Just to remove your uncertainty: a wall clock second is a common ordinary second. The warnings about the inaccuracy of alarm are due to resolution. It would be similar to you trying to time something with a digital watch that reads only to seconds. You cannot tell where you are in the current second, so your accuracy can be off by nearly a second.

In reply to Re: Tk related -- timed event and $SIG{ALRM} by rir
in thread Tk related -- timed event and $SIG{ALRM} by snafu

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