base/critical_closure_ios.mm

   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 "base/critical_closure.h"
   6
   7 #import <UIKit/UIKit.h>
   8
   9 #include "base/bind.h"
  10 #include "base/ios/scoped_critical_action.h"
  11 #include "base/memory/ref_counted.h"
  12
  13 namespace {
  14
  15 // This class wraps a closure so it can continue to run for a period of time
  16 // when the application goes to the background by using
  17 // |base::ios::ScopedCriticalAction|.
  18 class CriticalClosure : public base::RefCountedThreadSafe<CriticalClosure> {
  19  public:
  20   explicit CriticalClosure(base::Closure* closure) : closure_(closure) {
  21   }
  22
  23   void Run() {
  24     closure_->Run();
  25   }
  26
  27  private:
  28   friend class base::RefCountedThreadSafe<CriticalClosure>;
  29
  30   virtual ~CriticalClosure() {}
  31
  32   base::ios::ScopedCriticalAction criticial_action_;
  33   scoped_ptr<base::Closure> closure_;
  34
  35   DISALLOW_COPY_AND_ASSIGN(CriticalClosure);
  36 };
  37
  38 }  // namespace
  39
  40 namespace base {
  41
  42 base::Closure MakeCriticalClosure(const base::Closure& closure) {
  43   DCHECK([[UIDevice currentDevice] isMultitaskingSupported]);
  44   scoped_refptr<CriticalClosure> critical_closure(
  45       new CriticalClosure(new base::Closure(closure)));
  46   return base::Bind(&CriticalClosure::Run, critical_closure.get());
  47 }
  48
  49 }  // namespace base