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| 1 // Copyright (c) 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 |
| 52 } // namespace base |
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