OpenBSD's Answer: RThreads

• kernel threads: 1-1 architecture

  • minimal kernel changes

  • existing struct proc was left as the schedulable entity; struct process placed "above" that for shared information

• Six new syscalls:

  • thread creation and destruction: rfork(RFTHREAD) and threxit()

  • thread identification and signal redirection: getthrid() and thrsigdivert()

  • sleep and wakeup primitives: thrsleep() and thrwakeup()

• described by Ted Unangst, EuroBSD 2005