Function spinlock_lock

thread/thread.cpp:1797–1799

        return ((mutex*)arg)->lock();
    }
    int spinlock_lock(void* arg) {
        return ((spinlock*)arg)->lock();
    }
    static int cvar_do_wait(thread_list* q, void* m, Timeout timeout, int(*lock)(void*), void(*unlock)(void*)) {
        assert(m);
        if (!m)