VideoPortReleaseSpinLockFromDpcLevel function (video.h)

Article
02/22/2024

The VideoPortReleaseSpinLockFromDpcLevel function releases the spin lock obtained by a previous call to VideoPortAcquireSpinLockAtDpcLevel.

Syntax

VIDEOPORT_API VOID VideoPortReleaseSpinLockFromDpcLevel(
  [in]      PVOID      HwDeviceExtension,
  [in, out] PSPIN_LOCK SpinLock
);

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.

Return value

None

Remarks

Miniport drivers call VideoPortReleaseSpinLockFromDpcLevel to release a spin lock acquired by calling VideoPortAcquireSpinLockAtDpcLevel.

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

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