Icicle\Concurrent\Sync\SharedMemoryParcel::isFreed PHP Method

    public function isFreed() : bool
    {
        // If we are no longer connected to the memory segment, check if it has
        // been invalidated.
        if ($this->handle !== null) {
            $this->handleMovedMemory();
            $header = $this->getHeader();
            return $header['state'] === static::STATE_FREED;
        }
        return true;
    }