What is a task queue in chrome

[18楼梦想改造家]

Hey, I read the document.  Chromium Docs - Threading and Tasks in Chrome (googlesource.com).

And found this:

> Note that SequencedTaskRunner::GetCurrentDefault() returns the default queue for the current virtual thread. On threads with multiple task queues (e.g. BrowserThread::UI) this can be a different queue than the one the current task belongs to. 

If I don't misunderstand anything:

OneThread==>task1->task2->task3 queue_a
                 ||
                 ==> task4->task5     queue_b

If we at task4 to call `|GetCurrentDefault|`, and `|queue_a|` is the default queue. we will return `|queue_a|` instead of `|queue_b|`. That't what the document want to say, Does I understand this right? or not.

And another question is , in chormium, which class map to `|queue_a|` and `|queue_b|`. Thx.

[Min Qin]

GetCurrentDefault() just returns a TaskRunner, so the queue you mentioned depends on the actual implementation in the TaskRunner (thread pool, single thread, etc).  For example, base/task/sequence_manager/lazily_deallocated_deque.h 

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