46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
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// Copyright 2016 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/task/thread_pool/task.h"
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#include <utility>
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#include "base/atomic_sequence_num.h"
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namespace base {
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namespace internal {
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namespace {
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AtomicSequenceNumber g_sequence_nums_for_tracing;
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} // namespace
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Task::Task() = default;
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Task::Task(const Location& posted_from, OnceClosure task, TimeDelta delay)
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: PendingTask(posted_from,
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std::move(task),
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delay.is_zero() ? TimeTicks() : TimeTicks::Now() + delay,
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Nestable::kNonNestable) {
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// ThreadPoolImpl doesn't use |sequence_num| but tracing (toplevel.flow)
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// relies on it being unique. While this subtle dependency is a bit
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// overreaching, ThreadPoolImpl is the only task system that doesn't use
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// |sequence_num| and the dependent code rarely changes so this isn't worth a
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// big change and faking it here isn't too bad for now (posting tasks is full
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// of atomic ops already).
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this->sequence_num = g_sequence_nums_for_tracing.GetNext();
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}
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// This should be "= default but MSVC has trouble with "noexcept = default" in
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// this case.
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Task::Task(Task&& other) noexcept : PendingTask(std::move(other)) {}
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Task::~Task() = default;
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Task& Task::operator=(Task&& other) = default;
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} // namespace internal
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} // namespace base
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