On Fri, Dec 22, 2017 at 09:29:15AM +0000, Reshetova, Elena wrote: > > On Wed, Nov 29, 2017 at 01:15:43PM +0200, Elena Reshetova wrote: > > atomic_t variables are currently used to implement reference > > counters with the following properties: > > - counter is initialized to 1 using atomic_set() > > - a resource is freed upon counter reaching zero > > - once counter reaches zero, its further > > increments aren't allowed > > - counter schema uses basic atomic operations > > (set, inc, inc_not_zero, dec_and_test, etc.) > > >Whoops, I forgot that this doesn't apply to h_count. > > >Well, it's confusing, because h_count is actually used in two different > >ways: depending on whether a nlm_host represents a client or server, it > >may have the above properties or not. > > > So, what happens when it is not having the above properties? Is the object > being reused or?
The object isn't destroyed when the counter hits zero--zero is just taken as a hint to some garbage collection algorithm that it would be OK to destroy it. So decrementing to or incrementing from zero is OK. --b.
