Function prepare_switch

thread/thread.cpp:740–745

    static void spinlock_unlock(void* m_);

    inline void prepare_switch(thread* from, thread* to) {
        assert(from->vcpu == to->vcpu);
        assert(to->state == states::RUNNING);
        auto& cnt = to->get_vcpu()->switch_count;
        (*(uint64_t*)&cnt)++;   // increment of volatile variable is deprecated
    }

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Winvalid-offsetof"