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
content / public / test / browser_task_environment_unittest.cc [blame]
// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/public/test/browser_task_environment.h"
#include <string>
#include "base/atomicops.h"
#include "base/dcheck_is_on.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/synchronization/waitable_event.h"
#include "base/task/current_thread.h"
#include "base/task/thread_pool.h"
#include "base/test/bind.h"
#include "base/test/gtest_util.h"
#include "build/build_config.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using base::test::TaskEnvironment;
namespace content {
namespace {
// BrowserTaskEnvironmentTest.RunUntilIdle will run kNumTasks tasks that will
// hop back-and-forth between ThreadPool and UI thread kNumHops times.
// Note: These values are arbitrary.
constexpr int kNumHops = 13;
constexpr int kNumTasks = 8;
const char kDeathMatcher[] = "Check failed:.*\n*.*BrowserTaskEnvironment";
void PostTaskToUIThread(int iteration, base::subtle::Atomic32* tasks_run);
void PostToThreadPool(int iteration, base::subtle::Atomic32* tasks_run) {
// All iterations but the first come from a task that was posted.
if (iteration > 0)
base::subtle::NoBarrier_AtomicIncrement(tasks_run, 1);
if (iteration == kNumHops)
return;
base::ThreadPool::PostTask(
FROM_HERE, base::BindOnce(&PostTaskToUIThread, iteration + 1, tasks_run));
}
void PostTaskToUIThread(int iteration, base::subtle::Atomic32* tasks_run) {
// All iterations but the first come from a task that was posted.
if (iteration > 0)
base::subtle::NoBarrier_AtomicIncrement(tasks_run, 1);
if (iteration == kNumHops)
return;
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(&PostToThreadPool, iteration + 1, tasks_run));
}
} // namespace
TEST(BrowserTaskEnvironmentTest, RunUntilIdle) {
BrowserTaskEnvironment task_environment;
base::subtle::Atomic32 tasks_run = 0;
// Post half the tasks on ThreadPool and the other half on the UI thread
// so they cross and the last hops aren't all on the same task runner.
for (int i = 0; i < kNumTasks; ++i) {
if (i % 2) {
PostToThreadPool(0, &tasks_run);
} else {
PostTaskToUIThread(0, &tasks_run);
}
}
task_environment.RunUntilIdle();
EXPECT_EQ(kNumTasks * kNumHops, base::subtle::NoBarrier_Load(&tasks_run));
}
namespace {
void PostRecurringTaskToIOThread(int iteration, int* tasks_run) {
// All iterations but the first come from a task that was posted.
if (iteration > 0)
(*tasks_run)++;
if (iteration == kNumHops)
return;
GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&PostRecurringTaskToIOThread, iteration + 1, tasks_run));
}
} // namespace
TEST(BrowserTaskEnvironmentTest, RunIOThreadUntilIdle) {
BrowserTaskEnvironment task_environment(
BrowserTaskEnvironment::Options::REAL_IO_THREAD);
int tasks_run = 0;
for (int i = 0; i < kNumTasks; ++i) {
PostRecurringTaskToIOThread(0, &tasks_run);
}
task_environment.RunIOThreadUntilIdle();
EXPECT_EQ(kNumTasks * kNumHops, tasks_run);
}
TEST(BrowserTaskEnvironmentTest, MessageLoopTypeMismatch) {
base::test::TaskEnvironment task_environment(
base::test::TaskEnvironment::MainThreadType::UI);
BASE_EXPECT_DEATH(
{
BrowserTaskEnvironment second_task_environment(
BrowserTaskEnvironment::IO_MAINLOOP);
},
"");
}
TEST(BrowserTaskEnvironmentTest, MultipleBrowserTaskEnvironment) {
BASE_EXPECT_DEATH(
{
BrowserTaskEnvironment task_environment;
BrowserTaskEnvironment other_task_environment;
},
"");
}
TEST(BrowserTaskEnvironmentTest, TraitsConstructor) {
BrowserTaskEnvironment task_environment(
BrowserTaskEnvironment::Options::REAL_IO_THREAD,
base::test::TaskEnvironment::ThreadPoolExecutionMode::QUEUED);
// Should set up a UI main thread.
EXPECT_TRUE(base::CurrentUIThread::IsSet());
EXPECT_FALSE(base::CurrentIOThread::IsSet());
// Should create a real IO thread. If it was on the same thread the following
// will timeout.
base::WaitableEvent signaled_on_real_io_thread;
GetIOThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(&base::WaitableEvent::Signal,
Unretained(&signaled_on_real_io_thread)));
signaled_on_real_io_thread.TimedWait(base::Seconds(5));
EXPECT_TRUE(signaled_on_real_io_thread.IsSignaled());
// Tasks posted via ThreadPool::PostTask don't run in
// ThreadPoolExecutionMode::QUEUED until RunUntilIdle is called.
base::AtomicFlag task_ran;
base::ThreadPool::PostTask(
FROM_HERE, BindOnce([](base::AtomicFlag* task_ran) { task_ran->Set(); },
Unretained(&task_ran)));
base::PlatformThread::Sleep(base::Milliseconds(100));
EXPECT_FALSE(task_ran.IsSet());
task_environment.RunUntilIdle();
EXPECT_TRUE(task_ran.IsSet());
}
TEST(BrowserTaskEnvironmentTest, TraitsConstructorOverrideMainThreadType) {
BrowserTaskEnvironment task_environment(
base::test::TaskEnvironment::MainThreadType::UI,
base::test::TaskEnvironment::TimeSource::MOCK_TIME);
// Should set up a UI main thread.
EXPECT_TRUE(base::CurrentUIThread::IsSet());
EXPECT_FALSE(base::CurrentIOThread::IsSet());
// There should be a mock clock.
EXPECT_THAT(task_environment.GetMockClock(), testing::NotNull());
}
// Verify that posting tasks to the UI thread without having the
// BrowserTaskEnvironment instance cause a crash.
TEST(BrowserTaskEnvironmentTest, NotInitializedUIThread) {
base::test::TaskEnvironment task_environment(
base::test::TaskEnvironment::MainThreadType::UI);
EXPECT_DCHECK_DEATH_WITH(
GetUIThreadTaskRunner({})->PostTask(FROM_HERE, base::DoNothing()),
kDeathMatcher);
EXPECT_DCHECK_DEATH_WITH(
GetUIThreadTaskRunner({})->PostTask(FROM_HERE, base::DoNothing()),
kDeathMatcher);
}
// Verify that posting tasks to the IO thread without having the
// BrowserTaskEnvironment instance cause a crash.
TEST(BrowserTaskEnvironmentTest, NotInitializedIOThread) {
base::test::TaskEnvironment task_environment(
base::test::TaskEnvironment::MainThreadType::IO);
EXPECT_DCHECK_DEATH_WITH(
GetIOThreadTaskRunner({})->PostTask(FROM_HERE, base::DoNothing()),
kDeathMatcher);
EXPECT_DCHECK_DEATH_WITH(
GetIOThreadTaskRunner({})->PostTask(FROM_HERE, base::DoNothing()),
kDeathMatcher);
}
} // namespace content