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

Issue 7461141: Rename BASE_API to BASE_EXPORT. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: '' Created 9 years, 4 months ago
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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2011 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/base_api.h" 26 #include "base/base_export.h"
27 #include "base/basictypes.h" 27 #include "base/basictypes.h"
28 #include "base/hash_tables.h" 28 #include "base/hash_tables.h"
29 #include "base/synchronization/lock.h" 29 #include "base/synchronization/lock.h"
30 #include "base/threading/thread_local_storage.h" 30 #include "base/threading/thread_local_storage.h"
31 31
32 namespace base { 32 namespace base {
33 33
34 class BASE_API StatsTable { 34 class BASE_EXPORT StatsTable {
35 public: 35 public:
36 // Create a new StatsTable. 36 // Create a new StatsTable.
37 // If a StatsTable already exists with the specified name, this StatsTable 37 // If a StatsTable already exists with the specified name, this StatsTable
38 // will use the same shared memory segment as the original. Otherwise, 38 // will use the same shared memory segment as the original. Otherwise,
39 // a new StatsTable is created and all counters are zeroed. 39 // a new StatsTable is created and all counters are zeroed.
40 // 40 //
41 // name is the name of the StatsTable to use. 41 // name is the name of the StatsTable to use.
42 // 42 //
43 // max_threads is the maximum number of threads the table will support. 43 // max_threads is the maximum number of threads the table will support.
44 // If the StatsTable already exists, this number is ignored. 44 // If the StatsTable already exists, this number is ignored.
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187 ThreadLocalStorage::Slot 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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