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