> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# XTaskQueueRegisterMonitor

> XTaskQueueRegisterMonitor

# XTaskQueueRegisterMonitor

Registra um retorno de chamada que será invocado sempre que um retorno de chamada for enviado para esta fila.

## Sintaxe

```cpp theme={null}
HRESULT XTaskQueueRegisterMonitor(  
         XTaskQueueHandle queue,  
         void* callbackContext,  
         XTaskQueueMonitorCallback* callback,  
         XTaskQueueRegistrationToken* token  
)  
```

### Parâmetros

*queue*   \_In\_\
Tipo: XTaskQueueHandle

A fila na qual registrar o retorno de chamada de envio.

*callbackContext*   \_In\_opt\_\
Tipo: void\*

Um ponteiro de contexto opcional a ser passado para o retorno de chamada de envio.

*callback*   \_In\_\
Tipo: [XTaskQueueMonitorCallback\*](/pt-BR/reference/system/xtaskqueue/functions/xtaskqueuemonitorcallback)

Um retorno de chamada que será invocado quando um novo retorno de chamada for enviado para a fila.

*token*   \_Out\_\
Tipo: [XTaskQueueRegistrationToken\*](/pt-BR/reference/system/xtaskqueue/structs/xtaskqueueregistrationtoken)

Um token usado ao chamar [XTaskQueueUnregisterMonitor](/pt-BR/reference/system/xtaskqueue/functions/xtaskqueueunregistermonitor) para remover o retorno de chamada.

### Valor retornado

Tipo: HRESULT

Código de sucesso ou de erro HRESULT.

## Comentários

<Note>Não é seguro chamar esta função em um thread sensível ao tempo. Para obter mais informações, consulte [Threads sensíveis ao tempo](https://learn.microsoft.com/gaming/gdk/docs/gdk-dev/console-dev/overviews/threads/time-sensitive-threads).</Note>

O exemplo a seguir mostra como uma fila de tarefas pode ser usada para sinalizar uma variável de condição quando tiver itens a expedir. Um aplicativo pode usar isso para compartilhar os threads que usa para a fila de tarefas com outros trabalhos do aplicativo.

<Note>**SubmitCallback** é uma função auxiliar definida no exemplo de código da função [XTaskQueueSubmitCallback](/pt-BR/reference/system/xtaskqueue/functions/xtaskqueuesubmitcallback).</Note>

```cpp theme={null}
// We will use condition variables to signal when there is something for us 
// in the queue and a bool to signal when we want the whole thing to close.
// Keep all this in a struct for convenient access
struct QueueControl
{
    std::condition_variable workActivity;
    std::mutex workMutex;
    std::condition_variable completionActivity;
    std::mutex completionMutex;
    bool terminate = false;
} queueControl;

void CALLBACK TaskQueueNewItemSubmitted(void* context, XTaskQueueHandle, XTaskQueuePort port)
{
    // A new callback has been submitted. notify the correct condition variable
    QueueControl* queueControl = static_cast<QueueControl*>(context);
    switch (port)
    {
    case XTaskQueuePort::Work:
        queueControl->workActivity.notify_all();
        break;

    case XTaskQueuePort::Completion:
        queueControl->completionActivity.notify_all();
        break;
    }
}

void CreatingTaskQueueWithManualSignaling()
{
    // 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;
    }

    // Listen to callback submitted notifications to signal
    // our condition variable.
    XTaskQueueRegistrationToken token;
    hr = XTaskQueueRegisterMonitor(
        queue, &queueControl, 
        TaskQueueNewItemSubmitted, &token);

    std::thread workThread([&]()
    {
        std::unique_lock<std::mutex> lock(queueControl.workMutex);
        while (!queueControl.terminate)
        {
            queueControl.workActivity.wait(lock);
            XTaskQueueDispatch(queue, XTaskQueuePort::Work, 0);
        }
    });

    std::thread completionThread([&]()
    {
        std::unique_lock<std::mutex> lock(queueControl.completionMutex);
        while (!queueControl.terminate)
        {
            queueControl.completionActivity.wait(lock);
            XTaskQueueDispatch(queue, XTaskQueuePort::Completion, 0);
        }
    });

    SubmitCallbacks(queue);

    // Wait a while for the callbacks to run
    Sleep(1000);

    XTaskQueueTerminate(queue, true, nullptr, nullptr);

    queueControl.terminate = true;
    queueControl.workActivity.notify_all();
    queueControl.completionActivity.notify_all();

    workThread.join();
    completionThread.join();
}
```

## Requisitos

**Cabeçalho:** XTaskQueue.h

**Biblioteca:** xgameruntime.lib

**Plataformas compatíveis:** Windows, consoles da família XBOX One e consoles XBOX Series

## Documentação conceitual

* [Visão geral da biblioteca XTaskQueue](/pt-BR/build/core-features/common/async/async-libraries/async-library-xtaskqueue)
* [Threads sensíveis ao tempo](https://learn.microsoft.com/gaming/gdk/docs/gdk-dev/console-dev/overviews/threads/time-sensitive-threads)

## Confira também

[Membros de XTaskQueue](/pt-BR/reference/system/xtaskqueue/xtaskqueue_members)\
[Modelo de programação assíncrona](/pt-BR/build/core-features/common/async/async-programming-model)\
[Design da fila de tarefas assíncrona](/pt-BR/build/core-features/common/async/async-task-queue-design)


## Related topics

- [XTaskQueueRegisterMonitor](/reference/system/xtaskqueue/functions/xtaskqueueregistermonitor.md)
- [XTaskQueueUnregisterMonitor](/reference/system/xtaskqueue/functions/xtaskqueueunregistermonitor.md)
- [XTaskQueueMonitorCallback](/reference/system/xtaskqueue/functions/xtaskqueuemonitorcallback.md)