DPC for StartIo

[Sameer]

Hi all,

I am new member of this group.

Please let me know disadvantages, if any, for scheduling DPC for
StartIo.

Thanks in Advance,

Sameer

 

[Doron Holan [MS]]

StartIo is called at dispatch level IIRC, so why do you need to schedule
aDPC? for synchronization?

d

 

[Sameer]

If I have a custom IRP queue, and I call IostartNextPacket from my
Custom IRP queue's StartIo, then it is again going to call StartIo.
This may cause stack overflow.

So I think it will be better to have DPC.

Please clarify if I am wrong.

Sameer

 

[Doron Holan [MS]]

you are right, but you want to call IoSetStartIoAttributes with the 2nd
parameter as TRUE. this will prevent the recursion. this API is available
on XP and later.

d