Q: signal on file descriptor from RT to non-RT thread

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I need to event-notify a non-RT thread with a poll(2) compatible mechanism from an RT thread, meaning the event must come via a file descriptor.

I cannot use eventfd() since there's no common parent process. 

what would be a low-overhead method on the RT thread side? writing a socket? a pipe? 
Or should I rather not bother about the cost of the operation to start with?

thanks in advance for any suggestions.

- Michael


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