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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 #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 |
| 11 namespace 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. |
| 25 BASE_EXPORT base::Closure BarrierClosure(int num_closures, |
| 26 const base::Closure& done_closure); |
| 27 |
| 28 } // namespace base |
| 29 |
| 30 #endif // BASE_BARRIER_CLOSURE_H_ |
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