91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
// 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.
|
|
|
|
#ifndef BASE_PENDING_TASK_H_
|
|
#define BASE_PENDING_TASK_H_
|
|
|
|
#include <array>
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/callback.h"
|
|
#include "base/containers/queue.h"
|
|
#include "base/location.h"
|
|
#include "base/optional.h"
|
|
#include "base/time/time.h"
|
|
|
|
namespace base {
|
|
|
|
enum class Nestable : uint8_t {
|
|
kNonNestable,
|
|
kNestable,
|
|
};
|
|
|
|
// Contains data about a pending task. Stored in TaskQueue and DelayedTaskQueue
|
|
// for use by classes that queue and execute tasks.
|
|
struct BASE_EXPORT PendingTask {
|
|
PendingTask();
|
|
PendingTask(const Location& posted_from,
|
|
OnceClosure task,
|
|
TimeTicks delayed_run_time = TimeTicks(),
|
|
Nestable nestable = Nestable::kNestable);
|
|
PendingTask(PendingTask&& other);
|
|
~PendingTask();
|
|
|
|
PendingTask& operator=(PendingTask&& other);
|
|
|
|
// Used to support sorting.
|
|
bool operator<(const PendingTask& other) const;
|
|
|
|
// The task to run.
|
|
OnceClosure task;
|
|
|
|
// The site this PendingTask was posted from.
|
|
Location posted_from;
|
|
|
|
// The time when the task should be run. This is null for an immediate task.
|
|
base::TimeTicks delayed_run_time;
|
|
|
|
// The time at which the task was queued. For SequenceManager tasks and
|
|
// ThreadPool non-delayed tasks, this happens at post time. For
|
|
// ThreadPool delayed tasks, this happens some time after the task's delay
|
|
// has expired. This is not set for SequenceManager tasks if
|
|
// SetAddQueueTimeToTasks(true) wasn't call. This defaults to a null TimeTicks
|
|
// if the task hasn't been inserted in a sequence yet.
|
|
TimeTicks queue_time;
|
|
|
|
// Chain of symbols of the parent tasks which led to this one being posted.
|
|
static constexpr size_t kTaskBacktraceLength = 4;
|
|
std::array<const void*, kTaskBacktraceLength> task_backtrace = {};
|
|
|
|
// The context of the IPC message that was being handled when this task was
|
|
// posted. This is a hash of the IPC message name that is set within the scope
|
|
// of an IPC handler and when symbolized uniquely identifies the message being
|
|
// processed. This property is also propagated from one PendingTask to the
|
|
// next. For example, if pending task A was posted while handling an IPC,
|
|
// and pending task B was posted from within pending task A, then pending task
|
|
// B will inherit the |ipc_hash| of pending task A. In some sense this can be
|
|
// interpreted as a "root" task backtrace frame.
|
|
uint32_t ipc_hash = 0;
|
|
|
|
// Secondary sort key for run time.
|
|
int sequence_num = 0;
|
|
|
|
bool task_backtrace_overflow = false;
|
|
|
|
// OK to dispatch from a nested loop.
|
|
Nestable nestable;
|
|
|
|
// Needs high resolution timers.
|
|
bool is_high_res = false;
|
|
};
|
|
|
|
using TaskQueue = base::queue<PendingTask>;
|
|
|
|
// PendingTasks are sorted by their |delayed_run_time| property.
|
|
using DelayedTaskQueue = std::priority_queue<base::PendingTask>;
|
|
|
|
} // namespace base
|
|
|
|
#endif // BASE_PENDING_TASK_H_
|