westonpace commented on code in PR #40722:
URL: https://github.com/apache/arrow/pull/40722#discussion_r1546994167
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cpp/src/arrow/util/async_util.h:
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@@ -277,6 +278,8 @@ class ARROW_EXPORT ThrottledAsyncTaskScheduler : public
AsyncTaskScheduler {
/// Allows task to be submitted again. If there is a max_concurrent_cost
limit then
/// it will still apply.
virtual void Resume() = 0;
+ /// Return the number of tasks queued but not yet submitted
+ virtual std::size_t QueueSize() = 0;
Review Comment:
The implementation uses a `std::mutex` and so I'd have to mark the mutex
mutable right? Which would you prefer? "mutable mutex" or "non-const
accessor"? I don't have strong preference.
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