Jamm\Memory\Shm\MultiAccess::acquire_writers_mutex PHP Method

    protected function acquire_writers_mutex()
    {
        if (!$this->mutex_acquired) {
            if (empty($this->writers_mutex)) {
                $this->writers_mutex = sem_get($this->writers_mutex_key, 1, 0777, 1);
            }
            if (empty($this->writers_mutex)) {
                return false;
            }
            ignore_user_abort(true);
            //don't hang with semaphore, please :)
            set_time_limit(30);
            if (!sem_acquire($this->writers_mutex)) {
                $this->err_log[] = 'Can not acquire writers mutex';
                return false;
            }
            $this->mutex_acquired = true;
        }
        return true;
    }