[erlang-questions] enif_get_resource and reference counting

John Doe <>
Sun Jan 10 11:09:36 CET 2016


Thank you!  Thought so, but was not 100% sure.

2016-01-10 0:20 GMT+03:00 Daniel Goertzen <>:

> enif_get_resource() does not increase the reference count.  You can think
> of the term representing the resource as counting as a reference, so as
> long as the term and its environment are alive then the resource will not
> be destroyed.  In the example you have above you can skip the
> keep()/release() because the resource term w/environment keeps it alive.
>
> On Sat, Jan 9, 2016 at 12:12 AM John Doe <> wrote:
>
>> Hi,
>> Does successful call of enif_get_resource increase reference counter on a
>> resource, like  enif_keep_resource does?
>> Or It is neccessary to do
>> enif_get_resource(...);
>> enif_keep_resource(...);
>> ...some job...
>> enif_release_resource(...);
>>
>> And if it does not increment the counter, can the resource become
>> destroyed in the another thread between calls to enif_get_resource and
>> enif_keep_resource?
>> I'm afraid of race condition there.
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>> 
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>>
>
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