On 11/3/10 10:17 AM, John Baldwin wrote: > On Wednesday, November 03, 2010 1:04:13 pm mdf_at_freebsd.org wrote: >> >> So a MTX_DEF is okay in that environment? > Yes. In fact, the reason to have threads for interrupt handlers is to allow > interrupt handlers to use non-spin locks that block when the lock is held. > > MTX_SPIN locks are generally not needed in device drivers. The only reason a > driver would use one is if it used a filter handler which does not run in a > threaded context. It should be noted that in the case where you really just want to spin a few instructions because some other thread is accessing a structure you want, descheduling you. so you don't always incur the scheduling overhead.Received on Wed Nov 03 2010 - 17:16:03 UTC
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