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57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
// Copyright (c) 2011 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/pending_task.h"
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#include "base/message_loop/message_loop.h"
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namespace base {
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PendingTask::PendingTask(const Location& posted_from,
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OnceClosure task,
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TimeTicks delayed_run_time,
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Nestable nestable)
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: task(std::move(task)),
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posted_from(posted_from),
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delayed_run_time(delayed_run_time),
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sequence_num(0),
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nestable(nestable),
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is_high_res(false) {
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const PendingTask* parent_task =
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MessageLoop::current() ? MessageLoop::current()->current_pending_task_
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: nullptr;
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if (parent_task) {
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task_backtrace[0] = parent_task->posted_from.program_counter();
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std::copy(parent_task->task_backtrace.begin(),
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parent_task->task_backtrace.end() - 1,
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task_backtrace.begin() + 1);
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} else {
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task_backtrace.fill(nullptr);
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}
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}
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PendingTask::PendingTask(PendingTask&& other) = default;
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PendingTask::~PendingTask() = default;
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PendingTask& PendingTask::operator=(PendingTask&& other) = default;
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bool PendingTask::operator<(const PendingTask& other) const {
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// Since the top of a priority queue is defined as the "greatest" element, we
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// need to invert the comparison here. We want the smaller time to be at the
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// top of the heap.
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if (delayed_run_time < other.delayed_run_time)
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return false;
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if (delayed_run_time > other.delayed_run_time)
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return true;
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// If the times happen to match, then we use the sequence number to decide.
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// Compare the difference to support integer roll-over.
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return (sequence_num - other.sequence_num) > 0;
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}
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} // namespace base
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