blob: 7d9f264becc1cc9ce5d7df0b8667e5bbd512e6b0 (
plain)
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
|
// Copyright (c) 2012 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 "net/dns/serial_worker.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/task_scheduler/post_task.h"
#include "base/threading/thread_task_runner_handle.h"
namespace net {
SerialWorker::SerialWorker() : state_(IDLE) {}
SerialWorker::~SerialWorker() = default;
void SerialWorker::WorkNow() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
switch (state_) {
case IDLE:
base::PostTaskWithTraitsAndReply(
FROM_HERE,
{base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
base::BindOnce(&SerialWorker::DoWork, this),
base::BindOnce(&SerialWorker::OnWorkJobFinished, this));
state_ = WORKING;
return;
case WORKING:
// Remember to re-read after |DoRead| finishes.
state_ = PENDING;
return;
case CANCELLED:
case PENDING:
return;
default:
NOTREACHED() << "Unexpected state " << state_;
}
}
void SerialWorker::Cancel() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
state_ = CANCELLED;
}
void SerialWorker::OnWorkJobFinished() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
switch (state_) {
case CANCELLED:
return;
case WORKING:
state_ = IDLE;
this->OnWorkFinished();
return;
case PENDING:
state_ = IDLE;
WorkNow();
return;
default:
NOTREACHED() << "Unexpected state " << state_;
}
}
} // namespace net
|
