[pso] pso Digest, Vol 29, Issue 10

[Stefan Cristian]

Bun. Pot in cazul asta sa aloc memorie pentru  o structura work_struct in functia  bio_handler, o initializez si o schedulez. Sper ca nu este o intrebare prosteasca dar cine se ocupa de eliberarea memoriei pentru structura asta dupa ce este folosita? (nu imi este clar)

Mersi,
Stefan Cristian

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Today's Topics:

   1. Tema3: Despre sincronizare (Stefan Cristian)
   2. Re: Tema3: Despre sincronizare (Razvan Deaconescu)


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Message: 1
Date: Wed, 30 Jul 2008 13:47:24 +0000 (GMT)
From: Stefan Cristian <cristinutu122 at yahoo.fr>
Subject: [pso] Tema3: Despre sincronizare
To: pso at cursuri.cs.pub.ro
Message-ID: <645831.37223.qm at web25504.mail.ukl.yahoo.com>
Content-Type: text/plain; charset="us-ascii"

Salut

Am inregistrat o rutina de tratare a cererilor la nivel de  bio cu "blk_queue_make_request" (se numeste "bio_handler").  Aici am facut un singur apel la functia schedule_work(). Iar in handlerul asociat workqueue-ului vreau sa fac tot ce tine de prelucrarea bio-urilor si apelez la sfarsit bio_endio. E bun algoritmul? Trebuie sa mai fac sincronizari suplimentare cu functia bio_handler? 
Eu pasez bio-ul prin intermediul unei variabile globale pe care o setez in functia bio_handler si nu vreau sa isi modifice valoarea in timpul procesarii.

Mersi
Stefan Cristian


      
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Message: 2
Date: Wed, 30 Jul 2008 20:56:03 +0300
From: Razvan Deaconescu <razvan.deaconescu at cs.pub.ro>
Subject: Re: [pso] Tema3: Despre sincronizare
To: Proiectarea Sistemelor de Operare <pso at cursuri.cs.pub.ro>
Message-ID: <1217440563.8505.48.camel at valhalla.cs.pub.ro>
Content-Type: text/plain

On Wed, 2008-07-30 at 13:47 +0000, Stefan Cristian wrote:
> Salut
> 
> Am inregistrat o rutina de tratare a cererilor la nivel de  bio cu
> "blk_queue_make_request" (se numeste "bio_handler").  Aici am facut un
> singur apel la functia schedule_work(). Iar in handlerul asociat
> workqueue-ului vreau sa fac tot ce tine de prelucrarea bio-urilor si
> apelez la sfarsit bio_endio. E bun algoritmul? Trebuie sa mai fac
> sincronizari suplimentare cu functia bio_handler? 
> Eu pasez bio-ul prin intermediul unei variabile globale pe care o
> setez in functia bio_handler si nu vreau sa isi modifice valoarea in
> timpul procesarii.

Nu e OK sa mentii o variabila globala in care sa stochezi bio. Daca vine
o alta cerere ti-o va suprascrie. De ce nu o transmiti ca argument in
work_struct?

Razvan



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