MFC req for 5.x/5.3

[David Xu]

Ken Smith wrote:

>Yup.  That's why I thought we would need to be a little bit careful
>with this, it's a bit more complicated than it first seems.  There
>is a chance for example that a piece that's not being MFC-ed added
>an extra #include and if the new code that's being MFC-ed relies on
>that it can be a bit tough to catch with the first attempt.  My
>asking for caution on this wasn't a reflection on Julian, I'd ask
>anyone to be this careful about this particular MFC because it doesn't
>look like it's a straight "MFC everything".  And doing an "MFC everything"
>for a library like this is risky at the RC2 stage, it's possible pieces
>of what gets swept in could have an impact (possibly negative) on the
>packages that use it.  It would be a bit of a gamble.
>
>Thanks for your work on this guys.  Greatly appreciated.
>
>  
>
Because the library in RELENG_5 can not pass my stress test:
http://people.freebsd.org/~davidxu/thread_stress/joinstress.c
I think it is a real world test case for web server like program,
without this patches, I don't think libpthread can be used under
heavily loaded environment.

David Xu