VideoPortReleaseSpinLockFromDpcLevel function (video.h)
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 |