From: Rik van Riel <riel@surriel.com>
To: Rajat Jain <rajat.noida.india@gmail.com>
Cc: Rick Brown <rick.brown.3@gmail.com>,
kernelnewbies@nl.linux.org, linux-kernel@vger.kernel.org
Subject: Re: Spinlock query
Date: Wed, 30 Aug 2006 08:03:52 -0400 [thread overview]
Message-ID: <44F57EA8.4010905@surriel.com> (raw)
In-Reply-To: <b115cb5f0608292231r1a3c47c8r8980b32e838ff964@mail.gmail.com>
Rajat Jain wrote:
> On 8/30/06, Rik van Riel <riel@surriel.com> wrote:
>> Rick Brown wrote:
>> > Hi,
>> >
>> > In my driver (Process context), I have written the following code:
>> >
>> > --------------------------------------------
>> > spin_lock(lock)
>> > ...
>> > //Critical section to manipulate driver data
>>
>> ... interrupt hits here
>> interrupt handler tries to grab the spinlock, which is already taken
>> *BOOM*
>>
>> > spin_u lock(lock)
>> > ---------------------------------------------
>> >
>
> The interrupt handler TRIES to grab the spinlock, which is already
> taken. Why will it "BOOM"? Wouldn't the interrupt handler busy wait,
> waiting for the lock?
>
> Am I missing something here?
Yes, it will busy wait. Forever.
--
What is important? What you want to be true, or what is true?
next prev parent reply other threads:[~2006-08-30 12:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-30 2:12 Spinlock query Rick Brown
2006-08-30 2:12 ` Rick Brown
2006-08-30 3:10 ` Rik van Riel
2006-08-30 5:31 ` Rajat Jain
2006-08-30 6:04 ` Vin
2006-08-30 12:03 ` Rik van Riel [this message]
[not found] ` <fa2bedd60608292159ra9fce70wd1dbc8231d9c052c@mail.gmail.com>
2006-09-01 2:31 ` Rajat Jain
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