Definitely not. I don't think there many standard libraries that use syscalls for every lock. It is near universal to attempt a lock in user space (maybe even s

Definitely not. I don't think there many standard libraries that use syscalls for every lock. It is near universal to attempt a lock in user space (maybe even spin a few times) and only call the kernel if you need to wait. So low-contention locks should very rarely make a syscall.