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annotate src/share/vm/memory/freeList.hpp @ 20261:27188ae8bbbb
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Reviewed-by: coleenp, pliden
author | stefank |
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date | Thu, 27 Feb 2014 10:34:55 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
6026 | 25 #ifndef SHARE_VM_MEMORY_FREELIST_HPP |
26 #define SHARE_VM_MEMORY_FREELIST_HPP | |
1972 | 27 |
28 #include "gc_implementation/shared/allocationStats.hpp" | |
29 | |
0 | 30 class CompactibleFreeListSpace; |
31 | |
6026 | 32 // A class for maintaining a free list of Chunk's. The FreeList |
0 | 33 // maintains a the structure of the list (head, tail, etc.) plus |
34 // statistics for allocations from the list. The links between items | |
35 // are not part of FreeList. The statistics are | |
6026 | 36 // used to make decisions about coalescing Chunk's when they |
0 | 37 // are swept during collection. |
38 // | |
39 // See the corresponding .cpp file for a description of the specifics | |
40 // for that implementation. | |
41 | |
42 class Mutex; | |
43 | |
6885 | 44 template <class Chunk_t> |
0 | 45 class FreeList VALUE_OBJ_CLASS_SPEC { |
46 friend class CompactibleFreeListSpace; | |
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47 friend class VMStructs; |
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48 |
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49 private: |
6885 | 50 Chunk_t* _head; // Head of list of free chunks |
51 Chunk_t* _tail; // Tail of list of free chunks | |
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52 size_t _size; // Size in Heap words of each chunk |
0 | 53 ssize_t _count; // Number of entries in list |
54 | |
6885 | 55 protected: |
0 | 56 |
57 #ifdef ASSERT | |
58 Mutex* _protecting_lock; | |
59 #endif | |
60 | |
61 // Asserts false if the protecting lock (if any) is not held. | |
62 void assert_proper_lock_protection_work() const PRODUCT_RETURN; | |
63 void assert_proper_lock_protection() const { | |
64 #ifdef ASSERT | |
65 if (_protecting_lock != NULL) | |
66 assert_proper_lock_protection_work(); | |
67 #endif | |
68 } | |
69 | |
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70 void increment_count() { |
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71 _count++; |
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72 } |
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73 |
0 | 74 void decrement_count() { |
75 _count--; | |
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76 assert(_count >= 0, "Count should not be negative"); |
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77 } |
0 | 78 |
79 public: | |
80 // Constructor | |
81 // Construct a list without any entries. | |
82 FreeList(); | |
83 | |
6885 | 84 // Do initialization |
85 void initialize(); | |
86 | |
87 // Reset the head, tail, and count of a free list. | |
88 void reset(); | |
0 | 89 |
90 // Declare the current free list to be protected by the given lock. | |
91 #ifdef ASSERT | |
6885 | 92 Mutex* protecting_lock() const { return _protecting_lock; } |
93 void set_protecting_lock(Mutex* v) { | |
94 _protecting_lock = v; | |
0 | 95 } |
96 #endif | |
97 | |
98 // Accessors. | |
6885 | 99 Chunk_t* head() const { |
0 | 100 assert_proper_lock_protection(); |
101 return _head; | |
102 } | |
6885 | 103 void set_head(Chunk_t* v) { |
0 | 104 assert_proper_lock_protection(); |
105 _head = v; | |
106 assert(!_head || _head->size() == _size, "bad chunk size"); | |
107 } | |
108 // Set the head of the list and set the prev field of non-null | |
109 // values to NULL. | |
6885 | 110 void link_head(Chunk_t* v); |
0 | 111 |
6885 | 112 Chunk_t* tail() const { |
0 | 113 assert_proper_lock_protection(); |
114 return _tail; | |
115 } | |
6885 | 116 void set_tail(Chunk_t* v) { |
0 | 117 assert_proper_lock_protection(); |
118 _tail = v; | |
119 assert(!_tail || _tail->size() == _size, "bad chunk size"); | |
120 } | |
121 // Set the tail of the list and set the next field of non-null | |
122 // values to NULL. | |
6885 | 123 void link_tail(Chunk_t* v) { |
0 | 124 assert_proper_lock_protection(); |
125 set_tail(v); | |
126 if (v != NULL) { | |
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127 v->clear_next(); |
0 | 128 } |
129 } | |
130 | |
131 // No locking checks in read-accessors: lock-free reads (only) are benign. | |
132 // Readers are expected to have the lock if they are doing work that | |
133 // requires atomicity guarantees in sections of code. | |
134 size_t size() const { | |
135 return _size; | |
136 } | |
137 void set_size(size_t v) { | |
138 assert_proper_lock_protection(); | |
139 _size = v; | |
140 } | |
6885 | 141 ssize_t count() const { return _count; } |
142 void set_count(ssize_t v) { _count = v;} | |
0 | 143 |
6885 | 144 size_t get_better_size() { return size(); } |
0 | 145 |
6885 | 146 size_t returned_bytes() const { ShouldNotReachHere(); return 0; } |
147 void set_returned_bytes(size_t v) {} | |
148 void increment_returned_bytes_by(size_t v) {} | |
0 | 149 |
150 // Unlink head of list and return it. Returns NULL if | |
151 // the list is empty. | |
6885 | 152 Chunk_t* get_chunk_at_head(); |
0 | 153 |
154 // Remove the first "n" or "count", whichever is smaller, chunks from the | |
155 // list, setting "fl", which is required to be empty, to point to them. | |
6885 | 156 void getFirstNChunksFromList(size_t n, FreeList<Chunk_t>* fl); |
0 | 157 |
158 // Unlink this chunk from it's free list | |
6885 | 159 void remove_chunk(Chunk_t* fc); |
0 | 160 |
161 // Add this chunk to this free list. | |
6885 | 162 void return_chunk_at_head(Chunk_t* fc); |
163 void return_chunk_at_tail(Chunk_t* fc); | |
0 | 164 |
165 // Similar to returnChunk* but also records some diagnostic | |
166 // information. | |
6885 | 167 void return_chunk_at_head(Chunk_t* fc, bool record_return); |
168 void return_chunk_at_tail(Chunk_t* fc, bool record_return); | |
0 | 169 |
170 // Prepend "fl" (whose size is required to be the same as that of "this") | |
171 // to the front of "this" list. | |
6885 | 172 void prepend(FreeList<Chunk_t>* fl); |
0 | 173 |
174 // Verify that the chunk is in the list. | |
175 // found. Return NULL if "fc" is not found. | |
6885 | 176 bool verify_chunk_in_free_list(Chunk_t* fc) const; |
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177 |
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178 // Printing support |
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179 static void print_labels_on(outputStream* st, const char* c); |
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180 void print_on(outputStream* st, const char* c = NULL) const; |
0 | 181 }; |
1972 | 182 |
6026 | 183 #endif // SHARE_VM_MEMORY_FREELIST_HPP |