Re: [Firebird-devel] Providers, yvalve, external engines and object lifecycle

[Alex P. <pes...@ma...>]

 On 03/28/11 23:26, Adriano dos Santos Fernandes wrote:
> On 28-03-2011 04:36, Alex Peshkoff wrote:
>> Certainly, more clever helper object can solve a problem. But I do not
>> see a way to build it without lock. And I claim that this is too high
>> price for removing reference counters from API.
>>
> I must say here that if you're going to create proxy objects that do:
> if (x)
>     x->something();
>
> And concurrently do:
> x = NULL;
>
> let saying, "x" is a Jrd::Attachment or a jrd_tra, this is VERY incorrect.
 
Certainly. But if concurrently we have a call that makes x to become
invalid pointer (detach/drop/commit/rollback when used without
refCounted objects), this has same effect as x = NULL;