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54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/barrier_closure.h"
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#include "base/atomic_ref_count.h"
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#include "base/bind.h"
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namespace {
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// Maintains state for a BarrierClosure.
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class BarrierInfo {
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public:
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BarrierInfo(int num_callbacks_left, const base::Closure& done_closure);
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void Run();
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private:
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base::AtomicRefCount num_callbacks_left_;
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base::Closure done_closure_;
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};
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BarrierInfo::BarrierInfo(int num_callbacks, const base::Closure& done_closure)
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: num_callbacks_left_(num_callbacks),
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done_closure_(done_closure) {
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}
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void BarrierInfo::Run() {
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DCHECK(!base::AtomicRefCountIsZero(&num_callbacks_left_));
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if (!base::AtomicRefCountDec(&num_callbacks_left_)) {
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base::Closure done_closure = done_closure_;
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done_closure_.Reset();
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done_closure.Run();
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}
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}
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} // namespace
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namespace base {
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base::Closure BarrierClosure(int num_callbacks_left,
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const base::Closure& done_closure) {
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DCHECK_GE(num_callbacks_left, 0);
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if (num_callbacks_left == 0)
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done_closure.Run();
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return base::Bind(&BarrierInfo::Run,
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base::Owned(
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new BarrierInfo(num_callbacks_left, done_closure)));
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}
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} // namespace base
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