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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 "components/metrics/profiler/tracking_synchronizer.h" |
6 | 6 |
7 #include "base/bind.h" | 7 #include "base/bind.h" |
8 #include "base/metrics/histogram.h" | 8 #include "base/metrics/histogram.h" |
9 #include "base/threading/thread.h" | 9 #include "base/threading/thread.h" |
10 #include "base/tracked_objects.h" | 10 #include "base/tracked_objects.h" |
11 #include "chrome/browser/metrics/tracking_synchronizer_observer.h" | 11 #include "components/metrics/profiler/tracking_synchronizer_observer.h" |
12 #include "content/public/browser/browser_thread.h" | 12 #include "content/public/browser/browser_thread.h" |
13 #include "content/public/browser/profiler_controller.h" | 13 #include "content/public/browser/profiler_controller.h" |
14 #include "content/public/common/process_type.h" | 14 #include "content/public/common/process_type.h" |
15 | 15 |
16 using base::TimeTicks; | 16 using base::TimeTicks; |
17 using content::BrowserThread; | 17 using content::BrowserThread; |
18 | 18 |
19 namespace { | 19 namespace { |
20 | 20 |
21 // Negative numbers are never used as sequence numbers. We explicitly pick a | 21 // Negative numbers are never used as sequence numbers. We explicitly pick a |
22 // negative number that is "so negative" that even when we add one (as is done | 22 // negative number that is "so negative" that even when we add one (as is done |
23 // when we generated the next sequence number) that it will still be negative. | 23 // when we generated the next sequence number) that it will still be negative. |
24 // We have code that handles wrapping around on an overflow into negative | 24 // We have code that handles wrapping around on an overflow into negative |
25 // territory. | 25 // territory. |
26 const int kNeverUsableSequenceNumber = -2; | 26 const int kNeverUsableSequenceNumber = -2; |
27 | 27 |
28 // This singleton instance should be started during the single threaded | 28 // This singleton instance should be started during the single threaded |
29 // portion of main(). It initializes globals to provide support for all future | 29 // portion of main(). It initializes globals to provide support for all future |
30 // calls. This object is created on the UI thread, and it is destroyed after | 30 // calls. This object is created on the UI thread, and it is destroyed after |
31 // all the other threads have gone away. As a result, it is ok to call it | 31 // all the other threads have gone away. As a result, it is ok to call it |
32 // from the UI thread, or for about:profiler. | 32 // from the UI thread, or for about:profiler. |
33 static chrome_browser_metrics::TrackingSynchronizer* g_tracking_synchronizer = | 33 static metrics::TrackingSynchronizer* g_tracking_synchronizer = |
34 NULL; | 34 NULL; |
35 | 35 |
36 } // anonymous namespace | 36 } // anonymous namespace |
37 | 37 |
38 namespace chrome_browser_metrics { | 38 namespace metrics { |
39 | 39 |
40 // The "RequestContext" structure describes an individual request received | 40 // The "RequestContext" structure describes an individual request received |
41 // from the UI. All methods are accessible on UI thread. | 41 // from the UI. All methods are accessible on UI thread. |
42 class TrackingSynchronizer::RequestContext { | 42 class TrackingSynchronizer::RequestContext { |
43 public: | 43 public: |
44 // A map from sequence_number_ to the actual RequestContexts. | 44 // A map from sequence_number_ to the actual RequestContexts. |
45 typedef std::map<int, RequestContext*> RequestContextMap; | 45 typedef std::map<int, RequestContext*> RequestContextMap; |
46 | 46 |
47 RequestContext( | 47 RequestContext( |
48 const base::WeakPtr<TrackingSynchronizerObserver>& callback_object, | 48 const base::WeakPtr<TrackingSynchronizerObserver>& callback_object, |
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287 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); | 287 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); |
288 | 288 |
289 ++last_used_sequence_number_; | 289 ++last_used_sequence_number_; |
290 | 290 |
291 // Watch out for wrapping to a negative number. | 291 // Watch out for wrapping to a negative number. |
292 if (last_used_sequence_number_ < 0) | 292 if (last_used_sequence_number_ < 0) |
293 last_used_sequence_number_ = 1; | 293 last_used_sequence_number_ = 1; |
294 return last_used_sequence_number_; | 294 return last_used_sequence_number_; |
295 } | 295 } |
296 | 296 |
297 } // namespace chrome_browser_metrics | 297 } // namespace metrics |
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