VideoPortReleaseSpinLock - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// video.h

VIDEOPORT_API VOID VideoPortReleaseSpinLock(
  [in]      PVOID      HwDeviceExtension,
  [in, out] PSPIN_LOCK SpinLock,
  [in]      UCHAR      NewIrql
);
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Windows Driver Kit DDI reference (nf-video-videoportreleasespinlock)

VideoPortReleaseSpinLock function

Description

The VideoPortReleaseSpinLock function releases ownership of a given spin lock and restores the original IRQL at which the caller was running.

Parameters

HwDeviceExtension [in]

Pointer to the miniport driver's device extension.

SpinLock [in, out]

Pointer to a memory location that contains the spin lock to be released.

NewIrql [in]

Specifies the IRQL to be restored.

Return value

None

Remarks

This call is the inverse of VideoPortAcquireSpinLock. The NewIrql value must be the same as the value pointed to by OldIrql when VideoPortAcquireSpinLock returned.

Callers of VideoPortReleaseSpinLock must be running at IRQL = DISPATCH_LEVEL. On return from this routine, IRQL is restored to the NewIrql value.

See also

VideoPortAcquireSpinLock

View the official Windows Driver Kit DDI reference

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