1 /*
2 * Copyright (c) 2001, 2014, 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
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SPARSEPRT_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SPARSEPRT_HPP
27
28 #include "gc_implementation/g1/g1CollectedHeap.hpp"
29 #include "gc_implementation/g1/heapRegion.hpp"
30 #include "memory/allocation.hpp"
31 #include "memory/cardTableModRefBS.hpp"
32 #include "runtime/mutex.hpp"
33 #include "utilities/globalDefinitions.hpp"
34
35 // Sparse remembered set for a heap region (the "owning" region). Maps
36 // indices of other regions to short sequences of cards in the other region
37 // that might contain pointers into the owner region.
38
39 // These tables only expand while they are accessed in parallel --
40 // deletions may be done in single-threaded code. This allows us to allow
41 // unsynchronized reads/iterations, as long as expansions caused by
42 // insertions only enqueue old versions for deletions, but do not delete
43 // old versions synchronously.
44
45 class SparsePRTEntry: public CHeapObj<mtGC> {
46 public:
47 enum SomePublicConstants {
48 NullEntry = -1,
49 UnrollFactor = 4
50 };
51 private:
314 };
315
316 // This allows each worker during a cleanup pause to create a
317 // thread-local list of sparse tables that have been expanded and need
318 // to be processed at the beginning of the next GC pause. This lists
319 // are concatenated into the single expanded list at the end of the
320 // cleanup pause.
321 class SparsePRTCleanupTask VALUE_OBJ_CLASS_SPEC {
322 private:
323 SparsePRT* _head;
324 SparsePRT* _tail;
325
326 public:
327 SparsePRTCleanupTask() : _head(NULL), _tail(NULL) { }
328
329 void add(SparsePRT* sprt);
330 SparsePRT* head() { return _head; }
331 SparsePRT* tail() { return _tail; }
332 };
333
334 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SPARSEPRT_HPP
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1 /*
2 * Copyright (c) 2001, 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
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_G1_SPARSEPRT_HPP
26 #define SHARE_VM_GC_G1_SPARSEPRT_HPP
27
28 #include "gc/g1/g1CollectedHeap.hpp"
29 #include "gc/g1/heapRegion.hpp"
30 #include "gc/shared/cardTableModRefBS.hpp"
31 #include "memory/allocation.hpp"
32 #include "runtime/mutex.hpp"
33 #include "utilities/globalDefinitions.hpp"
34
35 // Sparse remembered set for a heap region (the "owning" region). Maps
36 // indices of other regions to short sequences of cards in the other region
37 // that might contain pointers into the owner region.
38
39 // These tables only expand while they are accessed in parallel --
40 // deletions may be done in single-threaded code. This allows us to allow
41 // unsynchronized reads/iterations, as long as expansions caused by
42 // insertions only enqueue old versions for deletions, but do not delete
43 // old versions synchronously.
44
45 class SparsePRTEntry: public CHeapObj<mtGC> {
46 public:
47 enum SomePublicConstants {
48 NullEntry = -1,
49 UnrollFactor = 4
50 };
51 private:
314 };
315
316 // This allows each worker during a cleanup pause to create a
317 // thread-local list of sparse tables that have been expanded and need
318 // to be processed at the beginning of the next GC pause. This lists
319 // are concatenated into the single expanded list at the end of the
320 // cleanup pause.
321 class SparsePRTCleanupTask VALUE_OBJ_CLASS_SPEC {
322 private:
323 SparsePRT* _head;
324 SparsePRT* _tail;
325
326 public:
327 SparsePRTCleanupTask() : _head(NULL), _tail(NULL) { }
328
329 void add(SparsePRT* sprt);
330 SparsePRT* head() { return _head; }
331 SparsePRT* tail() { return _tail; }
332 };
333
334 #endif // SHARE_VM_GC_G1_SPARSEPRT_HPP
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