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     background_scope_.reset(new base::ios::ScopedCriticalAction());
  22   }
  23
  24   void Run() {
  25     closure_->Run();
  26
  27     background_scope_.reset();
  28   }
  29
  30  private:
  31   friend class base::RefCountedThreadSafe<CriticalClosure>;
  32
  33   virtual ~CriticalClosure() {}
  34
  35   scoped_ptr<base::Closure> closure_;
  36   scoped_ptr<base::ios::ScopedCriticalAction> background_scope_;
  37
  38   DISALLOW_COPY_AND_ASSIGN(CriticalClosure);
  39 };
  40
  41 }  // namespace
  42
  43 namespace base {
  44
  45 base::Closure MakeCriticalClosure(const base::Closure& closure) {
  46   DCHECK([[UIDevice currentDevice] isMultitaskingSupported]);
  47   scoped_refptr<CriticalClosure> critical_closure(
  48       new CriticalClosure(new base::Closure(closure)));
  49   return base::Bind(&CriticalClosure::Run, critical_closure.get());
  50 }
  51
  52 }  // namespace base