All functions in the API-MS-Win-Core-ThreadPool-L1-1-0 set are exports from KERNEL32:

For the following functions, the implementations in KERNEL32 version 6.1 and higher are just stubs which transfer the handling to wherever the schema redirects the API Set:

For all others, notably including all whose names contain Threadpool, KERNEL32 either forwards to a corresponding NTDLL function or has a more or less substantial implementation whose essence is to call a corresponding NTDLL function.

New Locations

For each function that KERNEL32 version 6.1 transfers to the API Set, a non-trivial implementation is exported from KERNELBASE version 6.1 and higher.

The other functions are also exported from KERNELBASE version 6.1 and higher, but by reproducing the KERNEL32 handling in terms of NTDLL functions.

Schema Redirection

The Windows 7 schema redirects this API Set to KERNELBASE. Thus: