Function lock

crates/vm/src/object/core.rs:458–469

(addr: usize)

    }

    pub(super) fn lock(addr: usize) -> WeakrefLockGuard {
        let idx = (addr >> 4) % NUM_WEAKREF_LOCKS;
        loop {
            if LOCKS[idx]
                .compare_exchange_weak(0, 1, Ordering::Acquire, Ordering::Relaxed)
                .is_ok()
            {
                return WeakrefLockGuard { idx };
            }
            core::hint::spin_loop();
        }
    }

    /// Reset all weakref stripe locks after fork in child process.
    /// Locks held by parent threads would cause infinite spin in the child.