gclog improvements

[Tony Printezis]

Rainer Jung wrote:
> You could make it work platform independant by supporting formatting
> characters for pid (at least). There is already code for it in
> src/share/vm/utilities/ostream.cpp: make_log_name() replaces the first
> star in a string with the pid. It could be easily included in
> ostream_init_log() in the same file. Of course people already using a
> '*' in their log file names would experience incompatible behaviour, but
> that character is not very common in file names - even on Windows ;)
>
> More future proof (in the sense of extensible) would be to use %X for
> some letter X.
>   
Sounds like a nice little project. If you get it working and we like it, 
we will consider putting in into the openjdk. :-)

Tony

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