API-MS-Win-Core-UMS-L1-1-0

All functions in the API-MS-Win-Core-UMS-L1-1-0 set are documented exports from KERNEL32, all new for version 6.1 and only exported from x64 builds:

• CreateUmsCompletionList
• CreateUmsThreadContext
• DeleteUmsCompletionList
• DeleteUmsThreadContext
• DequeueUmsCompletionListItems
• EnterUmsSchedulingMode
• ExecuteUmsThread
• GetCurrentUmsThread
• GetNextUmsListItem
• GetUmsCompletionListEvent
• QueryUmsThreadInformation
• SetUmsThreadInformation
• UmsThreadYield

The Windows 7 schema redirects this API Set to KERNEL32.