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. We use a dummy
  22   // thread here since the main thread already exists.
  23   BrowserThreadImpl(BrowserThread::ID identifier,
  24                     base::MessageLoop* message_loop);
  25   virtual ~BrowserThreadImpl();
  26
  27   static void ShutdownThreadPool();
  28
  29  protected:
  30   virtual void Init() OVERRIDE;
  31   virtual void Run(base::MessageLoop* message_loop) OVERRIDE;
  32   virtual void CleanUp() OVERRIDE;
  33
  34  private:
  35   // We implement all the functionality of the public BrowserThread
  36   // functions, but state is stored in the BrowserThreadImpl to keep
  37   // the API cleaner. Therefore make BrowserThread a friend class.
  38   friend class BrowserThread;
  39
  40   // The following are unique function names that makes it possible to tell
  41   // the thread id from the callstack alone in crash dumps.
  42   void UIThreadRun(base::MessageLoop* message_loop);
  43   void DBThreadRun(base::MessageLoop* message_loop);
  44   void WebKitThreadRun(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   static void FlushThreadPoolHelper();
  64
  65   // The identifier of this thread.  Only one thread can exist with a given
  66   // identifier at a given time.
  67   ID identifier_;
  68 };
  69
  70 }  // namespace content
  71
  72 #endif  // CONTENT_BROWSER_BROWSER_THREAD_IMPL_H_