Re: clone() and CLONE_PID

[Matthew Kirkwood]

On Tue, 7 Sep 1999, Lorenzo Allegrucci wrote:

> This is from the LinuxThreads README file:

>   One thing that they do not share
>   is their pid's and parent pid's. According to the standard, they
>   should have the same, but that's one thing we cannot achieve
>   in this implementation (until the CLONE_PID flag to clone() becomes
>   usable).
>
> When does the CLONE_PID flag to clone() becomes usable? 2.4.x? 2.5.x?

2.3 has the facility to share parent process ids.  (With a suitably
patched libpthread, this can shave a _lot_ of time for thread creation
and destruction.)

Does the pthread standard really require the pid sharing semantics?
That will break quite a bit of the kernel, and an awful lot of userspace.

Matthew.