使用TBB进行非并行任务 [英] using TBB for non-parallel tasks

问题描述

我想使用TBB获得线程池行为.但是，每当我阅读有关TBB的文档时，他们总是谈论并发，并发等.相反，我需要的是一个主线程，将任务分配给线程池，以便这些任务将独立"执行-执行任务异步地.此处的任务可以是GUI的事件处理.

I want to get a thread-pool behavior using TBB. But whenever I read documents about TBB they always talk about parallel-for, parallel-dowhile etc. In contrast what I need is a main thread to assign tasks to a thread pool so those tasks will be executed 'on their own' - execute tasks asynchronously. Tasks here can be event handling for a GUI.

TBB任务计划程序是否适合这种行为?从任务计划程序获得的印象是，只有当我具有可以分解并彼此并行执行的任务时，这才是有益的.

Is the TBB task scheduler appropriate for such behavior? The impression I got from task scheduler is that it's only beneficial if I have tasks that can be broken down and executed in parallel to each other.

推荐答案

从版本3.0开始，TBB支持异步执行任务.为此，添加了一种特殊的工作提供方法tbb::task::enqueue().与tbb::task::spawn()不同，此方法保证即使始发线程从不输入任务分配方法(例如wait_for_all())，也将执行排队的任务.

Starting from version 3.0, TBB has support for asynchronous execution of tasks. For that, a special work offering method tbb::task::enqueue() was added. Unlike tbb::task::spawn(), this method guarantees that the enqueued task will be executed even if the originating thread never enters a task dispatch method such as wait_for_all().

task::enqueue()的简短用法示例:

class MyTask : public tbb::task {
    /*override*/ tbb::task* execute() {
        // Do the job
        return NULL; // or a pointer to a new task to be executed immediately
    }
};

MyTask* t = new (tbb::task::allocate_root()) MyTask();
tbb::task::enqueue(*t);
// Do other job; the task will be executed asynchronously

如注释中提到的@JimMishell，可以在设计模式"中找到如何使用它来处理GUI事件的示例.并且该方法的正式说明可在参考手册中找到(两者均请参见 TBB文档).

As @JimMishell mentioned in the comment, an example how to use it for handling of GUI events can be found in "Design Patterns"; and the formal description of the method is available in the Reference manual (see TBB documentation for both).

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