C++ (Cpp) Waiter::Notify Examples

Example #1

File: test.cpp Project: annp/DesignPattern

//客户端
int main()
{
	//店里添加烤肉师傅、菜单、服务员等顾客
	Barbucer* barbucer=new Barbucer();
	Command* cmd= new BakeMuttonCmd(barbucer);
	Command* cmd2=new ChickenWingCmd(barbucer);
	Waiter* girl = new Waiter();
	//点菜
	girl->SetCmd(cmd);
	girl->SetCmd(cmd2);
	//服务员通知
	girl->Notify();
	system("pause");
	return 0;
}

Example #2

File: mutex.cpp Project: ancapdev/crunch.concurrency

void Mutex::Unlock()
{
    std::uint64_t head = 0;
    if (mWaiters.CompareAndSwap(head, MUTEX_FREE_BIT))
        return;

    ExponentialBackoff backoff;
    for (;;)
    {
        CRUNCH_ASSERT_MSG((head & MUTEX_FREE_BIT) == 0, "Attempting to release unlocked mutex");

        Waiter* headPtr = Detail::WaiterList::GetPointer(head);
        if (headPtr == nullptr)
        {
            CRUNCH_ASSERT((head & Detail::WaiterList::LOCK_BIT) == 0);

            // No waiters, attempt to set free bit.
            if (mWaiters.CompareAndSwap(head, MUTEX_FREE_BIT))
                return;
        }
        else if (head & Detail::WaiterList::LOCK_BIT)
        {
            // Wait for lock release.
            head = mWaiters.Load(MEMORY_ORDER_RELAXED);
        }
        else 
        {
            // Try to pop first waiter off list and signal
            std::uint64_t const newHead =
                Detail::WaiterList::SetPointer(head, headPtr->next) +
                Detail::WaiterList::ABA_ADDEND;

            if (mWaiters.CompareAndSwap(head, newHead))
            {
                headPtr->Notify();
                return;
            }
        }

        backoff.Pause();
    }
}