Patch for Review: PR/9254 and other Win32 Threading Fixes

[Tom Tromey]

>>>>> "Adam" == Adam Megacz <gcj@lists.megacz.com> writes:

Adam> BTW, does it make sense for the platform-independent code to
Adam> implement mutex ownership?  Or are there platforms where the OS
Adam> can answer the query "which thread is holding mutex X"?

Originally I thought we could use POSIX mutexes and condition
variables, and the design was influenced by this.  It was also
influenced by quickthreads; in our hacked version I just made it work
in a way convenient for java.

These decisions are obsolete, but inertia carries us forward.

Tom