Usually we have a loop calling Next and when we are sure there will be no
more work adding to the completion queue we call completion queue's
Shutdown method to shutdown the queue.
It will in turn cause the Next to return false and it can be used to break
out of the loop.
The ok parameter is an indication of the success of that particular
operation and usually is not related to the cq life time management.
On Monday, July 10, 2017 at 2:32:37 AM UTC-7, Przemysław Sobala wrote:
>
> Hello
> What is the difference between method's
> bool CompletionQueue::Next(void** tag, bool* ok)
> return value and 2nd parameter's value?
>
> Reading docs, it says:
> /// \param ok[out] true if read a regular event, false otherwise.
> /// \return true if read a regular event, false if the queue is shutting
> down
>
> Following the example:
> while (true) {
> // Block waiting to read the next event from the completion queue.
> The
> // event is uniquely identified by its tag, which in this case is the
> // memory address of a CallData instance.
> // The return value of Next should always be checked. This return
> value
> // tells us whether there is any kind of event or cq_ is shutting
> down.
> GPR_ASSERT(cq_->Next(&tag, &ok));
> GPR_ASSERT(ok);
> static_cast<CallData*>(tag)->Proceed();
> }
> it breaks whether the return value or ok parameter is false.
> But in the production environment maybe I can break the loop when the
> queue is shutting down (based on return value) and continue when ok
> parameter's value is false?
> What is the most preferable approach? Should I consider both of them as
> the same and break on false as in the example?
>
> --
> regards
> Przemysław Sobala
>
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