6649594: Intermittent IOExceptions during dynamic attach on linux and solaris

[Alan Bateman]

This is a long standing bug in the attach mechanism on Solaris and Linux 
that causes intermittent failures for some tests. The bug is that, on 
first attempt to attach, the client can observe the file to which the 
door descriptor is attached or the socket file before initialization is 
complete. The proposed fix removes the timing issue by renaming the file 
into place after initialization. Some minor clean-up while I was in the 
area. The webrev is here:
  http://cr.openjdk.java.net/~alanb/6649594/webrev/

Dan or Karen - one thing I wasn't sure about is whether to emit a 
warning when the attach listener can't start or should warnings be 
debug_only?

-Alan.