working on windows so he should be able to help you!
The build process is still a wip I'm afraid so it might be a little bit bumpy atm.