7034570: java.lang.Runtime.exec(String[] cmd, String[] env) can not work properly if SystemRoot not inherited
Reviewed-by: dholmes, alanb

Reviewed-by: xdono

Reviewed-by: darcy, lancea, alanb, briangoetz, mduigou, mchung

6709457: (fc) lock/tryLock() throws IOException "Access is denied" when file opened for append [win]
Reviewed-by: chegar

Summary: use thread pool for reaper thread; move most I/O operations out of reaper thread
Reviewed-by: michaelm, hiroshi

Reviewed-by: darcy, weijun

Summary: clone array returned by List.toArray()
Reviewed-by: chegar, alanb

Reviewed-by: alanb, iris