Win32 bits and bobs

[Tom Tromey]

>>>>> "Jon" == Jon Beniston <jb7216@bristol.ac.uk> writes:

Jon> Here's most of the code required for Win32 compatibility.

Thanks Jon.  I'll be checking this in soon.

I do have some concerns, though.  I think these should be addressed as
soon as possible.  I do think this port is important, though, so I'm
checking it in even though it isn't "perfect".

First, I'd like to understand the current Windows exception handling
code that is in there.  Can you explain it to me?  What does the
current code mean, and why do we have to do it that way?  I'm
particularly confused by (& concerned about) win32_get_restart_frame().

Second, I'm interested in seeing if we can find a way to make a nicer
abstract API to the signal handling code, so that the Windows and
POSIX ports don't need Windows-specific stuff in prims.cc.

Tom