Repo created

TMessagesProj/jni/voip/webrtc/base/barrier_closure.cc

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+// 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 <utility>
+
+#include "base/atomic_ref_count.h"
+#include "base/bind.h"
+#include "base/memory/ptr_util.h"
+
+namespace base {
+namespace {
+
+// Maintains state for a BarrierClosure.
+class BarrierInfo {
+ public:
+  BarrierInfo(int num_callbacks_left, OnceClosure done_closure);
+  void Run();
+
+ private:
+  AtomicRefCount num_callbacks_left_;
+  OnceClosure done_closure_;
+};
+
+BarrierInfo::BarrierInfo(int num_callbacks, OnceClosure done_closure)
+    : num_callbacks_left_(num_callbacks),
+      done_closure_(std::move(done_closure)) {}
+
+void BarrierInfo::Run() {
+  DCHECK(!num_callbacks_left_.IsZero());
+  if (!num_callbacks_left_.Decrement())
+    std::move(done_closure_).Run();
+}
+
+}  // namespace
+
+RepeatingClosure BarrierClosure(int num_callbacks_left,
+                                OnceClosure done_closure) {
+  DCHECK_GE(num_callbacks_left, 0);
+
+  if (num_callbacks_left == 0)
+    std::move(done_closure).Run();
+
+  return BindRepeating(
+      &BarrierInfo::Run,
+      Owned(new BarrierInfo(num_callbacks_left, std::move(done_closure))));
+}
+
+}  // namespace base