Function __cxa_guard_acquire

uspace/lib/cpp/src/__bits/runtime.cpp:135–140

    std::mutex static_guard_mtx{};

    extern "C" int __cxa_guard_acquire(guard_t* guard)
    {
        static_guard_mtx.lock();

        return !*((std::uint8_t*)guard);
    }

    extern "C" void __cxa_guard_release(guard_t* guard)
    {