KefReleaseSpinLockFromDpcLevel function (wdm.h)
The KeReleaseSpinLockFromDpcLevel routine releases an executive spin lock without changing the IRQL.
Syntax
void KefReleaseSpinLockFromDpcLevel(
[in, out] PKSPIN_LOCK SpinLock
);
Parameters
[in, out] SpinLock
Pointer to an executive 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 |
|---|---|
| Minimum supported client | Available starting with Windows 2000. |
| 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(wdm), SpinLock(wdm), SpinlockRelease(wdm), SpinLockSafe |