groby@chromium.org | 042aa75 | 2013-08-25 00:00:33 +0900 | [diff] [blame] | 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 | #include "base/barrier_closure.h" |
| 6 | |
| 7 | #include "base/atomic_ref_count.h" |
| 8 | #include "base/bind.h" |
| 9 | |
| 10 | namespace { |
| 11 | |
| 12 | // Maintains state for a BarrierClosure. |
| 13 | class BarrierInfo { |
| 14 | public: |
| 15 | BarrierInfo(int num_callbacks_left, const base::Closure& done_closure); |
| 16 | void Run(); |
| 17 | |
| 18 | private: |
| 19 | base::AtomicRefCount num_callbacks_left_; |
| 20 | base::Closure done_closure_; |
| 21 | }; |
| 22 | |
| 23 | BarrierInfo::BarrierInfo(int num_callbacks, const base::Closure& done_closure) |
| 24 | : num_callbacks_left_(num_callbacks), |
| 25 | done_closure_(done_closure) { |
| 26 | } |
| 27 | |
| 28 | void BarrierInfo::Run() { |
| 29 | DCHECK(!base::AtomicRefCountIsZero(&num_callbacks_left_)); |
| 30 | if (!base::AtomicRefCountDec(&num_callbacks_left_)) { |
| 31 | done_closure_.Run(); |
| 32 | done_closure_.Reset(); |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | } // namespace |
| 37 | |
| 38 | namespace base { |
| 39 | |
| 40 | base::Closure BarrierClosure(int num_callbacks_left, |
| 41 | const base::Closure& done_closure) { |
| 42 | DCHECK(num_callbacks_left >= 0); |
| 43 | |
| 44 | if (num_callbacks_left == 0) |
| 45 | done_closure.Run(); |
| 46 | |
| 47 | return base::Bind(&BarrierInfo::Run, |
| 48 | base::Owned( |
| 49 | new BarrierInfo(num_callbacks_left, done_closure))); |
| 50 | } |
| 51 | |
hans@chromium.org | 92df995 | 2013-09-13 04:48:15 +0900 | [diff] [blame] | 52 | } // namespace base |