Function kill_worker

src/core/impl/system.cpp:576–585

    }

    void kill_worker() override {
        if (m_worker_pid) {
            CHECK_SYS_ERR(kill(m_worker_pid, SIGKILL));
            auto w = waitpid(m_worker_pid, nullptr, 0);
            CHECK_SYS_ERR(w);
            mgb_assert(w == m_worker_pid);
            m_worker_pid = 0;
            clear_sock_fd();
        }
    }

public:
    ~TimedFuncInvokerImpl() {