| // Copyright (c) 2012 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 BASE_CRITICAL_CLOSURE_H_ |
| #define BASE_CRITICAL_CLOSURE_H_ |
| |
| #include <utility> |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "build/build_config.h" |
| |
| #if defined(OS_IOS) |
| #include "base/bind.h" |
| #include "base/ios/scoped_critical_action.h" |
| #endif |
| |
| namespace base { |
| |
| namespace internal { |
| |
| #if defined(OS_IOS) |
| // Returns true if multi-tasking is supported on this iOS device. |
| bool IsMultiTaskingSupported(); |
| |
| // This class wraps a closure so it can continue to run for a period of time |
| // when the application goes to the background by using |
| // |ios::ScopedCriticalAction|. |
| class CriticalClosure { |
| public: |
| explicit CriticalClosure(OnceClosure closure); |
| ~CriticalClosure(); |
| void Run(); |
| |
| private: |
| ios::ScopedCriticalAction critical_action_; |
| OnceClosure closure_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CriticalClosure); |
| }; |
| #endif // defined(OS_IOS) |
| |
| } // namespace internal |
| |
| // Returns a closure that will continue to run for a period of time when the |
| // application goes to the background if possible on platforms where |
| // applications don't execute while backgrounded, otherwise the original task is |
| // returned. |
| // |
| // Example: |
| // file_task_runner_->PostTask( |
| // FROM_HERE, |
| // MakeCriticalClosure(base::BindOnce(&WriteToDiskTask, path_, data))); |
| // |
| // Note new closures might be posted in this closure. If the new closures need |
| // background running time, |MakeCriticalClosure| should be applied on them |
| // before posting. |
| #if defined(OS_IOS) |
| inline OnceClosure MakeCriticalClosure(OnceClosure closure) { |
| DCHECK(internal::IsMultiTaskingSupported()); |
| return base::BindOnce( |
| &internal::CriticalClosure::Run, |
| Owned(new internal::CriticalClosure(std::move(closure)))); |
| } |
| #else // defined(OS_IOS) |
| inline OnceClosure MakeCriticalClosure(OnceClosure closure) { |
| // No-op for platforms where the application does not need to acquire |
| // background time for closures to finish when it goes into the background. |
| return closure; |
| } |
| #endif // defined(OS_IOS) |
| |
| } // namespace base |
| |
| #endif // BASE_CRITICAL_CLOSURE_H_ |