ISTM that the docs imply this:
When the garbage collector finds an unreachable block with an associated
> finalizer, it clears the association and runs finalizer(obj) in a separate
> goroutine. This makes obj reachable again, but now without an associated
> finalizer. Assuming that SetFinalizer is not called again, the next time
> the garbage collector sees that obj is unreachable, it will free obj.
As long as we assume that the GC only collects unreachable data (which
seems extremely plausible), it won't collect data that has a finalizer
without running said finalizer.
I do think there are still some subtleties though. For example, if your
finalizer does not actually *use* its parameter, the data might be
considered unreachable (and collected) before you would consider the
finalizer to "have run". e.g. if your finalizer is
func finalize(p *int) {
fmt.Println("finalizer ran")
}
`p` might be collected before `finalizer ran` is printed. That is, your
statement is only true if by "finalizer is run" you mean "finalizer is
called", not "finalizer has returned".
At least as far as I understand it. Finalizers are subtle and I won't claim
to actually understand them.
On Thu, Mar 11, 2021 at 3:44 PM tapi...@gmail.com <tapir....@gmail.com>
wrote:
> (sorry, missed a "if")
> .... So if the tailscale trick is valid, could I think that an object is
> not collected for sure if it has a finalizer and the finalizer has not run
> yet?
>
> On Thursday, March 11, 2021 at 9:42:49 AM UTC-5 tapi...@gmail.com wrote:
>
>>
>> The tailscale article
>> https://tailscale.com/blog/netaddr-new-ip-type-for-go/ mentions a
>> finalizer trick.
>>
>> The SetFinalizer docs says the finalizer of an object is not guaranteed
>> to be run. So the tailscale trick is valid, could I think that an object is
>> not collected for sure if it has a finalizer and the finalizer has not run
>> yet?
>>
>>
>>
>>
>> --
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