In-Stack queued spin lock & NDIS

NTDEV
1

Hi,

As we all now, we can use in our code both ‘Spin lock’ and ‘In-Stack queued
spin lock’ in our code using
KeAcquireSpinLock() & KeAcquireInStackQueuedSpinLock() API functions
correspondingly.

When we write code in NDIS environment we use ‘NDIS spin lock’ and use
NdisAcquireSpinLock() API

I didn’t find any documentation regarding ‘In-Stack queued spin lock’ in
NDIS.

  1. Is there something like this in NDIS?
  2. Are there any plans to add such implementation?

Thanks!

2
  1. there does not appear to be an equivalent
  2. I don’t think so, but that shouldn’t stop you from using the WDM in stack queued spinlock though. Remember though that the KLOCK_QUEUE_HANDLE must be a unique address per thread which is attempting to acquire the lock, e.g. a value on the stack. This means that you cannot put a KLOCK_QUEUE_HANDLE into a common structure that more then one thread will use to acquire the lock, essentially the pattern of putting the spinlock and the IRQL into a NDIS_SPIN_LOCK that everybody uses cannot be used for the an instack queued spin lock (hence the “in stack” part of the name)

d

3

Hi Doron,

I do aware to the unique thread address/NOT use the common structure - I already been hit from that mistake some years ago.
I just thought that the NDIS_SPIN_LOCK might have the advanced in-stack as well.

Thanks anyway