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From: Roman Perepelitsa <roman.perepelitsa@gmail.com>
Date: Sat, 27 Jun 2020 19:12:46 +0200
Message-ID: <CAN=4vMo61Q0unbW6EMJAGmu3k-bUtzvdNWKgfvxAJQ4D-FxDaA@mail.gmail.com>
Subject: Re: [BUG] zsystem:34: flock: invalid timeout value: '0'
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Cedric Ware <cedric.ware__bml@normalesup.org>, Daniel Shahaf <d.s@daniel.shahaf.name>, 
	Sebastian Gniazdowski <sgniazdowski@gmail.com>, Zsh hackers list <zsh-workers@zsh.org>
Content-Type: text/plain; charset="UTF-8"

On Sat, Jun 27, 2020 at 7:01 PM Bart Schaefer <schaefer@brasslantern.com> wrote:
>
> On Sat, Jun 27, 2020 at 12:27 AM Roman Perepelitsa <roman.perepelitsa@gmail.com> wrote:
>>
>> Timeout strictly between 0 and 1 microsecond is not much different
>> from timeout between 1 and 2 microseconds. You can either round up or
>> down in both cases. Rounding up is the right thing to do for sleeps
>> and timeouts because it allows you to provide a guarantee.
>
> I would be mildly surprised if this doesn't happen as part of the OS implementation of the operation.

I've a tendency to use an overly direct language that's often
perceived by others (especially Americans) as aggressive. Perhaps I
was overcautious this time. Let me try again.

Any implementation of sleep or timeout must round up. flock in zsh
doesn't round up but it must.

Roman.