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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 #include "chrome/browser/metrics/tracking_synchronizer.h" | 5 #include "chrome/browser/metrics/tracking_synchronizer.h" |
| 6 | 6 |
| 7 #include "base/bind.h" | 7 #include "base/bind.h" |
| 8 #include "base/json/json_reader.h" | 8 #include "base/json/json_reader.h" |
| 9 #include "base/json/json_writer.h" | 9 #include "base/json/json_writer.h" |
| 10 #include "base/logging.h" | 10 #include "base/logging.h" |
| 11 #include "base/metrics/histogram.h" | 11 #include "base/metrics/histogram.h" |
| 12 #include "base/threading/thread.h" | 12 #include "base/threading/thread.h" |
| 13 #include "base/tracked_objects.h" | 13 #include "base/tracked_objects.h" |
| 14 #include "chrome/browser/ui/webui/tracing_ui.h" | 14 #include "chrome/browser/ui/webui/tracing_ui.h" |
| 15 #include "chrome/common/chrome_constants.h" | 15 #include "chrome/common/chrome_constants.h" |
| 16 #include "chrome/common/render_messages.h" | 16 #include "chrome/common/render_messages.h" |
| 17 #include "content/browser/renderer_host/render_process_host.h" | |
| 18 #include "content/public/browser/browser_thread.h" | 17 #include "content/public/browser/browser_thread.h" |
| 18 #include "content/public/browser/render_process_host.h" |
| 19 | 19 |
| 20 using base::TimeTicks; | 20 using base::TimeTicks; |
| 21 using content::BrowserThread; | 21 using content::BrowserThread; |
| 22 | 22 |
| 23 namespace chrome_browser_metrics { | 23 namespace chrome_browser_metrics { |
| 24 | 24 |
| 25 // Negative numbers are never used as sequence numbers. We explicitly pick a | 25 // Negative numbers are never used as sequence numbers. We explicitly pick a |
| 26 // negative number that is "so negative" that even when we add one (as is done | 26 // negative number that is "so negative" that even when we add one (as is done |
| 27 // when we generated the next sequence number) that it will still be negative. | 27 // when we generated the next sequence number) that it will still be negative. |
| 28 // We have code that handles wrapping around on an overflow into negative | 28 // We have code that handles wrapping around on an overflow into negative |
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| 262 // Watch out for wrapping to a negative number. | 262 // Watch out for wrapping to a negative number. |
| 263 if (last_used_sequence_number_ < 0) | 263 if (last_used_sequence_number_ < 0) |
| 264 last_used_sequence_number_ = 1; | 264 last_used_sequence_number_ = 1; |
| 265 return last_used_sequence_number_; | 265 return last_used_sequence_number_; |
| 266 } | 266 } |
| 267 | 267 |
| 268 // static | 268 // static |
| 269 TrackingSynchronizer* TrackingSynchronizer::tracking_synchronizer_ = NULL; | 269 TrackingSynchronizer* TrackingSynchronizer::tracking_synchronizer_ = NULL; |
| 270 | 270 |
| 271 } // namespace chrome_browser_metrics | 271 } // namespace chrome_browser_metrics |
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