src/hotspot/share/gc/z/zMarkTerminate.inline.hpp
author stefank
Mon, 25 Nov 2019 12:33:15 +0100
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parent 59250 a6deb69743d4
child 59290 97d13893ec3c
permissions -rw-r--r--
8234740: Harmonize parameter order in Atomic - cmpxchg Reviewed-by: rehn, dholmes
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/*
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 * Copyright (c) 2017, 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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#ifndef SHARE_GC_Z_ZMARKTERMINATE_INLINE_HPP
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#define SHARE_GC_Z_ZMARKTERMINATE_INLINE_HPP
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#include "runtime/atomic.hpp"
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#include "runtime/orderAccess.hpp"
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inline ZMarkTerminate::ZMarkTerminate() :
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    _nworkers(0),
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    _nworking_stage0(0),
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    _nworking_stage1(0) {}
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inline bool ZMarkTerminate::enter_stage(volatile uint* nworking_stage) {
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  return Atomic::sub(nworking_stage, 1u) == 0;
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}
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inline void ZMarkTerminate::exit_stage(volatile uint* nworking_stage) {
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  Atomic::add(nworking_stage, 1u);
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}
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inline bool ZMarkTerminate::try_exit_stage(volatile uint* nworking_stage) {
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  uint nworking = Atomic::load(nworking_stage);
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  for (;;) {
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    if (nworking == 0) {
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      return false;
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    }
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    const uint new_nworking = nworking + 1;
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    const uint prev_nworking = Atomic::cmpxchg(nworking_stage, nworking, new_nworking);
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    if (prev_nworking == nworking) {
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      // Success
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      return true;
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    }
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    // Retry
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    nworking = prev_nworking;
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  }
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}
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inline void ZMarkTerminate::reset(uint nworkers) {
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  _nworkers = _nworking_stage0 = _nworking_stage1 = nworkers;
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}
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inline bool ZMarkTerminate::enter_stage0() {
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  return enter_stage(&_nworking_stage0);
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}
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inline void ZMarkTerminate::exit_stage0() {
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  exit_stage(&_nworking_stage0);
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}
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inline bool ZMarkTerminate::try_exit_stage0() {
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  return try_exit_stage(&_nworking_stage0);
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}
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inline bool ZMarkTerminate::enter_stage1() {
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  return enter_stage(&_nworking_stage1);
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}
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inline bool ZMarkTerminate::try_exit_stage1() {
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  return try_exit_stage(&_nworking_stage1);
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}
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#endif // SHARE_GC_Z_ZMARKTERMINATE_INLINE_HPP