VideoPortEnableInterrupt function

Description

The VideoPortEnableInterrupt function is obsolete and should not be called.

The VideoPortEnableInterrupt function reenables interrupts from a video adapter after a call to VideoPortDisableInterrupt.

Parameters

HwDeviceExtension

Pointer to the miniport driver's device extension.

Return value

If VideoPortEnableInterrupt succeeds, it returns NO_ERROR. Otherwise, it returns ERROR_INVALID_FUNCTION.

Remarks

If you need to disable interrupts for the display adapter, write hardware-specific code to prevent the display adapter from generating interrupts. To subsequently enable interrupts, write hardware-specific code to allow the display adapter to resume generating interrupts.

You should not call VideoPortDisableInterrupt or VideoPortEnableInterrupt for the following reasons:

• Can disable interrupts for other devices that share an interrupt vector with the display adapter.
• Disables interrupts only on the processor where the current thread is running. On a multiprocessor computer, the display adapter can still interrupt another processor.
• On a multiprocessor machine, a call to VideoPortEnableInterrupt might run on a different processor than the previous corresponding call to VideoPortDisableInterrupt. In that case, interrupts will remain disabled for the processor on which VideoPortDisableInterrupt ran.

If the video miniport driver has not registered an HwVidInterrupt routine for the display adapter, VideoPortEnableInterrupt returns ERROR_INVALID_FUNCTION.

See also

HwVidInterrupt

HwVidSynchronizeExecutionCallback

VIDEO_HW_INITIALIZATION_DATA

VideoPortDisableInterrupt