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++?

>>12,15
So they could just magically use threads without a threading environment? How is the kernel supposed to use pthreads when it doesn't run even run in a POSIX environment?