At browser exit, wait for pending print jobs before starting shutdown. This is to avoid a nested me…

chrome/browser/printing/print_job.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PRINTING_PRINT_JOB_H_
 #define CHROME_BROWSER_PRINTING_PRINT_JOB_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/printing/print_job_worker_owner.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Thread;
 
 namespace printing {
 
 // See definition below.
@@ skipping 80 matching lines @@
   void OnNotifyPrintJobEvent(const JobEventDetails& event_details);
 
   // Releases the worker thread by calling Stop(), then broadcasts a JOB_DONE
   // notification.
   void OnDocumentDone();
 
   // Terminates the worker thread in a very controlled way, to work around any
   // eventual deadlock.
   void ControlledWorkerShutdown();
 
+  // Called at shutdown when running a nested message loop.
+  void Quit();
+
   content::NotificationRegistrar registrar_;
 
   // Main message loop reference. Used to send notifications in the right
   // thread.
   MessageLoop* const ui_message_loop_;
 
   // Source that generates the PrintedPage's (i.e. a WebContents). It will be
   // set back to NULL if the source is deleted before this object.
   PrintedPagesSource* source_;
 
   // All the UI is done in a worker thread because many Win32 print functions
   // are blocking and enters a message loop without your consent. There is one
   // worker thread per print job.
   scoped_ptr<PrintJobWorker> worker_;
 
   // Cache of the print context settings for access in the UI thread.
   PrintSettings settings_;
 
   // The printed document.
   scoped_refptr<PrintedDocument> document_;
 
   // Is the worker thread printing.
   bool is_job_pending_;
 
   // Is Canceling? If so, try to not cause recursion if on FAILED notification,
   // the notified calls Cancel() again.
   bool is_canceling_;
 
+  // Used at shutdown so that we can quit a nested message loop.
+  base::WeakPtrFactory<PrintJob> quit_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintJob);
 };
 
 // Details for a NOTIFY_PRINT_JOB_EVENT notification. The members may be NULL.
 class JobEventDetails : public base::RefCountedThreadSafe<JobEventDetails> {
  public:
   // Event type.
   enum Type {
     // Print... dialog box has been closed with OK button.
     USER_INIT_DONE,
@@ skipping 45 matching lines @@
   scoped_refptr<PrintedDocument> document_;
   scoped_refptr<PrintedPage> page_;
   const Type type_;
 
   DISALLOW_COPY_AND_ASSIGN(JobEventDetails);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_JOB_H_