From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh workers <zsh-workers@zsh.org>
Subject: Re: typeset -F3 SECONDS doesn't work the first time
Date: Thu, 28 Jun 2012 15:00:35 -0700 [thread overview]
Message-ID: <120628150035.ZM28226@torch.brasslantern.com> (raw)
In-Reply-To: <CAHYJk3S=YsJrSKYcFCvm+yrH_f4Tuy_WkL2UWnqoj3L3xoc_eA@mail.gmail.com>
On Jun 28, 8:11pm, Mikael Magnusson wrote:
}
} Right, the fractional part was what I wanted to show. sleep in both
} pipelines can sleep for subsecond intervals, but afaik there's no
} builtin sleep command in zsh.
Hrm, dunno what I was thinking there except that I couldn't figure
out why you used =sleep in one example but not the other.
In any case init.c:setupvals() loads the shtimer global directly to
initialize SECONDS and then a bit later calls createparamtable() to
copy the environment, which goes through params.c:intsecondssetfn()
which resets shtimer.tv_sec and zeroes shtimer.tv_usec.
So this probably has to do with rounding error when converting shtimer
to double by typecast and division in params.c:floatsecondsgetfn().
Same thing happens without the code snippet from workers/30540 so that's
not involved.
prev parent reply other threads:[~2012-06-28 22:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-26 16:26 Mikael Magnusson
2012-06-27 17:50 ` Bart Schaefer
2012-06-27 17:58 ` Mikael Magnusson
2012-06-28 16:54 ` Bart Schaefer
2012-06-28 17:04 ` Mikael Magnusson
2012-06-28 18:06 ` Bart Schaefer
2012-06-28 18:11 ` Mikael Magnusson
2012-06-28 22:00 ` Bart Schaefer [this message]
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