On 26-Aug-2002 Maksim Yevmenkin wrote: > John Baldwin wrote: >> >> On 26-Aug-2002 M. Warner Losh wrote: >> > can you call wakeup(9) from a fast interrupt handler? > > [ ...] > >> > The only reason I ask is because sio seems to go out of its way to >> > schedule a soft interrupt to deal with waking up processes, which then >> > calls wakeup... >> >> Since wakeup only needs a spin lock, it is probably ok. You just can't call >> anything that would sleep (in any interrupt handler) or block on a non-spin >> mutex. > > what is the general locking technique for interrupt handlers? > there must be some sort of locking, right?
Normal interrupt handlers should use MTX_DEF mutexes. Fast interrupt handlers cannot use those, so they must use MTX_SPIN mutexes instead. -- John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
