sigsched

Unix singal-based native code scheduler

docs to read:

• http://www.opennet.ru/base/dev/unix_signals.txt.html (Russian)
• http://www.unix.com/programming/90783-signal-handling-context-switches-2.html?s=444f66ad429417a930850e67eb5a0c77
• https://labs.portcullis.co.uk/blog/ohm-2013-review-of-returning-signals-for-fun-and-profit/