1 /*
   2  * Copyright (c) 2017, 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 #ifndef SHARE_GC_Z_ZMARKTERMINATE_HPP
  25 #define SHARE_GC_Z_ZMARKTERMINATE_HPP
  26 
  27 #include "gc/z/zGlobals.hpp"
  28 #include "memory/allocation.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 
  31 class ZMarkTerminate {
  32 private:
  33   uint          _nworkers;
  34   volatile uint _nworking_stage0 ATTRIBUTE_ALIGNED(ZCacheLineSize);
  35   volatile uint _nworking_stage1;
  36 
  37   bool enter_stage(volatile uint* nworking_stage);
  38   void exit_stage(volatile uint* nworking_stage);
  39   bool try_exit_stage(volatile uint* nworking_stage);
  40 
  41 public:
  42   ZMarkTerminate();
  43 
  44   void reset(uint nworkers);
  45 
  46   bool enter_stage0();
  47   void exit_stage0();
  48   bool try_exit_stage0();
  49 
  50   bool enter_stage1();
  51   bool try_exit_stage1();
  52 };
  53 
  54 #endif // SHARE_GC_Z_ZMARKTERMINATE_HPP