exceptions and threads

[Jeffrey A Law]

  In message < 199712092333.AAA02615@riva.nowhere >you write:
  > Hi all. I was wondering whether signalling a thread could be
  > converted safely into a C++ exception. My gut feeling is that
  > it cannot, but I'd like your compiler experts confirmation. 
Can you provide more details about what this really means.

Does this imply that exceptions can happen basically anywhere in
a program (as opposed to exceptions in C++ which happen at distinct
points (either a throw point or at function call points)

jeff