Help request -- Mutex(9) indicates that mutex replaces the spl(9) system. (1) When writing an interrupt handler, should the handler acquire a spin mutex before modifying some IO that may be accessed also by a LWP?
(2) What happens when the interrupt handler cannot acquire the mutex? Will the LWP that holds it ever be able to run again? (3) Will a LWP that holds a spin mutex be pre-empted by the scheduler? Thanks to anyone who might offer some help to this poor soul -- Frank Zerangue
