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// Copyright (c) 2011 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/pending_task.h"
#include "base/tracked_objects.h"
namespace base {
#if _MSC_VER >= 1700
// This a temporary fix for compiling on VS2012. http://crbug.com/154744
PendingTask::PendingTask() : sequence_num(-1), nestable(false) {
}
#endif
PendingTask::PendingTask(const tracked_objects::Location& posted_from,
const base::Closure& task)
: base::TrackingInfo(posted_from, TimeTicks()),
task(task),
posted_from(posted_from),
sequence_num(0),
nestable(true) {
}
PendingTask::PendingTask(const tracked_objects::Location& posted_from,
const base::Closure& task,
TimeTicks delayed_run_time,
bool nestable)
: base::TrackingInfo(posted_from, delayed_run_time),
task(task),
posted_from(posted_from),
sequence_num(0),
nestable(nestable) {
}
PendingTask::~PendingTask() {
}
bool PendingTask::operator<(const PendingTask& other) const {
// Since the top of a priority queue is defined as the "greatest" element, we
// need to invert the comparison here. We want the smaller time to be at the
// top of the heap.
if (delayed_run_time < other.delayed_run_time)
return false;
if (delayed_run_time > other.delayed_run_time)
return true;
// If the times happen to match, then we use the sequence number to decide.
// Compare the difference to support integer roll-over.
return (sequence_num - other.sequence_num) > 0;
}
void TaskQueue::Swap(TaskQueue* queue) {
c.swap(queue->c); // Calls std::deque::swap.
}
} // namespace base
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