1 /*
   2  * Copyright (c) 2015, 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
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  24 
  25 #ifndef SHARE_VM_MEMORY_STRONGROOTSSCOPE_HPP
  26 #define SHARE_VM_MEMORY_STRONGROOTSSCOPE_HPP
  27 
  28 #include "memory/iterator.hpp"
  29 
  30 // Some collectors will perform "process_strong_roots" in parallel.
  31 // Such a call will involve claiming some fine-grained tasks, such as
  32 // scanning of threads and code blobs.
  33 // Claiming of these tasks requires that sequential code calls
  34 // initialization methods to set the claiming code in the right
  35 // state for parallel task claiming.
  36 // StrongRootsScope is a way to capture such setup code to make
  37 // sure that it is executed in the correct way.
  38 class StrongRootsScope : public MarkingCodeBlobClosure::MarkScope {
  39  public:
  40   StrongRootsScope(bool activate = true);
  41   ~StrongRootsScope();
  42 };
  43 
  44 #endif // SHARE_VM_MEMORY_STRONGROOTSSCOPE_HPP