8072439: fix for 8047720 may need more work Summary: Cleanup PeriodTask_lock usage. Also reviewed by varming@gmail.com. Reviewed-by: dholmes, dcubed, mgronlun, coleenp Contributed-by: varming@gmail.com, daniel.daugherty@oracle.com

^build/
^dist/
^webrev
^testoutput/
/nbproject/private/
^make/netbeans/.*/build/
^make/netbeans/.*/dist/
^.hgtip
.DS_Store