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> Use this file to discover all available pages before exploring further.

# How to: Creating a manual task queue

> How to: Creating a manual task queue

## Example

You might want to explicitly control the threads that are used for task queue work and completions. In these
cases, create a *manual task queue* and dispatch the calls yourself. If you're using manual task queues,
you must ensure that they also pump the Windows message queue.

The following example shows how to create a manually pumped task queue. It creates two STL
threads that dispatch calls for both the work port and the completion port.

```c++ theme={null}
void CreatingTaskQueueWithManualThreads() 
{  
    // Create a manual task queue.  
    XTaskQueueHandle queue;  
  
    HRESULT hr = XTaskQueueCreate(  
        XTaskQueueDispatchMode::Manual,  
        XTaskQueueDispatchMode::Manual,  
        &queue);  
  
    if (FAILED(hr))  
    {  
        printf("Creating queue failed: 0x%x\r\n", hr);  
        return;  
    }  
  
    // We create threads to pump the queue: one thread for the work port  
    // and one thread for the completion port.  
    std::thread workThread([queue]  
    {  
        // XTaskQueueDispatch returns false when there's nothing to  
        // dispatch. Here, we wait forever for something new to come  
        // in. This will return false only if the queue is being  
        // terminated.  
        while (XTaskQueueDispatch(queue, XTaskQueuePort::Work, INFINITE));  
    });  
  
    std::thread completionThread([queue]  
    {  
        // XTaskQueueDispatch returns false when there's nothing to  
        // dispatch. Here, we wait forever for something new to come  
        // in. This will return false only if the queue is being  
        // terminated.  
        while (XTaskQueueDispatch(queue, XTaskQueuePort::Completion, INFINITE));  
    });  
  
    SubmitCallbacks(queue);  
  
    // Wait a while for the callbacks to run.  
    Sleep(1000);  
  
    // Terminating the queue will cause a waiting XTaskQueueDispatch to return  
    // false.  
    XTaskQueueTerminate(queue, true, nullptr, nullptr);  
  
    workThread.join();  
    completionThread.join();  
}  
```

## See also

[Designing the task queue](/build/core-features/common/async/async-task-queue-design)


## Related topics

- [Async task queue design](/build/core-features/common/async/async-task-queue-design.md)
- [How to: Creating a composite task queue](/build/core-features/common/async/async-task-queue-design-howto/creating-composite-task-queue.md)
- [How to: Creating a thread pool task queue](/build/core-features/common/async/async-task-queue-design-howto/creating-thread-pool-task-queue.md)
- [How to: Using events to control manual queue dispatching](/build/core-features/common/async/async-task-queue-design-howto/control-manual-queue-dispatching.md)
- [How to: Using the process task queue](/build/core-features/common/async/async-task-queue-design-howto/using-process-task-queue.md)