On Thu, Jan 26, 2012 at 08:39:07AM -0500, John Baldwin wrote: > What is the purpose of the atomics? Doing atomic_load/atomic_store > is just as racy as if you had not used atomics at all.
Thanx for a hint. Protecting comparison itself isn't essential as protecting variable consitency because random_yarrow_unblock() which triggers operation isn't called concurrently, but arc4rand() is. I consider your suggested way a bit later. Yes, it seems acq/rel memory barriers are unneded, > Should you be > using atomic_cmpset instead, e.g.: > > case ARC4_ENTER_HAVE: > /* XXX: What does it mean for this to fail? */ It means "Request to have enough entropy, but already have or even already reseed". > atomic_cmpset_int(&iniseed_state, ARC4_ENTER_NONE, > ARC4_ENTER_HAVE); > break; -- http://ache.vniz.net/ _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
