Mercurial > hg > truffle
annotate src/share/vm/memory/referencePolicy.hpp @ 832:e7d5557ad624
Merge
author | jmasa |
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date | Thu, 02 Jul 2009 16:28:15 -0700 |
parents | ad8c8ca4ab0f |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
470 | 2 * Copyright 2000-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // referencePolicy is used to determine when soft reference objects | |
26 // should be cleared. | |
27 | |
28 | |
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29 class ReferencePolicy : public CHeapObj { |
0 | 30 public: |
31 virtual bool should_clear_reference(oop p) { ShouldNotReachHere(); return true; } | |
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32 // Capture state (of-the-VM) information needed to evaluate the policy |
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33 virtual void setup() { /* do nothing */ } |
0 | 34 }; |
35 | |
36 class NeverClearPolicy : public ReferencePolicy { | |
37 public: | |
38 bool should_clear_reference(oop p) { return false; } | |
39 }; | |
40 | |
41 class AlwaysClearPolicy : public ReferencePolicy { | |
42 public: | |
43 bool should_clear_reference(oop p) { return true; } | |
44 }; | |
45 | |
46 class LRUCurrentHeapPolicy : public ReferencePolicy { | |
47 private: | |
48 jlong _max_interval; | |
49 | |
50 public: | |
51 LRUCurrentHeapPolicy(); | |
52 | |
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53 // Capture state (of-the-VM) information needed to evaluate the policy |
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6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
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54 void setup(); |
0 | 55 bool should_clear_reference(oop p); |
56 }; | |
57 | |
58 class LRUMaxHeapPolicy : public ReferencePolicy { | |
59 private: | |
60 jlong _max_interval; | |
61 | |
62 public: | |
63 LRUMaxHeapPolicy(); | |
64 | |
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65 // Capture state (of-the-VM) information needed to evaluate the policy |
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6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
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66 void setup(); |
0 | 67 bool should_clear_reference(oop p); |
68 }; |