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
25 #ifndef SHARE_VM_GC_CMS_VMCMSOPERATIONS_HPP
26 #define SHARE_VM_GC_CMS_VMCMSOPERATIONS_HPP
27
28 #include "gc/cms/concurrentMarkSweepGeneration.hpp"
29 #include "gc/shared/gcCause.hpp"
30 #include "gc/shared/gcId.hpp"
31 #include "gc/shared/referencePendingListLocker.hpp"
32 #include "gc/shared/vmGCOperations.hpp"
33 #include "runtime/vm_operations.hpp"
34
35 // The VM_CMS_Operation is slightly different from
36 // a VM_GC_Operation -- and would not have subclassed easily
37 // to VM_GC_Operation without several changes to VM_GC_Operation.
38 // To minimize the changes, we have replicated some of the VM_GC_Operation
39 // functionality here. We will consolidate that back by doing subclassing
40 // as appropriate in Dolphin.
41 //
42 // VM_Operation
43 // VM_CMS_Operation
44 // - implements the common portion of work done in support
45 // of CMS' stop-world phases (initial mark and remark).
46 //
47 // VM_CMS_Initial_Mark
48 // VM_CMS_Final_Mark
49 //
50
51 // Forward decl.
52 class CMSCollector;
53
54 class VM_CMS_Operation: public VM_Operation {
55 private:
56 ReferencePendingListLocker _pending_list_locker;
57
58 protected:
59 CMSCollector* _collector; // associated collector
60 bool _prologue_succeeded; // whether doit_prologue succeeded
61 uint _gc_id;
62
63 bool lost_race() const;
64
65 // java.lang.ref.Reference support
66 void acquire_pending_list_lock();
67 void release_and_notify_pending_list_lock();
68
69 public:
70 VM_CMS_Operation(CMSCollector* collector):
71 _collector(collector),
72 _prologue_succeeded(false),
73 _gc_id(GCId::current()) {}
74 ~VM_CMS_Operation() {}
75
76 // The legal collector state for executing this CMS op.
77 virtual const CMSCollector::CollectorState legal_state() const = 0;
78
79 // Whether the pending list lock needs to be held
80 virtual const bool needs_pending_list_lock() const = 0;
81
82 // Execute operations in the context of the caller,
83 // prior to execution of the vm operation itself.
84 virtual bool doit_prologue();
85 // Execute operations in the context of the caller,
86 // following completion of the vm operation.
87 virtual void doit_epilogue();
|
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
25 #ifndef SHARE_VM_GC_CMS_VMCMSOPERATIONS_HPP
26 #define SHARE_VM_GC_CMS_VMCMSOPERATIONS_HPP
27
28 #include "gc/cms/concurrentMarkSweepGeneration.hpp"
29 #include "gc/shared/gcCause.hpp"
30 #include "gc/shared/gcId.hpp"
31 #include "gc/shared/vmGCOperations.hpp"
32 #include "runtime/vm_operations.hpp"
33
34 // The VM_CMS_Operation is slightly different from
35 // a VM_GC_Operation -- and would not have subclassed easily
36 // to VM_GC_Operation without several changes to VM_GC_Operation.
37 // To minimize the changes, we have replicated some of the VM_GC_Operation
38 // functionality here. We will consolidate that back by doing subclassing
39 // as appropriate in Dolphin.
40 //
41 // VM_Operation
42 // VM_CMS_Operation
43 // - implements the common portion of work done in support
44 // of CMS' stop-world phases (initial mark and remark).
45 //
46 // VM_CMS_Initial_Mark
47 // VM_CMS_Final_Mark
48 //
49
50 // Forward decl.
51 class CMSCollector;
52
53 class VM_CMS_Operation: public VM_Operation {
54 protected:
55 CMSCollector* _collector; // associated collector
56 bool _prologue_succeeded; // whether doit_prologue succeeded
57 uint _gc_id;
58
59 bool lost_race() const;
60
61 public:
62 VM_CMS_Operation(CMSCollector* collector):
63 _collector(collector),
64 _prologue_succeeded(false),
65 _gc_id(GCId::current()) {}
66 ~VM_CMS_Operation() {}
67
68 // The legal collector state for executing this CMS op.
69 virtual const CMSCollector::CollectorState legal_state() const = 0;
70
71 // Whether the pending list lock needs to be held
72 virtual const bool needs_pending_list_lock() const = 0;
73
74 // Execute operations in the context of the caller,
75 // prior to execution of the vm operation itself.
76 virtual bool doit_prologue();
77 // Execute operations in the context of the caller,
78 // following completion of the vm operation.
79 virtual void doit_epilogue();
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