RFR(s): 8149036: Add UL tracing for thread related events at os level

[Coleen Phillimore]

Hi Thomas,
I think the logging conversion looks really good.  The errno stuff is 
very ugly though.  Can you call strerrno_r - the thread safe version?  I 
didn't see discussion around this.
Thanks,
Coleen

On 2/22/16 11:54 AM, Thomas Stüfe wrote:
> Dear all,
>
> please take a look at this proposed addition to UL. This adds a number of
> trace points to thread creation. In detail:
>
> - it traces thread creation and thread creation errors, including pthread
> attributes (for Posix platforms)
> - it traces stack location and creation/removal of stack guard pages.
>
> This all was first AIX-only tracing, but I converted this to UL and made it
> available on all platforms.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8149036
> Webrev:
> http://cr.openjdk.java.net/~stuefe/webrevs/8149036-add-tracing-for-thread-events/webrev.00/webrev/
>
> Note also that I added a helper function, os::errno_name(), which is a very
> simple replacement for strerror() without its problems (thread safety,
> unwanted localizations...).
>
> What do you think?
>
> Kind Regards, Thomas