Hi Sumant,
Unfortunately, the answer to the previous email thread you mentioned (i.e  
https://groups.google.com/forum/#!topic/grpc-io/NrrPOKEZbAU ) is still 
relevant.

There is currently no way to do that although in theory it should be 
possible to (by exposing the low-level/internal completion queue APIs i.e 
grpc_cq_begin_op() 
<https://github.com/grpc/grpc/blob/v1.18.0/src/core/lib/surface/completion_queue.h#L74>
 and grpc_cq_end_op() 
<https://github.com/grpc/grpc/blob/v1.18.0/src/core/lib/surface/completion_queue.h#L78>
 APIs 
via C++ wrappers).  There isn't a way to signal a condition variable either 

If possible, do create a ticket so that the team can triage it.

-Sree


On Wednesday, February 6, 2019 at 5:00:50 PM UTC-8, [email protected] wrote:
>
> Hi folks,
>
> I'm wondering if there's a way in grpc::CompletionQueue to insert events 
> dequeued from a non-grpc job queue? 
>
> I've two queues in my server: one grpc::CompleteQueue and another 
> unrelated internal queue. Currently, I'm polling both queues in the same 
> thread for availability of an event. It sort of busy loops. I would like to 
> have one stop for all event multiplexing. If there is a way to insert an 
> event into a grpc_completion_queue (with some tag) and retrieve it back out 
> from cq_.AsynNext, that would do the trick. Effectively, use 
> gprc_completion_queue as a pipe. Is this possible?
>
> A very similar question was discussed here: 
> https://groups.google.com/forum/#!topic/grpc-io/NrrPOKEZbAU Looks like 
> back in 2016 no such way existed.
>
> Alternatively, is there a way to notify a condition_variable upon 
> availability of an event in the grpc_completion_queue? The polling thread 
> would block simply block on the condition_variable and will subsequently 
> call cq.AsyncNext with zero timeout.
>
> Regards,
> Sumant
>

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