6960898: Regression due to src/share/classes/java/lang/ProcessBuilder.java changes Summary: Use Null{In,Out}putStream.INSTANCE as with Linux code Reviewed-by: ohair

6944584: Improvements to subprocess handling on Unix Summary: use thread pool for reaper thread; move most I/O operations out of reaper thread Reviewed-by: michaelm, hiroshi

6959197: When building with JAVAC_MAX_WARNINGS=true, the build fails in sun/nio/cs due to the use of -Werror Summary: Remove unneeded casts, add generic types and make better use of static data Reviewed-by: sherman