Index: base/barrier_closure.h |
diff --git a/base/barrier_closure.h b/base/barrier_closure.h |
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+// Copyright (c) 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. |
+ |
+#ifndef BASE_BARRIER_CLOSURE_H_ |
+#define BASE_BARRIER_CLOSURE_H_ |
+ |
+#include "base/base_export.h" |
+#include "base/callback_forward.h" |
+ |
+namespace base { |
+ |
+// BarrierClosure executes |done_closure| after it has been invoked |
+// |num_closures| times. |
+// |
+// If |num_closures| is 0, |done_closure| is executed immediately. |
+// |
+// BarrierClosure is thread-safe - the count of remaining closures is |
+// maintained as a base::AtomicRefCount. |done_closure| will be run on |
+// the thread that calls the final Run() on the returned closures. |
+// |
+// |done_closure| is also Reset() on the final calling thread but due to the |
+// refcounted nature of callbacks, it is hard to know what thread resources |
+// will be released on. |
+BASE_EXPORT base::Closure BarrierClosure(int num_closures, |
+ const base::Closure& done_closure); |
+ |
+} // namespace base |
+ |
+#endif // BASE_BARRIER_CLOSURE_H_ |