[pso] [Tema 2] [Windows] KeSetEvent

[Razvan Deaconescu]

On Fri, 2008-04-25 at 16:13 +0300, Marius Nicolae wrote:
> 2008/4/25 Razvan Deaconescu <razvand at cs.pub.ro>:
> > On Thu, 2008-04-24 at 22:11 +0300, Andrei Ciuca wrote:
> >  > Salut,
> >  >
> >  > Se poate apela "KeSetEvent" din handlerul intreruperii ?
> >
> >  Din documentatia KeSetEvent[1]: the caller can be running at IRQL <=
> >  DISPATCH_LEVEL.
> >
> >  Mai multe informatii despre IRQL puteti afla aici[2].
> >
> >  Concluzia este ca nu puteti folosi KeSetEvent dintr-un handler de
> >  intrerupere. Va trebui sa planificati un DPC pentru acest lucru.
> 
> Si daca punem FALSE pentru campul de wait, putem sa folosim KeSetEvent
> din handlerul de intrerupere?
> 
> "If Wait is set to FALSE, the caller can be running at IRQL <=
> DISPATCH_LEVEL. Otherwise, callers of KeSetEvent must be running at
> IRQL = PASSIVE_LEVEL and in a nonarbitrary thread context."

"the caller can be running at IRQL <= DISPATCH LEVEL"

IRQL == PASIVE == 0       -> context proces
IRQL == APC == 1          -> asynchronous procedure call
IRQL == DISPATCH == 2     -> DPC (deferred procedure call)

IRQL <= DISPATCH_LEVEL inseamna IRQL <= 2

O rutina de tratare a unei intreruperi hardware ruleaza la IRQL > 2.

Ai parcurs al doilea link[1] trimis de mine in mesajul anterior? O
propozitie din acel articol spune:
--
The IRQL values are divided into two groups: Software ( 0,1,2 ) /
Hardware IRQL ( >= 3)
--

Razvan

[1] http://ext2fsd.sourceforge.net/documents/irql.htm


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