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Unsure what you mean by "mutators". I am guessing "pointers that can be used to modify data at a memory address"

If so, how can you (as a GC) be sure that while you were adding up all the pointers to an address, and finding none, that another one was not made?

Mystified

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Mutators are threads that allocate memory and manipulate pointers, they can work completely independently of the GC. A mutator needs only to tag an object when copies or moves a pointer to this object. The GC detects this tag and marks the object as alive. Here is a working implementation for C++: https://github.com/pebal/sgcl

I could listen to you or whoever talk about this all day. Just on the chance you know a good one, do you know any good conference talks or podcasts I can listen to on the same topic?

You can watch Herb Sutter talk about deferred_ptr: https://youtu.be/JfmTagWcqoE

But how can it Markit as dead as the mutatorthread runs?

It must stop the thread surely?

SGCL never stops the threads.

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