1// Copyright 2013 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#ifndef BASE_BARRIER_CLOSURE_H_
6#define BASE_BARRIER_CLOSURE_H_
7
8#include "base/base_export.h"
9#include "base/callback_forward.h"
10
11namespace base {
12
13// BarrierClosure executes |done_closure| after it has been invoked
14// |num_closures| times.
15//
16// If |num_closures| is 0, |done_closure| is executed immediately.
17//
18// BarrierClosure is thread-safe - the count of remaining closures is
19// maintained as a base::AtomicRefCount. |done_closure| will be run on
20// the thread that calls the final Run() on the returned closures.
21//
22// |done_closure| is also Reset() on the final calling thread but due to the
23// refcounted nature of callbacks, it is hard to know what thread resources
24// will be released on.
25BASE_EXPORT base::Closure BarrierClosure(int num_closures,
26                                         const base::Closure& done_closure);
27
28}  // namespace base
29
30#endif  // BASE_BARRIER_CLOSURE_H_
31