content/browser/browser_thread_impl.h

   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 #ifndef CONTENT_BROWSER_BROWSER_THREAD_IMPL_H_
   6 #define CONTENT_BROWSER_BROWSER_THREAD_IMPL_H_
   7
   8 #include "base/threading/thread.h"
   9 #include "content/common/content_export.h"
  10 #include "content/public/browser/browser_thread.h"
  11
  12 namespace content {
  13
  14 class CONTENT_EXPORT BrowserThreadImpl : public BrowserThread,
  15                                          public base::Thread {
  16  public:
  17   // Construct a BrowserThreadImpl with the supplied identifier.  It is an error
  18   // to construct a BrowserThreadImpl that already exists.
  19   explicit BrowserThreadImpl(BrowserThread::ID identifier);
  20
  21   // Special constructor for the main (UI) thread and unittests. If a
  22   // |message_loop| is provied, we use a dummy thread here since the main
  23   // thread already exists.
  24   BrowserThreadImpl(BrowserThread::ID identifier,
  25                     base::MessageLoop* message_loop);
  26   ~BrowserThreadImpl() override;
  27
  28   static void ShutdownThreadPool();
  29
  30  protected:
  31   void Init() override;
  32   void Run(base::MessageLoop* message_loop) override;
  33   void CleanUp() override;
  34
  35  private:
  36   // We implement all the functionality of the public BrowserThread
  37   // functions, but state is stored in the BrowserThreadImpl to keep
  38   // the API cleaner. Therefore make BrowserThread a friend class.
  39   friend class BrowserThread;
  40
  41   // The following are unique function names that makes it possible to tell
  42   // the thread id from the callstack alone in crash dumps.
  43   void UIThreadRun(base::MessageLoop* message_loop);
  44   void DBThreadRun(base::MessageLoop* message_loop);
  45   void FileThreadRun(base::MessageLoop* message_loop);
  46   void FileUserBlockingThreadRun(base::MessageLoop* message_loop);
  47   void ProcessLauncherThreadRun(base::MessageLoop* message_loop);
  48   void CacheThreadRun(base::MessageLoop* message_loop);
  49   void IOThreadRun(base::MessageLoop* message_loop);
  50
  51   static bool PostTaskHelper(
  52       BrowserThread::ID identifier,
  53       const tracked_objects::Location& from_here,
  54       const base::Closure& task,
  55       base::TimeDelta delay,
  56       bool nestable);
  57
  58   // Common initialization code for the constructors.
  59   void Initialize();
  60
  61   // For testing.
  62   friend class ContentTestSuiteBaseListener;
  63   friend class TestBrowserThreadBundle;
  64   static void FlushThreadPoolHelperForTesting();
  65
  66   // The identifier of this thread.  Only one thread can exist with a given
  67   // identifier at a given time.
  68   ID identifier_;
  69 };
  70
  71 }  // namespace content
  72
  73 #endif  // CONTENT_BROWSER_BROWSER_THREAD_IMPL_H_