With Wine 10.15 expected to be released next Friday there will be initial support for using the
NTSYNC driver found within the Linux kernel.
Since the upstream Linux 6.14 kernel release
the NTSYNC kernel driver has been ready for better emulating the Windows NT synchronization primitives within the kernel to help upstream Wine and downstreams like various flavors of Proton.
There had been
this merge request open the past seven months for using the Linux NTSYNC driver for in-process synchronization.
While that merge request remains "open"