Module iopipe.refc

Reference counting using the GC.

The RefCounted struct simply stores the item in a GC block, and also adds a root to that block. Once all known references to the block are removed (tracked by a reference count in the block), then the block is removed, and the destructor run. Since it's a root, it can run the full destructor of the data underneath, without worrying about GC data being collected underneath it.

This depends on the block not being involved in a cycle, which should be fine for iopipes.

Note that atomics are used for the reference count because the GC can destroy things in other threads.


refCounted(item) Return a ref counted version of the given item.


RefCounted A struct to ensure only one copy of the provided item exists.