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Today's Topics:
1. Re: Restarting NUT twice in the same time creates 2 instances
of usbhid-ups driver (Arjen de Korte)
--
Message: 1
Date: Thu, 23 Jun 2011 11:53:46 +0200
From: Arjen de Korte
To: nut-upsuser@lists.alioth.debian.org
Subject: Re: [Nut-upsuser] Restarting NUT twice in the same time
creates 2 instances of usbhid-ups driver
Message-ID:
<20110623115346.horde.iprfxuisjlfoaw0q00qn...@mail.de-korte.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed; DelSp=Yes
Citeren Rapha?l:
When reading /etc/init.d/nut, i see that when restarting nut, script
stop nut and start it again.
When starting again the driver is one more time started without any
verification that its already launched.
Stopping a driver is an asynchronous process. So you either have to
check if the PID file is removed before assuming the driver has
actually stopped or you need to wait a couple of seconds before
(re)starting the drivers.
I think there is a problem in code there.
This is an inherent effect of the method that is used to signal
drivers to stop. On systems with multiple driver instances, you don't
want to hang around waiting for a driver to actually stop before going
to the next one.
have you a solution to bypass this problem without rewriting /etc/init.d/nut
The easiest fix is to add a delay between
stop nut
sleep 2
start nut
Best regards, Arjen
Testing PID before launching a new instance of driver is a good solution
but need to be implemented in /etc/init.d/nut
The sleep solution is incorrect because if i do in parallel twice
(stop,sleep,start). The two starts will be done at the same time ( i
mean stop will be already done) and there will be 2 instance of driver.
Or i dont understand.
Testing PID before and launching new instance of driver if pid does not
exist) sould be the right solution but only if 2 UPS needs 1 driver
else this solution fails
Regards.
--
Raphaël
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