[nginx] two masters exist

[洪志道]

Hi!

It's possible that two masters exist at the same time.

kill -USR2 pid;
sleep(2);
if [ -f ${oldbinpidfile} -a -f ${pidfile} ];
  # New master doesn't success in two seconds
  kill -QUIT oldpid;
fi

We assume that the previous exist master is old,
I want to know which master process the request that's accepted,
maybe I can design the variable $master with value old or new.
Is it possible to implement?

Thanks!
B.R.
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