// d3dkmthk.h

typedef enum _D3DKMT_QUERYRESULT_PREEMPTION_ATTEMPT_RESULT {
  D3DKMT_PreemptionAttempt,
  D3DKMT_PreemptionAttemptSuccess,
  D3DKMT_PreemptionAttemptMissNoCommand,
  D3DKMT_PreemptionAttemptMissNotEnabled,
  D3DKMT_PreemptionAttemptMissNextFence,
  D3DKMT_PreemptionAttemptMissPagingCommand,
  D3DKMT_PreemptionAttemptMissSplittedCommand,
  D3DKMT_PreemptionAttemptMissFenceCommand,
  D3DKMT_PreemptionAttemptMissRenderPendingFlip,
  D3DKMT_PreemptionAttemptMissNotMakingProgress,
  D3DKMT_PreemptionAttemptMissLessPriority,
  D3DKMT_PreemptionAttemptMissRemainingQuantum,
  D3DKMT_PreemptionAttemptMissRemainingPreemptionQuantum,
  D3DKMT_PreemptionAttemptMissAlreadyPreempting,
  D3DKMT_PreemptionAttemptMissGlobalBlock,
  D3DKMT_PreemptionAttemptMissAlreadyRunning,
  D3DKMT_PreemptionAttemptStatisticsMax
} D3DKMT_QUERYRESULT_PREEMPTION_ATTEMPT_RESULT;
View the official Windows Driver Kit DDI reference