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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(!AtomicRefCountIsZero(&num_callbacks_left_));
if (!AtomicRefCountDec(&num_callbacks_left_))
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
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