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      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
      3 // found in the LICENSE file.
      4 
      5 #include "content/browser/browser_process_sub_thread.h"
      6 
      7 #include "base/debug/leak_tracker.h"
      8 #include "base/threading/thread_restrictions.h"
      9 #include "build/build_config.h"
     10 #include "content/browser/browser_child_process_host_impl.h"
     11 #include "content/browser/notification_service_impl.h"
     12 #include "net/url_request/url_fetcher.h"
     13 #include "net/url_request/url_request.h"
     14 
     15 #if defined(OS_WIN)
     16 #include "base/win/scoped_com_initializer.h"
     17 #endif
     18 
     19 namespace content {
     20 
     21 BrowserProcessSubThread::BrowserProcessSubThread(BrowserThread::ID identifier)
     22     : BrowserThreadImpl(identifier) {
     23 }
     24 
     25 BrowserProcessSubThread::~BrowserProcessSubThread() {
     26   Stop();
     27 }
     28 
     29 void BrowserProcessSubThread::Init() {
     30 #if defined(OS_WIN)
     31   com_initializer_.reset(new base::win::ScopedCOMInitializer());
     32 #endif
     33 
     34   notification_service_.reset(new NotificationServiceImpl());
     35 
     36   BrowserThreadImpl::Init();
     37 
     38   if (BrowserThread::CurrentlyOn(BrowserThread::IO)) {
     39     // Though this thread is called the "IO" thread, it actually just routes
     40     // messages around; it shouldn't be allowed to perform any blocking disk
     41     // I/O.
     42     base::ThreadRestrictions::SetIOAllowed(false);
     43     base::ThreadRestrictions::DisallowWaiting();
     44   }
     45 }
     46 
     47 void BrowserProcessSubThread::CleanUp() {
     48   if (BrowserThread::CurrentlyOn(BrowserThread::IO))
     49     IOThreadPreCleanUp();
     50 
     51   BrowserThreadImpl::CleanUp();
     52 
     53   notification_service_.reset();
     54 
     55 #if defined(OS_WIN)
     56   com_initializer_.reset();
     57 #endif
     58 }
     59 
     60 void BrowserProcessSubThread::IOThreadPreCleanUp() {
     61   // Kill all things that might be holding onto
     62   // net::URLRequest/net::URLRequestContexts.
     63 
     64   // Destroy all URLRequests started by URLFetchers.
     65   net::URLFetcher::CancelAll();
     66 
     67 #if !defined(OS_IOS)
     68   // If any child processes are still running, terminate them and
     69   // and delete the BrowserChildProcessHost instances to release whatever
     70   // IO thread only resources they are referencing.
     71   BrowserChildProcessHostImpl::TerminateAll();
     72 #endif  // !defined(OS_IOS)
     73 }
     74 
     75 }  // namespace content
     76