KeAcquireSpinLockAtDpcLevel - NtDoc
Native API online documentation, based on the System Informer
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headers
// wdm.h
VOID KeAcquireSpinLockAtDpcLevel(
[in, out] PKSPIN_LOCK SpinLock
);
View the official Windows Driver Kit DDI referenceNo description available.
The KeAcquireSpinLockAtDpcLevel routine acquires a spin lock when the caller is already running at IRQL >= DISPATCH_LEVEL.
SpinLock [in, out]Pointer to an initialized KSPIN_LOCK spin lock for which the caller must provide the storage. The spin lock must be from non-paged pool.
Drivers call KeAcquireSpinLockAtDpcLevel instead of KeAcquireSpinLock for better driver performance if and only if they are already running at an IRQL of DISPATCH_LEVEL or above.
If a driver is running at IRQL <= APC_LEVEL, it should call KeAcquireSpinLock to have IRQL raised by that routine. KeAcquireSpinLockAtDpcLevel assumes the caller is already running at IRQL >= DISPATCH_LEVEL, so no raise is necessary.
The caller should release the spin lock with KeReleaseSpinLockFromDpcLevel as quickly as possible.
For more information about spin locks, see Spin Locks.
KeAcquireInStackQueuedSpinLockAtDpcLevel
KeTryToAcquireSpinLockAtDpcLevel