Caching of PID/TID after fork

[Florian Weimer]

* Robert Święcki:

> Thefore I'd like to ask for one of the following solutions:
>
> 1. Don't cache PID/TID
>
> 2. Provide some kind of symbol, which would force for TID/PID to be
> reloaded in glibc.

I think we need a different design.

For example, when you clone a process, you really want that all
cryptographic random number generators are reinitialized.  Making this
depend on getpid does not really work, so we need a more general
solution.

The other question I have is whether we talk about clone-as-fork
exclusively.  Introducing a new thread into the process on which
non-free-standing code can run using clone is a different matter
altogether.