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.
5 #ifndef BASE_CRITICAL_CLOSURE_H_
6 #define BASE_CRITICAL_CLOSURE_H_
10 #include "base/callback.h"
11 #include "base/macros.h"
12 #include "build/build_config.h"
15 #include "base/bind.h"
16 #include "base/ios/scoped_critical_action.h"
24 // Returns true if multi-tasking is supported on this iOS device.
25 bool IsMultiTaskingSupported();
27 // This class wraps a closure so it can continue to run for a period of time
28 // when the application goes to the background by using
29 // |ios::ScopedCriticalAction|.
30 class CriticalClosure {
32 explicit CriticalClosure(OnceClosure closure);
37 ios::ScopedCriticalAction critical_action_;
40 DISALLOW_COPY_AND_ASSIGN(CriticalClosure);
42 #endif // defined(OS_IOS)
44 } // namespace internal
46 // Returns a closure that will continue to run for a period of time when the
47 // application goes to the background if possible on platforms where
48 // applications don't execute while backgrounded, otherwise the original task is
52 // file_task_runner_->PostTask(
54 // MakeCriticalClosure(base::Bind(&WriteToDiskTask, path_, data)));
56 // Note new closures might be posted in this closure. If the new closures need
57 // background running time, |MakeCriticalClosure| should be applied on them
60 inline OnceClosure MakeCriticalClosure(OnceClosure closure) {
61 DCHECK(internal::IsMultiTaskingSupported());
62 return base::BindOnce(
63 &internal::CriticalClosure::Run,
64 Owned(new internal::CriticalClosure(std::move(closure))));
66 #else // defined(OS_IOS)
67 inline OnceClosure MakeCriticalClosure(OnceClosure closure) {
68 // No-op for platforms where the application does not need to acquire
69 // background time for closures to finish when it goes into the background.
72 #endif // defined(OS_IOS)
76 #endif // BASE_CRITICAL_CLOSURE_H_