The Wine project emulates the Windows API in user space. One particular part of that API, namely the NT synchronization primitives, have historically been implemented via RPC to a dedicated "kernel" process. However, more recent applications use these
APIs more strenuously, and the overhead of RPC has become a bottleneck.

The NT synchronization APIs are too complex to implement on top of existing primitives without sacrificing correctness. Certain operations, such as NtPulseEvent() or the "wait-for-all" mode of NtWaitForMultipleObjects(), require direct control over the
underlying wait queue, and implementing a wait queue sufficiently robust for Wine in user space is not possible. This proposed driver, therefore, implements the problematic interfaces directly in the Linux kernel.
↫ Elizabeth Figura on the lkml

This proposed driver would yield some serious performance results.

https://www.osnews.com/story/138451/windows-nt-synchronization-primitives-driver-for-the-linux-kernel-proposed/

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