commit 78d7367c900114351348e5a1961dd6da58056b9f
author Harald Welte <laforge@osmocom.org> Tue Sep 29 11:32:35 2020 +0200
committer Harald Welte <laforge@osmocom.org> Tue Oct 26 17:16:50 2021 +0200
tree 79231c3fd0c33cf5d11e92e747737f98bea02a23
parent a0b57d06885572406943bc42884c2d189d541aee

logging: Attempt a synchronous, non-blocking write first (file, stderr)

In the old days, we performed synchronous, blocking writes to the log
file or stderr.  This was replaced by code that turned all log
file/stderr writes into non-blocking writes behind a write_queue.

This patch now introduces a further optimization: If we currently
don't have any log messages pending in the write queue, we are not
back-logged and assume we have a fair chance of writing the log message
right now, synchronously.  So we try that first, and only enqueue
the log message if the write fails (no bytes or insufficient number
of bytes written).

This way we should get the best of both worlds: No delay/re-ordering
(and lower select syscall load) for the "normal" case (benefits of
the old synchronous writes) while at the same time never risking to
block on log output.

Related: OS#4311
Change-Id: I08469a7e4be9bc5bbd39140457bb582f4a0b1703