VideoPortReleaseDeviceLock - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// video.h
VIDEOPORT_API VOID VideoPortReleaseDeviceLock(
[in] IN PVOID HwDeviceExtension
);
View the official Windows Driver Kit DDI referenceNo description available.
The VideoPortReleaseDeviceLock function releases the device lock acquired in a prior call to VideoPortAcquireDeviceLock.
HwDeviceExtension [in]Pointer to the miniport driver's device extension.
None
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.