Garbage Collector triggering when deleting an object

[Sean]

I am writing a Golang wrapper for OpenAL-Soft.
I need to create some buffers. These operations are happening on the
OpenAL-Soft side (So C functions). I am loading PCM data into buffers.

Can I set up a trigger mechanism like "x.__del__" as in Python?

I can set the garbage collector to follow some objects.
But I have to call some C functions (alDeleteBuffers) to delete buffers
in OpenAL.

I want garbage collector to run this function while deleting the object.

Is this possible?

[Robert Engels]

Read about Go finalizers.

> On Nov 22, 2020, at 6:13 AM, Sean <s.tolst...@gmail.com> wrote:
>
> I am writing a Golang wrapper for OpenAL-Soft.

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[tokers]

There is a runtime.SetFinalizer function.

[Tamás Gulácsi]

There is a runtime.SetFinalizer, but it is not guaranteed to be run, anytime.

The most idiomatic and safe solution is to have a Close() method on the Go side, which frees the C side.

You may even add a Finalizer that panics if Close haven't been called before...

[tokers]

Are there any documents?

[Robert Engels]

Finalizers are essential in a highly concurrent system - otherwise you are doing manual resource management with automatic memory management (a resource) and its ugly and error prone. 

Even though they are no guaranteed to be called they work very well to manage shared resources. 

On Nov 23, 2020, at 5:32 AM, tokers <zcha...@gmail.com> wrote:

Are there any documents?

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[jake...@gmail.com]

On Monday, November 23, 2020 at 6:31:50 AM UTC-5 tokers wrote:

Are there any documents?

 

https://golang.org/pkg/runtime/#SetFinalizer

[Tyler Compton]

If you're using finalizers to clean up C memory, it's important to know that the Go garbage collector has no understanding of how much C memory a given resource holds. This prevents the garbage collector from making smart decisions about when to release your resources. I've never personally seen this become an issue, but it's something to keep in mind.