1 /*
 2  * Copyright (c) 2018, 2019, 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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23  */
24 
25 #ifndef SHARE_GC_PARALLEL_PSFILEBACKEDVIRTUALSPACE_HPP
26 #define SHARE_GC_PARALLEL_PSFILEBACKEDVIRTUALSPACE_HPP
27 
28 #include "gc/parallel/psVirtualspace.hpp"
29 
30 class PSFileBackedVirtualSpace : public PSVirtualSpace {
31 private:
32   const char* _file_path;
33   int _fd;
34   bool _mapping_succeeded;
35 public:
36   PSFileBackedVirtualSpace(ReservedSpace rs, size_t alignment, const char* file_path);
37   PSFileBackedVirtualSpace(ReservedSpace rs, const char* file_path);
38 
39   bool   initialize();
40   bool   expand_by(size_t bytes);
41   bool   shrink_by(size_t bytes);
42   size_t expand_into(PSVirtualSpace* space, size_t bytes);
43   void   release();
44 };
45 #endif // SHARE_GC_PARALLEL_PSFILEBACKEDVIRTUALSPACE_HPP