/*
* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.max.vm.runtime;
import static com.sun.max.vm.thread.VmThreadLocal.*;
import com.sun.max.unsafe.*;
import com.sun.max.vm.thread.*;
/**
* A {@link VmOperation} that forces all Java threads to a safepoint, and marks them
* for suspend. When they continue from the safepoint, the {@link VmThreadLocal#SUSPEND} flag
* will be checked in the native code epilogue and they will actually suspend.
*/
public class SuspendVmOperation extends VmOperation {
public SuspendVmOperation(VmThread singleThread) {
super("SuspendThreads", singleThread, Mode.Safepoint);
}
@Override
protected void doThread(VmThread vmThread, Pointer ip, Pointer sp, Pointer fp) {
//HACK ALERT should be done elsewhere
vmThread.suspendMonitor.init();
// There is no race condition associated with this flag since
// it cannot be read until all the threads have been thawed.
SUSPEND.store(vmThread.tla(), Address.fromInt(1));
}
}