Understanding glibc source code conventions

Question

I\'ve been looking at some of the source code for glibc, in particular the nptl code, and I\'ve found it a little bit hard to understand since it seems to have conventions that

Answer 1

1. Old writing.
2. To ensure the type of __pthread_equal, pthread_equal to same.
3. To distinguish between variable names, and distinguish between core area and user area.