PPL任务何时在UI线程上执行? [英] When does a PPL task execute on the UI thread?

问题描述

调用create_task时，是否有办法确保该任务不在UI线程上运行?

When calling create_task is there a way to ensure that the task doesn't run on the UI thread?

我想确保我不会在某种程度上设法在UI线程上执行的任务中意外调用wait.

I want to be sure I'm not inadvertently calling wait inside a task that somehow managed to execute on the UI thread.

推荐答案

create_task函数不会自发跳转到UI线程:如果不从UI线程调用它，它将无法在其中执行.您需要显式调用Dispatcher才能返回.

The create_task function won't spontaneously jump onto the UI thread: if you don't call it from the UI thread it won't execute there. You need to explicitly call the Dispatcher to get back.

默认情况下，如果未提供task_continuation_context来告知公寓的任务(返回IAsyncAction或IAsyncOperation的任务)将继续在其公寓中继续进行.在UI线程上启动任务的常见情况将在UI线程上继续.

An apartment aware task (one which returns IAsyncAction or IAsyncOperation) will continue in its apartment by default if a task_continuation_context isn't provided to tell it otherwise. The common case of starting a task on a UI thread will continue on the UI thread.

请参阅MSDN 异步的管理线程上下文"部分有关更多详细信息，请参见C ++ 文档中的编程.

See the Managing the thread context section of MSDN's Asynchronous programming in C++ docs for more details.

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