1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
// 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/location.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);
PendingTask(const Location& posted_from,
OnceClosure task,
TimeTicks queue_time,
TimeTicks delayed_run_time);
PendingTask(PendingTask&& other);
~PendingTask();
PendingTask& operator=(PendingTask&& other);
// Used to support sorting.
bool operator<(const PendingTask& other) const;
// Returns the time at which this task should run. This is |delayed_run_time|
// for a delayed task, |queue_time| otherwise.
base::TimeTicks GetDesiredExecutionTime() const;
// The task to run.
OnceClosure task;
// The site this PendingTask was posted from.
Location posted_from;
// The time at which the task was queued, which happens at post time. For
// deferred non-nestable tasks, this is reset when the nested loop exits and
// the deferred tasks are pushed back at the front of the queue. This is not
// set for immediate SequenceManager tasks unless SetAddQueueTimeToTasks(true)
// was called. This defaults to a null TimeTicks if the task hasn't been
// inserted in a sequence yet.
TimeTicks queue_time;
// The time when the task should be run. This is null for an immediate task.
base::TimeTicks delayed_run_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 not 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 not inherit the |ipc_hash| of pending task A.
uint32_t ipc_hash = 0;
const char* ipc_interface_name = nullptr;
// Secondary sort key for run time.
int sequence_num = 0;
bool task_backtrace_overflow = false;
};
} // namespace base
#endif // BASE_PENDING_TASK_H_
|
