Hi.

Currently, vim checks ended-job every 10 second; thus exit_cb is delayed
10 seconds at the maximum.

I propose the following:

https://gist.github.com/ichizok/fe9743f46822a9015ed2f7d65238c5db

os_unix: check by waitpid(-1, _, WNOHANG).
os_win32: check by WaitForMultipleObjects(),
"the number of active jobs" / MAXIMUM_WAIT_OBJECTS (==64) times.

They suppress the count of calling syscall to be nearly constant regardless
of the number of active jobs.

# I set MAX_ENDED_JOB_COUNT (the maximum number of detections
# in job_check_ended()) to 8, but this may require consideration.

Thank you.
- Ozaki Kiichi

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