hg: jdk/sandbox: 8237756: Backout: JDK-8230594: Allow direct handshakes without VMThread intervention

[chris.hegarty at oracle.com]

Changeset: 36e49db57f6d
Author:    pchilanomate
Date:      2020-01-23 17:26 +0000
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/36e49db57f6d

8237756: Backout: JDK-8230594: Allow direct handshakes without VMThread intervention
Summary: Backout JDK-8230594
Reviewed-by: coleenp, dcubed

! src/hotspot/share/runtime/biasedLocking.cpp
! src/hotspot/share/runtime/handshake.cpp
! src/hotspot/share/runtime/handshake.hpp
! src/hotspot/share/runtime/mutexLocker.cpp
! src/hotspot/share/runtime/safepoint.cpp
! src/hotspot/share/runtime/safepointMechanism.inline.hpp
! src/hotspot/share/runtime/thread.cpp
! src/hotspot/share/runtime/thread.hpp
- test/hotspot/jtreg/runtime/handshake/HandshakeDirectTest.java