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
  15     : public BrowserThread, 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. We use a dummy
  22   // thread here since the main thread already exists.
  23   BrowserThreadImpl(BrowserThread::ID identifier, MessageLoop* message_loop);
  24   virtual ~BrowserThreadImpl();
  25
  26   static void ShutdownThreadPool();
  27
  28  protected:
  29   virtual void Init() OVERRIDE;
  30   virtual void Run(MessageLoop* message_loop) OVERRIDE;
  31   virtual void CleanUp() OVERRIDE;
  32
  33  private:
  34   // We implement all the functionality of the public BrowserThread
  35   // functions, but state is stored in the BrowserThreadImpl to keep
  36   // the API cleaner. Therefore make BrowserThread a friend class.
  37   friend class BrowserThread;
  38
  39   // The following are unique function names that makes it possible to tell
  40   // the thread id from the callstack alone in crash dumps.
  41   void UIThreadRun(MessageLoop* message_loop);
  42   void DBThreadRun(MessageLoop* message_loop);
  43   void WebKitThreadRun(MessageLoop* message_loop);
  44   void FileThreadRun(MessageLoop* message_loop);
  45   void FileUserBlockingThreadRun(MessageLoop* message_loop);
  46   void ProcessLauncherThreadRun(MessageLoop* message_loop);
  47   void CacheThreadRun(MessageLoop* message_loop);
  48   void IOThreadRun(MessageLoop* message_loop);
  49
  50   static bool PostTaskHelper(
  51       BrowserThread::ID identifier,
  52       const tracked_objects::Location& from_here,
  53       const base::Closure& task,
  54       base::TimeDelta delay,
  55       bool nestable);
  56
  57   // Common initialization code for the constructors.
  58   void Initialize();
  59
  60   // The identifier of this thread.  Only one thread can exist with a given
  61   // identifier at a given time.
  62   ID identifier_;
  63 };
  64
  65 }  // namespace content
  66
  67 #endif  // CONTENT_BROWSER_BROWSER_THREAD_IMPL_H_