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1 // Copyright 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 // Represents the browser side of the browser <--> renderer communication | 5 // Represents the browser side of the browser <--> renderer communication |
6 // channel. There will be one RenderProcessHost per renderer process. | 6 // channel. There will be one RenderProcessHost per renderer process. |
7 | 7 |
8 #include "content/browser/renderer_host/render_process_host_impl.h" | 8 #include "content/browser/renderer_host/render_process_host_impl.h" |
9 | 9 |
10 #include <algorithm> | 10 #include <algorithm> |
11 #include <limits> | 11 #include <limits> |
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2209 // The cbstext.dll loads as a global GetMessage hook in the browser process | 2209 // The cbstext.dll loads as a global GetMessage hook in the browser process |
2210 // and intercepts/unintercepts the kernel32 API SetPriorityClass in a | 2210 // and intercepts/unintercepts the kernel32 API SetPriorityClass in a |
2211 // background thread. If the UI thread invokes this API just when it is | 2211 // background thread. If the UI thread invokes this API just when it is |
2212 // intercepted the stack is messed up on return from the interceptor | 2212 // intercepted the stack is messed up on return from the interceptor |
2213 // which causes random crashes in the browser process. Our hack for now | 2213 // which causes random crashes in the browser process. Our hack for now |
2214 // is to not invoke the SetPriorityClass API if the dll is loaded. | 2214 // is to not invoke the SetPriorityClass API if the dll is loaded. |
2215 if (GetModuleHandle(L"cbstext.dll")) | 2215 if (GetModuleHandle(L"cbstext.dll")) |
2216 return; | 2216 return; |
2217 #endif // OS_WIN | 2217 #endif // OS_WIN |
2218 | 2218 |
2219 #if defined(OS_WIN) || defined(OS_MACOSX) | 2219 #if defined(OS_WIN) |
2220 // Same as below, but bound to an experiment (http://crbug.com/458594 on | 2220 // Same as below, but bound to an experiment (http://crbug.com/458594) |
2221 // Windows, http://crbug.com/398103 on the Mac). Enabled by default in the | 2221 // initially on Windows. Enabled by default in the asbence of field trials to |
2222 // absence of field trials to get coverage on the perf waterfall. | 2222 // get coverage on the perf waterfall. |
2223 base::FieldTrial* trial = | 2223 base::FieldTrial* trial = |
2224 base::FieldTrialList::Find("BackgroundRendererProcesses"); | 2224 base::FieldTrialList::Find("BackgroundRendererProcesses"); |
2225 if (!trial || !StartsWithASCII(trial->group_name(), "Disallow", true)) { | 2225 if (!trial || trial->group_name() != "Disallow") |
2226 child_process_launcher_->SetProcessBackgrounded(backgrounded); | 2226 child_process_launcher_->SetProcessBackgrounded(backgrounded); |
2227 } | |
2228 #else | 2227 #else |
2229 // Control the background state from the browser process, otherwise the task | 2228 // Control the background state from the browser process, otherwise the task |
2230 // telling the renderer to "unbackground" itself may be preempted by other | 2229 // telling the renderer to "unbackground" itself may be preempted by other |
2231 // tasks executing at lowered priority ahead of it or simply by not being | 2230 // tasks executing at lowered priority ahead of it or simply by not being |
2232 // swiftly scheduled by the OS per the low process priority | 2231 // swiftly scheduled by the OS per the low process priority |
2233 // (http://crbug.com/398103). | 2232 // (http://crbug.com/398103). |
2234 child_process_launcher_->SetProcessBackgrounded(backgrounded); | 2233 child_process_launcher_->SetProcessBackgrounded(backgrounded); |
2235 #endif // OS_WIN | 2234 #endif // OS_WIN |
2236 | 2235 |
2237 // Notify the child process of background state. | 2236 // Notify the child process of background state. |
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2459 if (worker_ref_count_ == 0) | 2458 if (worker_ref_count_ == 0) |
2460 Cleanup(); | 2459 Cleanup(); |
2461 } | 2460 } |
2462 | 2461 |
2463 void RenderProcessHostImpl::GetAudioOutputControllers( | 2462 void RenderProcessHostImpl::GetAudioOutputControllers( |
2464 const GetAudioOutputControllersCallback& callback) const { | 2463 const GetAudioOutputControllersCallback& callback) const { |
2465 audio_renderer_host()->GetOutputControllers(callback); | 2464 audio_renderer_host()->GetOutputControllers(callback); |
2466 } | 2465 } |
2467 | 2466 |
2468 } // namespace content | 2467 } // namespace content |
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