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Side by Side Diff: base/metrics/stats_table.h

Issue 5986012: Move thread local stuff from base to base/threading and consistently use the... (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 9 years, 11 months ago
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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 // 4 //
5 // A StatsTable is a table of statistics. It can be used across multiple 5 // A StatsTable is a table of statistics. It can be used across multiple
6 // processes and threads, maintaining cheap statistics counters without 6 // processes and threads, maintaining cheap statistics counters without
7 // locking. 7 // locking.
8 // 8 //
9 // The goal is to make it very cheap and easy for developers to add 9 // The goal is to make it very cheap and easy for developers to add
10 // counters to code, without having to build one-off utilities or mechanisms 10 // counters to code, without having to build one-off utilities or mechanisms
11 // to track the counters, and also to allow a single "view" to display 11 // to track the counters, and also to allow a single "view" to display
12 // the contents of all counters. 12 // the contents of all counters.
13 // 13 //
14 // To achieve this, StatsTable creates a shared memory segment to store 14 // To achieve this, StatsTable creates a shared memory segment to store
15 // the data for the counters. Upon creation, it has a specific size 15 // the data for the counters. Upon creation, it has a specific size
16 // which governs the maximum number of counters and concurrent 16 // which governs the maximum number of counters and concurrent
17 // threads/processes which can use it. 17 // threads/processes which can use it.
18 // 18 //
19 19
20 #ifndef BASE_METRICS_STATS_TABLE_H_ 20 #ifndef BASE_METRICS_STATS_TABLE_H_
21 #define BASE_METRICS_STATS_TABLE_H_ 21 #define BASE_METRICS_STATS_TABLE_H_
22 #pragma once 22 #pragma once
23 23
24 #include <string> 24 #include <string>
25 25
26 #include "base/basictypes.h" 26 #include "base/basictypes.h"
27 #include "base/hash_tables.h" 27 #include "base/hash_tables.h"
28 #include "base/lock.h" 28 #include "base/lock.h"
29 #include "base/thread_local_storage.h" 29 #include "base/threading/thread_local_storage.h"
30 30
31 namespace base { 31 namespace base {
32 32
33 class StatsTable { 33 class StatsTable {
34 public: 34 public:
35 // Create a new StatsTable. 35 // Create a new StatsTable.
36 // If a StatsTable already exists with the specified name, this StatsTable 36 // If a StatsTable already exists with the specified name, this StatsTable
37 // will use the same shared memory segment as the original. Otherwise, 37 // will use the same shared memory segment as the original. Otherwise,
38 // a new StatsTable is created and all counters are zeroed. 38 // a new StatsTable is created and all counters are zeroed.
39 // 39 //
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177 177
178 // The counters_lock_ protects the counters_ hash table. 178 // The counters_lock_ protects the counters_ hash table.
179 Lock counters_lock_; 179 Lock counters_lock_;
180 180
181 // The counters_ hash map is an in-memory hash of the counters. 181 // The counters_ hash map is an in-memory hash of the counters.
182 // It is used for quick lookup of counters, but is cannot be used 182 // It is used for quick lookup of counters, but is cannot be used
183 // as a substitute for what is in the shared memory. Even though 183 // as a substitute for what is in the shared memory. Even though
184 // we don't have a counter in our hash table, another process may 184 // we don't have a counter in our hash table, another process may
185 // have created it. 185 // have created it.
186 CountersMap counters_; 186 CountersMap counters_;
187 TLSSlot tls_index_; 187 ThreadLocalStorage::Slot tls_index_;
188 188
189 static StatsTable* global_table_; 189 static StatsTable* global_table_;
190 190
191 DISALLOW_COPY_AND_ASSIGN(StatsTable); 191 DISALLOW_COPY_AND_ASSIGN(StatsTable);
192 }; 192 };
193 193
194 } // namespace base 194 } // namespace base
195 195
196 #endif // BASE_METRICS_STATS_TABLE_H_ 196 #endif // BASE_METRICS_STATS_TABLE_H_
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