[Warning: UMDF 2 is the latest version of UMDF and supersedes UMDF 1. All new UMDF drivers should be written using UMDF 2. No new features are being added to UMDF 1 and there is limited support for UMDF 1 on newer versions of Windows 10. Universal Windows drivers must use UMDF 2. For more info, see Getting Started with UMDF.]
The SetPolicy method specifies the interrupt priority, processor affinity, and affinity policy for a specified interrupt.
void SetPolicy( [in] WDF_INTERRUPT_POLICY Policy, [in] WDF_INTERRUPT_PRIORITY Priority, [in] KAFFINITY TargetProcessorSet );
A WDF_INTERRUPT_POLICY-typed enumerator that specifies a processor affinity policy for the interrupt.
A WDF_INTERRUPT_PRIORITY-typed enumerator that specifies a priority for the interrupt.
A KAFFINITY-typed value that specifies a processor affinity for the interrupt, if the Policy parameter is set to WdfIrqPolicySpecifiedProcessors.
This method does not return a value.
Starting in Windows Vista, drivers can specify an interrupt's priority, processor affinity, and affinity policy. For more information about how to use the registry to override the values that SetPolicy sets, see Interrupt Affinity and Priority.
If a driver is running on an operating system version that is earlier than Windows Vista, the framework ignores the values that the driver specifies when it calls SetPolicy.
For more information about registry values and INF sections that specify an interrupt's priority, processor affinity, and affinity policy, see Interrupt Affinity and Priority.
For more information about handling interrupts in UMDF drivers, see Accessing Hardware and Handling Interrupts.
The following code example assigns a device interrupt to processor 0, with normal priority.
#define AFFINITY_MASK(n) ((ULONG_PTR)1 << (n)) pIWdfInterrupt->SetPolicy( WdfIrqPolicySpecifiedProcessors, WdfIrqPriorityNormal, AFFINITY_MASK(0) );
|End of support||Unavailable in UMDF 2.0 and later.|
|Minimum UMDF version||1.11|