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comparison src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children bb843ebc7c55
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1 /*
2 * Copyright 2005-2006 Sun Microsystems, Inc. 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 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 // The VM_CMS_Operation is slightly different from
26 // a VM_GC_Operation -- and would not have subclassed easily
27 // to VM_GC_Operation without several changes to VM_GC_Operation.
28 // To minimize the changes, we have replicated some of the VM_GC_Operation
29 // functionality here. We will consolidate that back by doing subclassing
30 // as appropriate in Dolphin.
31 //
32 // VM_Operation
33 // VM_CMS_Operation
34 // - implements the common portion of work done in support
35 // of CMS' stop-world phases (initial mark and remark).
36 //
37 // VM_CMS_Initial_Mark
38 // VM_CMS_Final_Mark
39 //
40
41 // Forward decl.
42 class CMSCollector;
43
44 class VM_CMS_Operation: public VM_Operation {
45 protected:
46 CMSCollector* _collector; // associated collector
47 bool _prologue_succeeded; // whether doit_prologue succeeded
48
49 bool lost_race() const;
50
51 // java.lang.ref.Reference support
52 void acquire_pending_list_lock();
53 void release_and_notify_pending_list_lock();
54
55 public:
56 VM_CMS_Operation(CMSCollector* collector):
57 _collector(collector),
58 _prologue_succeeded(false) {}
59 ~VM_CMS_Operation() {}
60
61 // The legal collector state for executing this CMS op.
62 virtual const CMSCollector::CollectorState legal_state() const = 0;
63
64 // Whether the pending list lock needs to be held
65 virtual const bool needs_pll() const = 0;
66
67 // Execute operations in the context of the caller,
68 // prior to execution of the vm operation itself.
69 virtual bool doit_prologue();
70 // Execute operations in the context of the caller,
71 // following completion of the vm operation.
72 virtual void doit_epilogue();
73
74 virtual bool evaluate_at_safepoint() const { return true; }
75 virtual bool is_cheap_allocated() const { return false; }
76 virtual bool allow_nested_vm_operations() const { return false; }
77 bool prologue_succeeded() const { return _prologue_succeeded; }
78
79 void verify_before_gc();
80 void verify_after_gc();
81 };
82
83
84 // VM_CMS_Operation for the initial marking phase of CMS.
85 class VM_CMS_Initial_Mark: public VM_CMS_Operation {
86 public:
87 VM_CMS_Initial_Mark(CMSCollector* _collector) :
88 VM_CMS_Operation(_collector) {}
89
90 virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; }
91 virtual void doit();
92
93 virtual const CMSCollector::CollectorState legal_state() const {
94 return CMSCollector::InitialMarking;
95 }
96
97 virtual const bool needs_pll() const {
98 return false;
99 }
100 };
101
102 // VM_CMS_Operation for the final remark phase of CMS.
103 class VM_CMS_Final_Remark: public VM_CMS_Operation {
104 public:
105 VM_CMS_Final_Remark(CMSCollector* _collector) :
106 VM_CMS_Operation(_collector) {}
107 virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; }
108 virtual void doit();
109
110 virtual const CMSCollector::CollectorState legal_state() const {
111 return CMSCollector::FinalMarking;
112 }
113
114 virtual const bool needs_pll() const {
115 return true;
116 }
117 };
118
119
120 // VM operation to invoke a concurrent collection of the heap as a
121 // GenCollectedHeap heap.
122 class VM_GenCollectFullConcurrent: public VM_GC_Operation {
123 public:
124 VM_GenCollectFullConcurrent(unsigned int gc_count_before,
125 unsigned int full_gc_count_before,
126 GCCause::Cause gc_cause)
127 : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */) {
128 _gc_cause = gc_cause;
129 assert(FullGCCount_lock != NULL && UseConcMarkSweepGC &&
130 ExplicitGCInvokesConcurrent, "Otherwise shouldn't be here");
131 assert(UseAsyncConcMarkSweepGC, "Else will hang caller");
132 }
133 ~VM_GenCollectFullConcurrent() {}
134 virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; }
135 virtual void doit();
136 virtual void doit_epilogue();
137 virtual bool is_cheap_allocated() const { return false; }
138 virtual bool evaluate_at_safepoint() const;
139 };