hg: jdk/sandbox: 8021335: Missing synchronization when reading counters for live threads and peak thread count

[chris.hegarty at oracle.com]

Changeset: 99962c340e73
Author:    dlong
Date:      2018-10-25 18:41 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/99962c340e73

8021335: Missing synchronization when reading counters for live threads and peak thread count
Reviewed-by: dholmes, mchung

! src/hotspot/share/runtime/thread.cpp
! src/hotspot/share/services/threadService.cpp
! src/hotspot/share/services/threadService.hpp
! test/jdk/java/lang/management/ThreadMXBean/ResetPeakThreadCount.java