He doesn’t talk about it there, but this is the same Xavier Leroy who wrote LinuxThreads, the default POSIX Threads implementation on Linux up to 2.6.

C is a deceptive language. At that time, I had been programing in C for 20 years so I thought I knew it. No. I only knew the little subset that I routinely used. I’m still discovering bizarre clauses in the C standards.

I just want to highlight this bit in case anyone comes along and only reads the comments, not the full interview.