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

Issue 6142009: Upating the app, ceee, chrome, ipc, media, and net directories to use the correct lock.h file. (Closed) Base URL: http://git.chromium.org/git/chromium.git@trunk
Patch Set: Unified patch updating all references to the new base/synchronization/lock.h Created 9 years, 11 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/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/synchronization/lock.h"
29 #include "base/threading/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.
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168 // On failure, returns 0. 168 // On failure, returns 0.
169 int AddCounter(const std::string& name); 169 int AddCounter(const std::string& name);
170 170
171 // Get the TLS data for the calling thread. Returns NULL if none is 171 // Get the TLS data for the calling thread. Returns NULL if none is
172 // initialized. 172 // initialized.
173 TLSData* GetTLSData() const; 173 TLSData* GetTLSData() const;
174 174
175 Private* impl_; 175 Private* impl_;
176 176
177 // The counters_lock_ protects the counters_ hash table. 177 // The counters_lock_ protects the counters_ hash table.
178 Lock counters_lock_; 178 base::Lock counters_lock_;
179 179
180 // The counters_ hash map is an in-memory hash of the counters. 180 // The counters_ hash map is an in-memory hash of the counters.
181 // It is used for quick lookup of counters, but is cannot be used 181 // It is used for quick lookup of counters, but is cannot be used
182 // as a substitute for what is in the shared memory. Even though 182 // as a substitute for what is in the shared memory. Even though
183 // we don't have a counter in our hash table, another process may 183 // we don't have a counter in our hash table, another process may
184 // have created it. 184 // have created it.
185 CountersMap counters_; 185 CountersMap counters_;
186 ThreadLocalStorage::Slot tls_index_; 186 ThreadLocalStorage::Slot tls_index_;
187 187
188 static StatsTable* global_table_; 188 static StatsTable* global_table_;
189 189
190 DISALLOW_COPY_AND_ASSIGN(StatsTable); 190 DISALLOW_COPY_AND_ASSIGN(StatsTable);
191 }; 191 };
192 192
193 } // namespace base 193 } // namespace base
194 194
195 #endif // BASE_METRICS_STATS_TABLE_H_ 195 #endif // BASE_METRICS_STATS_TABLE_H_
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