jdk

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/*
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 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "runtime/atomic.hpp"
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#include "suspendResume_posix.hpp"
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/* try to switch state from state "from" to state "to"
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 * returns the state set after the method is complete
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 */
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SuspendResume::State SuspendResume::switch_state(SuspendResume::State from,
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                                                 SuspendResume::State to)
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{
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  SuspendResume::State result = Atomic::cmpxchg(&_state, from, to);
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  if (result == from) {
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    // success
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    return to;
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  }
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  return result;
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}
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