spl protection of selrecord / selwakeup ?

[Dave Dolson]

In FreeBSD 4.7, 

When writing a device driver, which spl 
should be used when calling selrecord or 
selwakeup() ?

Some of the functions called by those functions
(e.g., pfind ) have no protection of their own.

Some drivers use spltty() or splimp().

Can someone explain why splhigh() is not required?

Thanks,
David Dolson (ddolson at sandvine.com, www.sandvine.com)