Implement Trylock on Windows.  This uses TryEnterCriticalSection which is not available on Windows 95/98 etc. It may simply fail or may mean the code will not run at all.
Implement Trylock on Windows.  This uses TryEnterCriticalSection which is not available on Windows 95/98 etc. It may simply fail or may mean the code will not run at all.


git-svn-id: 98787b36aaefbae4b30fa755be920954cd25e1e4@393 ae7d391e-3f74-4a2b-a0db-a8776840fd2a

dcjm/polyml,mn200/polyml,polyml/polyml,mn200/polyml,dcjm/polyml,dcjm/polyml,mn200/polyml,mn200/polyml,polyml/polyml,dcjm/polyml,polyml/polyml,polyml/polyml