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 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_ 31