do large c projects reinvent parts of c++?

for instance, does the linux kernel "reinvent" some c++-ish idioms?

also, it seems a lot of large projects are in c++. many games, every big name web browser, for instance.

if you were to, say, write chrome in c, would you naturally reinvent parts of c++?

>>1
Yes, for example in Linux kernel (written in C) threads are implemented from scratch. In C++ you could just #include <thread>.

>>12
I wonder why they don't even use POSIX threads. It's blatant NIH!