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https://en.wikipedia.org/wiki/Thread_%28computing%29#1:1_.28...: 1:1 (kernel-level threading)

Threads created by the user in a 1:1 correspondence with schedulable entities in the kernel[10] are the simplest possible threading implementation. OS/2 and Win32 used this approach from the start, while on Linux the usual C library implements this approach (via the NPTL or older LinuxThreads). This approach is also used by Solaris, NetBSD, FreeBSD, OS X, and iOS.

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It's also worth noting that FreeBSD used to rely on M:N threading model (via libkse) then switched to 1:1 threading model (via libthr).

Though LinuxThreads was M:N, and Solaris migrated to 1:1 relatively recently too (as did others).

No, LinuxThreads was 1:1. Maybe you are thinking of IBM's NGPT proposal?

http://www.onlamp.com/pub/a/onlamp/2002/11/07/linux_threads....

"Relatively recently" would be Solaris 8, in 2000.

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