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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
// 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 "remoting/base/auto_thread.h"
#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/synchronization/waitable_event.h"
#include "base/third_party/dynamic_annotations/dynamic_annotations.h"
#include "base/threading/thread_local.h"
#include "base/threading/thread_restrictions.h"
#include "build/build_config.h"
#include "remoting/base/auto_thread_task_runner.h"
#if defined(OS_WIN)
#include "base/win/scoped_com_initializer.h"
#endif
namespace remoting {
namespace {
#if defined(OS_WIN)
scoped_ptr<base::win::ScopedCOMInitializer> CreateComInitializer(
AutoThread::ComInitType type) {
scoped_ptr<base::win::ScopedCOMInitializer> initializer;
if (type == AutoThread::COM_INIT_MTA) {
initializer.reset(new base::win::ScopedCOMInitializer(
base::win::ScopedCOMInitializer::kMTA));
} else if (type == AutoThread::COM_INIT_STA) {
initializer.reset(new base::win::ScopedCOMInitializer());
}
return initializer;
}
#endif
}
// Used to pass data to ThreadMain. This structure is allocated on the stack
// from within StartWithType.
struct AutoThread::StartupData {
// Fields describing the desired thread behaviour.
base::MessageLoop::Type loop_type;
// Used to receive the AutoThreadTaskRunner for the thread.
scoped_refptr<AutoThreadTaskRunner> task_runner;
// Used to synchronize thread startup.
base::WaitableEvent event;
explicit StartupData(base::MessageLoop::Type type)
: loop_type(type), event(false, false) {}
};
// static
scoped_refptr<AutoThreadTaskRunner> AutoThread::CreateWithType(
const char* name,
scoped_refptr<AutoThreadTaskRunner> joiner,
base::MessageLoop::Type type) {
AutoThread* thread = new AutoThread(name, joiner.get());
scoped_refptr<AutoThreadTaskRunner> task_runner = thread->StartWithType(type);
if (!task_runner.get())
delete thread;
return task_runner;
}
// static
scoped_refptr<AutoThreadTaskRunner> AutoThread::Create(
const char* name, scoped_refptr<AutoThreadTaskRunner> joiner) {
return CreateWithType(name, joiner, base::MessageLoop::TYPE_DEFAULT);
}
#if defined(OS_WIN)
// static
scoped_refptr<AutoThreadTaskRunner> AutoThread::CreateWithLoopAndComInitTypes(
const char* name,
scoped_refptr<AutoThreadTaskRunner> joiner,
base::MessageLoop::Type loop_type,
ComInitType com_init_type) {
AutoThread* thread = new AutoThread(name, joiner.get());
thread->SetComInitType(com_init_type);
scoped_refptr<AutoThreadTaskRunner> task_runner =
thread->StartWithType(loop_type);
if (!task_runner.get())
delete thread;
return task_runner;
}
#endif
AutoThread::AutoThread(const char* name)
: startup_data_(NULL),
#if defined(OS_WIN)
com_init_type_(COM_INIT_NONE),
#endif
thread_(),
name_(name),
was_quit_properly_(false) {
}
AutoThread::AutoThread(const char* name, AutoThreadTaskRunner* joiner)
: startup_data_(NULL),
#if defined(OS_WIN)
com_init_type_(COM_INIT_NONE),
#endif
thread_(),
name_(name),
was_quit_properly_(false),
joiner_(joiner) {
}
AutoThread::~AutoThread() {
DCHECK(!startup_data_);
// Wait for the thread to exit.
if (!thread_.is_null()) {
base::PlatformThread::Join(thread_);
}
}
scoped_refptr<AutoThreadTaskRunner> AutoThread::StartWithType(
base::MessageLoop::Type type) {
DCHECK(thread_.is_null());
#if defined(OS_WIN)
DCHECK(com_init_type_ != COM_INIT_STA || type == base::MessageLoop::TYPE_UI);
#endif
StartupData startup_data(type);
startup_data_ = &startup_data;
if (!base::PlatformThread::Create(0, this, &thread_)) {
DLOG(ERROR) << "failed to create thread";
startup_data_ = NULL;
return NULL;
}
// Wait for the thread to start and initialize message_loop_
// TODO(wez): Since at this point we know the MessageLoop _will_ run, and
// the thread lifetime is controlled by the AutoThreadTaskRunner, we would
// ideally return the AutoThreadTaskRunner to the caller without waiting for
// the thread to signal us.
base::ThreadRestrictions::ScopedAllowWait allow_wait;
startup_data.event.Wait();
// set it to NULL so we don't keep a pointer to some object on the stack.
startup_data_ = NULL;
DCHECK(startup_data.task_runner.get());
return startup_data.task_runner;
}
#if defined(OS_WIN)
void AutoThread::SetComInitType(ComInitType com_init_type) {
DCHECK_EQ(com_init_type_, COM_INIT_NONE);
com_init_type_ = com_init_type;
}
#endif
void AutoThread::QuitThread(
scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
if (!task_runner->BelongsToCurrentThread()) {
task_runner->PostTask(FROM_HERE, base::Bind(&AutoThread::QuitThread,
base::Unretained(this),
task_runner));
return;
}
base::MessageLoop::current()->QuitWhenIdle();
was_quit_properly_ = true;
if (joiner_.get()) {
joiner_->PostTask(
FROM_HERE,
base::Bind(&AutoThread::JoinAndDeleteThread, base::Unretained(this)));
}
}
void AutoThread::JoinAndDeleteThread() {
delete this;
}
void AutoThread::ThreadMain() {
// The message loop for this thread.
base::MessageLoop message_loop(startup_data_->loop_type);
// Complete the initialization of our AutoThread object.
base::PlatformThread::SetName(name_);
ANNOTATE_THREAD_NAME(name_.c_str()); // Tell the name to race detector.
message_loop.set_thread_name(name_);
// Return an AutoThreadTaskRunner that will cleanly quit this thread when
// no more references to it remain.
startup_data_->task_runner =
new AutoThreadTaskRunner(message_loop.task_runner(),
base::Bind(&AutoThread::QuitThread,
base::Unretained(this),
message_loop.task_runner()));
startup_data_->event.Signal();
// startup_data_ can't be touched anymore since the starting thread is now
// unlocked.
#if defined(OS_WIN)
// Initialize COM on the thread, if requested.
scoped_ptr<base::win::ScopedCOMInitializer> com_initializer(
CreateComInitializer(com_init_type_));
#endif
message_loop.Run();
// Assert that MessageLoop::QuitWhenIdle was called by AutoThread::QuitThread.
DCHECK(was_quit_properly_);
}
} // namespace base
|
