KeReleaseSpinLockFromDpcLevel macro (wdm.h)

The KeReleaseSpinLockFromDpcLevel routine releases an executive spin lock without changing the IRQL.

Syntax

VOID KeReleaseSpinLockFromDpcLevel(
  [in, out] PKSPIN_LOCK SpinLock
);

Parameters

[in, out] SpinLock

Pointer to an executive KSPIN_LOCK spin lock for which the caller provides the storage.

Return value

None

Remarks

Drivers call KeReleaseSpinLockFromDpcLevel to release a spin lock acquired by calling KeAcquireSpinLockAtDpcLevel.

It is an error to call KeReleaseSpinLockFromDpcLevel if the specified spin lock was acquired by calling KeAcquireSpinLock because the caller's original IRQL is not restored, which can cause deadlocks or fatal page faults.

For more information about spin locks, see Spin Locks.

Requirements

Requirement	Value
Target Platform	Universal
Header	wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library	NtosKrnl.lib
DLL	NtosKrnl.exe
IRQL	DISPATCH_LEVEL
DDI compliance rules	HwStorPortProhibitedDDIs(storport), IrqlDispatch(storport), SpinLockSafe(storport)

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Last updated on 2025-05-23