| // Copyright 2013 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. |
| |
| #include "base/barrier_closure.h" |
| |
| #include "base/atomic_ref_count.h" |
| #include "base/bind.h" |
| |
| namespace { |
| |
| // Maintains state for a BarrierClosure. |
| class BarrierInfo { |
| public: |
| BarrierInfo(int num_callbacks_left, const base::Closure& done_closure); |
| void Run(); |
| |
| private: |
| base::AtomicRefCount num_callbacks_left_; |
| base::Closure done_closure_; |
| }; |
| |
| BarrierInfo::BarrierInfo(int num_callbacks, const base::Closure& done_closure) |
| : num_callbacks_left_(num_callbacks), |
| done_closure_(done_closure) { |
| } |
| |
| void BarrierInfo::Run() { |
| DCHECK(!base::AtomicRefCountIsZero(&num_callbacks_left_)); |
| if (!base::AtomicRefCountDec(&num_callbacks_left_)) { |
| done_closure_.Run(); |
| done_closure_.Reset(); |
| } |
| } |
| |
| } // namespace |
| |
| namespace base { |
| |
| base::Closure BarrierClosure(int num_callbacks_left, |
| const base::Closure& done_closure) { |
| DCHECK(num_callbacks_left >= 0); |
| |
| if (num_callbacks_left == 0) |
| done_closure.Run(); |
| |
| return base::Bind(&BarrierInfo::Run, |
| base::Owned( |
| new BarrierInfo(num_callbacks_left, done_closure))); |
| } |
| |
| } // namespace base |