SynchronizedLazyImpl - LazyThreadSafetyMode.SYNCHRONIZED

05_SynchronizedLazyImpl.kt

// simplified
override val value: T
    get() {
        if (_value !== UNINITIALIZED_VALUE) {
            return _value as T // Fast path: no lock needed
        }
        return synchronized(lock) {
            if (_value !== UNINITIALIZED_VALUE) {
                _value as T // Second check inside lock
            } else {
                val typedValue = initializer!!()
                _value = typedValue
                initializer = null
                typedValue
            }
        }
    }