The manual page I've got does not say it is, but the implementation does
not wait for acknowledgment from the journal. The implementation does
not block explicitly, but I think the sendmsg call can block until the
receiver queue is empty.
The background for this question is that we have a feature request for a
non-blocking logging interface. I wonder if the journal fits this
requirement.
I assume that with “non-blocking”, the feature request submitter means
that the function does not block indefinitely, say due to a service
process outage. Memory allocations can take a fairly long time as well
(due to paging), but I think that doesn't count here.
Thanks,
Florian
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