buffer is not flushed when removing handler

[kalmarek]

I have the following usecase:

logger = basic_config("info")
add_handler(logger, DefaultHandler("temp.log"), "file-log")
info(logger, "some message")
out = STDOUT
err = STDERR
redirect_stdout(logger.handlers["file-log"].io)
redirect_stderr(logger.handlers["file-log"].io)
# run some calls to c libs which produce stuff to stdout (the stuff I want to capture in logfile)
remove_handler(logger, "file-log")
redirect_stdout(out)
redirect_stderr(err)

Messages are periodically flushed to temp.log, (asserted by tailfing it), however last lines are lost??
I tried flush(logger.handlers["file-log"].io) and info(solver_logger, "Finished!") just before the handler is removed to force it to flush the buffer, to no avail...

btw. is there a way to decrease time between flushes??

[kalmarek]

ok, so I figured it out: it's a matter of redirect_std|out|err:
Just before redirect_stdout(out) You need to call Base.Libc.flush_cstdio() to flush all C-buffers;

[rofinn]

Hmmm, that does seem like pretty awkward behaviour. Given that this appears to be more of a problem with base julia, it might be worth opening an issue here, or modifying the redirect_* methods to include the call to Base.Libc.flush_cstdio() and opening a PR.

[kalmarek]

Yeah, I found also this:
JuliaLang/julia#8765
I am not proficient enough to try to solve it...