SHARED

Indicates that instances of the descriptor are immutable and shared. An object that is shared may have more than one reference and may be reachable by multiple fibers. Modules, methods, message bundle trees, and special atoms begin existence in the shared state. A fiber begins existence shared only if the parent fiber retains a reference to the new child. The origin function of a new fiber becomes shared before its execution. All special objects and other root objects begin existence shared. Other objects become shared just before assignment to the object slot of a shared object.