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VideoPortReleaseSpinLock function (video.h)

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

Syntax

VIDEOPORT_API VOID VideoPortReleaseSpinLock(
  [in]      PVOID      HwDeviceExtension,
  [in, out] PSPIN_LOCK SpinLock,
  [in]      UCHAR      NewIrql
);

Parameters

[in] HwDeviceExtension

Pointer to the miniport driver's device extension.

[in, out] SpinLock

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

[in] NewIrql

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.

Requirements

Requirement Value
Minimum supported client Available in Windows XP and later versions of the Windows operating systems.
Target Platform Desktop
Header video.h (include Video.h)
Library Videoprt.lib
DLL Videoprt.sys
IRQL DISPATCH_LEVEL (see Remarks section)

See also

VideoPortAcquireSpinLock