Module counter 

Counter IPC Object

This module provides a counter-based IPC mechanism similar to Linux’s eventfd. Multiple file descriptors can share the same counter state (for dup/fork).

Behavior:

• read(8 bytes): Returns counter value and resets to 0 (or decrements by 1 in semaphore mode)
• write(8 bytes): Adds value to counter

Structs

Counter

Counter object for eventfd-like IPC

CounterState 🔒

Internal state of a counter

SharedCounterData 🔒

Shared counter data including state and wakers

Traits

CounterObject

Counter-specific operations trait