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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/histogram_synchronizer.h" | 5 #include "chrome/browser/metrics/histogram_synchronizer.h" |
| 6 | 6 |
| 7 #include "base/logging.h" | 7 #include "base/logging.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 "chrome/common/chrome_constants.h" | 10 #include "chrome/common/chrome_constants.h" |
| 11 #include "chrome/common/render_messages.h" | 11 #include "chrome/common/render_messages.h" |
| 12 #include "content/browser/renderer_host/render_process_host.h" | |
| 13 #include "content/public/browser/browser_thread.h" | 12 #include "content/public/browser/browser_thread.h" |
| 13 #include "content/public/browser/render_process_host.h" |
| 14 | 14 |
| 15 using base::Time; | 15 using base::Time; |
| 16 using base::TimeDelta; | 16 using base::TimeDelta; |
| 17 using base::TimeTicks; | 17 using base::TimeTicks; |
| 18 using content::BrowserThread; | 18 using content::BrowserThread; |
| 19 | 19 |
| 20 // Negative numbers are never used as sequence numbers. We explicitly pick a | 20 // Negative numbers are never used as sequence numbers. We explicitly pick a |
| 21 // negative number that is "so negative" that even when we add one (as is done | 21 // negative number that is "so negative" that even when we add one (as is done |
| 22 // when we generated the next sequence number) that it will still be negative. | 22 // when we generated the next sequence number) that it will still be negative. |
| 23 // We have code that handles wrapping around on an overflow into negative | 23 // We have code that handles wrapping around on an overflow into negative |
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| 127 current_synchronizer->DecrementPendingRenderers(sequence_number); | 127 current_synchronizer->DecrementPendingRenderers(sequence_number); |
| 128 } | 128 } |
| 129 | 129 |
| 130 int HistogramSynchronizer::NotifyAllRenderers( | 130 int HistogramSynchronizer::NotifyAllRenderers( |
| 131 RendererHistogramRequester requester) { | 131 RendererHistogramRequester requester) { |
| 132 // To iterate over RenderProcessHosts, or to send messages to the hosts, we | 132 // To iterate over RenderProcessHosts, or to send messages to the hosts, we |
| 133 // need to be on the UI thread. | 133 // need to be on the UI thread. |
| 134 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); | 134 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); |
| 135 | 135 |
| 136 int notification_count = 0; | 136 int notification_count = 0; |
| 137 for (RenderProcessHost::iterator it(RenderProcessHost::AllHostsIterator()); | 137 for (content::RenderProcessHost::iterator it( |
| 138 content::RenderProcessHost::AllHostsIterator()); |
| 138 !it.IsAtEnd(); it.Advance()) | 139 !it.IsAtEnd(); it.Advance()) |
| 139 ++notification_count; | 140 ++notification_count; |
| 140 | 141 |
| 141 int sequence_number = GetNextAvailableSequenceNumber(requester, | 142 int sequence_number = GetNextAvailableSequenceNumber(requester, |
| 142 notification_count); | 143 notification_count); |
| 143 for (RenderProcessHost::iterator it(RenderProcessHost::AllHostsIterator()); | 144 for (content::RenderProcessHost::iterator it( |
| 145 content::RenderProcessHost::AllHostsIterator()); |
| 144 !it.IsAtEnd(); it.Advance()) { | 146 !it.IsAtEnd(); it.Advance()) { |
| 145 if (!it.GetCurrentValue()->Send( | 147 if (!it.GetCurrentValue()->Send( |
| 146 new ChromeViewMsg_GetRendererHistograms(sequence_number))) | 148 new ChromeViewMsg_GetRendererHistograms(sequence_number))) |
| 147 DecrementPendingRenderers(sequence_number); | 149 DecrementPendingRenderers(sequence_number); |
| 148 } | 150 } |
| 149 | 151 |
| 150 return sequence_number; | 152 return sequence_number; |
| 151 } | 153 } |
| 152 | 154 |
| 153 void HistogramSynchronizer::DecrementPendingRenderers(int sequence_number) { | 155 void HistogramSynchronizer::DecrementPendingRenderers(int sequence_number) { |
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| 250 async_renderers_pending_ = renderer_count; | 252 async_renderers_pending_ = renderer_count; |
| 251 } else if (requester == SYNCHRONOUS_HISTOGRAMS) { | 253 } else if (requester == SYNCHRONOUS_HISTOGRAMS) { |
| 252 synchronous_sequence_number_ = last_used_sequence_number_; | 254 synchronous_sequence_number_ = last_used_sequence_number_; |
| 253 synchronous_renderers_pending_ = renderer_count; | 255 synchronous_renderers_pending_ = renderer_count; |
| 254 } | 256 } |
| 255 return last_used_sequence_number_; | 257 return last_used_sequence_number_; |
| 256 } | 258 } |
| 257 | 259 |
| 258 // static | 260 // static |
| 259 HistogramSynchronizer* HistogramSynchronizer::histogram_synchronizer_ = NULL; | 261 HistogramSynchronizer* HistogramSynchronizer::histogram_synchronizer_ = NULL; |
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