VideoPortReleaseDeviceLock function (video.h)
The VideoPortReleaseDeviceLock function releases the device lock acquired in a prior call to VideoPortAcquireDeviceLock.
Syntax
VIDEOPORT_API VOID VideoPortReleaseDeviceLock(
[in] IN PVOID HwDeviceExtension
);
Parameters
[in] HwDeviceExtension
Pointer to the miniport driver's device extension.
Return value
None
Remarks
Typically, the video port driver guarantees threaded synchronization into the miniport driver by using of a device lock. However, a miniport driver must perform its own synchronization when being accessed by a child device; that is, a miniport driver must perform synchronization in routines that it exposes through HwVidQueryInterface. The miniport driver does this by calling VideoPortAcquireDeviceLock to acquire the device lock maintained by the video port driver.
The miniport driver should call VideoPortReleaseDeviceLock to release the device lock as quickly as possible.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 2000 and later versions of the Windows operating systems. |
| Target Platform | Desktop |
| Header | video.h (include Video.h) |
| Library | Videoprt.lib |
| DLL | Videoprt.sys |
| IRQL | PASSIVE_LEVEL |
See also
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