If you look in the glibc source code in `sysdeps/unix/sysv/linux/arch-fork.h` you will see how it is calling clone BTW. In Linux really threads are just tasks

If you look in the glibc source code in `sysdeps/unix/sysv/linux/arch-fork.h` you will see how it is calling clone BTW. In Linux really threads are just tasks that share memory and processes are tasks that do not. fork() and pthread_create() simply end up in the same place because user threads or processes are just tasks to the kernel. Kernel threads, which are not user space are different. https://github.com/torvalds/linux/blob/master/include/linux/sched.h https://github.com/torvalds/linux/blob/master/include/linux/... The sched wouldn't be able to use a Red-Black trees in the way it does if it didn't