1 /*
2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 #include "precompiled.hpp"
25 #include "gc/z/zResurrection.hpp"
26 #include "runtime/atomic.hpp"
27 #include "runtime/safepoint.hpp"
28 #include "utilities/debug.hpp"
29
30 volatile bool ZResurrection::_blocked = false;
31
block()32 void ZResurrection::block() {
33 assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");
34 _blocked = true;
35 }
36
unblock()37 void ZResurrection::unblock() {
38 // No need for anything stronger than a relaxed store here.
39 // The preceeding handshake makes sure that all non-strong
40 // oops have already been healed at this point.
41 Atomic::store(&_blocked, false);
42 }
43