Today (Saturday) We will make some minor tuning adjustments to MySQL.

You may experience 2 up to 10 seconds "glitch time" when we restart MySQL. We expect to make these adjustments around 1AM Eastern Daylight Saving Time (EDT) US.

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FreeBSD 11.0 - man page for sigsetmask (freebsd section 2)

SIGSETMASK(2)						      BSD System Calls Manual						     SIGSETMASK(2)

sigsetmask, sigblock -- manipulate current signal mask
Standard C Library (libc, -lc)
#include <signal.h> int sigsetmask(int mask); int sigblock(int mask); int sigmask(int signum);
This interface is made obsolete by: sigprocmask(2). The sigsetmask() function sets the current signal mask to the specified mask. Signals are blocked from delivery if the corresponding bit in mask is a 1. The sigblock() function adds the signals in the specified mask to the current signal mask, rather than overwriting it as sigsetmask() does. The macro sigmask() is provided to construct the mask for a given signum. The system quietly disallows SIGKILL or SIGSTOP to be blocked.
The sigblock() and sigsetmask() functions return the previous set of masked signals.
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigvec(2), sigsetops(3)
The sigsetmask() and sigblock() functions first appeared in 4.2BSD and have been deprecated.
June 2, 1993 BSD

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