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
|
// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TASK_THREAD_POOL_CAN_RUN_POLICY_TEST_H_
#define BASE_TASK_THREAD_POOL_CAN_RUN_POLICY_TEST_H_
#include "base/synchronization/atomic_flag.h"
#include "base/task/task_runner.h"
#include "base/task/thread_pool/task_tracker.h"
#include "base/task/thread_pool/test_utils.h"
#include "base/test/bind.h"
#include "base/test/test_timeouts.h"
#include "base/test/test_waitable_event.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
namespace base {
namespace internal {
namespace test {
// Verify that tasks only run when allowed by the CanRunPolicy. |target| is the
// object on which DidUpdateCanRunPolicy() must be called after updating the
// CanRunPolicy in |task_tracker|. |create_task_runner| is a function that
// receives a TaskPriority and returns a TaskRunner. |task_tracker| is the
// TaskTracker.
template <typename Target, typename CreateTaskRunner>
void TestCanRunPolicyBasic(Target* target,
CreateTaskRunner create_task_runner,
TaskTracker* task_tracker) {
AtomicFlag foreground_can_run;
TestWaitableEvent foreground_did_run;
AtomicFlag best_effort_can_run;
TestWaitableEvent best_effort_did_run;
task_tracker->SetCanRunPolicy(CanRunPolicy::kNone);
target->DidUpdateCanRunPolicy();
const auto user_visible_task_runner =
create_task_runner(TaskPriority::USER_VISIBLE);
user_visible_task_runner->PostTask(FROM_HERE, BindLambdaForTesting([&] {
EXPECT_TRUE(foreground_can_run.IsSet());
foreground_did_run.Signal();
}));
const auto best_effort_task_runner =
create_task_runner(TaskPriority::BEST_EFFORT);
best_effort_task_runner->PostTask(FROM_HERE, BindLambdaForTesting([&] {
EXPECT_TRUE(best_effort_can_run.IsSet());
best_effort_did_run.Signal();
}));
PlatformThread::Sleep(TestTimeouts::tiny_timeout());
foreground_can_run.Set();
task_tracker->SetCanRunPolicy(CanRunPolicy::kForegroundOnly);
target->DidUpdateCanRunPolicy();
foreground_did_run.Wait();
PlatformThread::Sleep(TestTimeouts::tiny_timeout());
best_effort_can_run.Set();
task_tracker->SetCanRunPolicy(CanRunPolicy::kAll);
target->DidUpdateCanRunPolicy();
best_effort_did_run.Wait();
}
// Verify that if a task was allowed to run by the CanRunPolicy when it was
// posted, but the CanRunPolicy is updated to disallow it from running before it
// starts running, it doesn't run. |target| is the object on which
// DidUpdateCanRunPolicy() must be called after updating the CanRunPolicy in
// |task_tracker|. |create_task_runner| is a function that receives a
// TaskPriority and returns a *Sequenced*TaskRunner. |task_tracker| is the
// TaskTracker.
template <typename Target, typename CreateTaskRunner>
void TestCanRunPolicyChangedBeforeRun(Target* target,
CreateTaskRunner create_task_runner,
TaskTracker* task_tracker) {
constexpr struct {
// Descriptor for the test case.
const char* descriptor;
// Task priority being tested.
TaskPriority priority;
// Policy that disallows running tasks with |priority|.
CanRunPolicy disallow_policy;
// Policy that allows running tasks with |priority|.
CanRunPolicy allow_policy;
} kTestCases[] = {
{"BestEffort/kNone/kAll", TaskPriority::BEST_EFFORT, CanRunPolicy::kNone,
CanRunPolicy::kAll},
{"BestEffort/kForegroundOnly/kAll", TaskPriority::BEST_EFFORT,
CanRunPolicy::kForegroundOnly, CanRunPolicy::kAll},
{"UserVisible/kNone/kForegroundOnly", TaskPriority::USER_VISIBLE,
CanRunPolicy::kNone, CanRunPolicy::kForegroundOnly},
{"UserVisible/kNone/kAll", TaskPriority::USER_VISIBLE,
CanRunPolicy::kNone, CanRunPolicy::kAll}};
for (auto& test_case : kTestCases) {
SCOPED_TRACE(test_case.descriptor);
TestWaitableEvent first_task_started;
TestWaitableEvent first_task_blocked;
AtomicFlag second_task_can_run;
task_tracker->SetCanRunPolicy(test_case.allow_policy);
target->DidUpdateCanRunPolicy();
const auto task_runner = create_task_runner(test_case.priority);
task_runner->PostTask(FROM_HERE, BindLambdaForTesting([&] {
first_task_started.Signal();
first_task_blocked.Wait();
}));
task_runner->PostTask(FROM_HERE, BindLambdaForTesting([&] {
EXPECT_TRUE(second_task_can_run.IsSet());
}));
first_task_started.Wait();
task_tracker->SetCanRunPolicy(test_case.disallow_policy);
target->DidUpdateCanRunPolicy();
first_task_blocked.Signal();
PlatformThread::Sleep(TestTimeouts::tiny_timeout());
second_task_can_run.Set();
task_tracker->SetCanRunPolicy(test_case.allow_policy);
target->DidUpdateCanRunPolicy();
task_tracker->FlushForTesting();
}
}
// Regression test for https://crbug.com/950383
template <typename Target, typename CreateTaskRunner>
void TestCanRunPolicyLoad(Target* target,
CreateTaskRunner create_task_runner,
TaskTracker* task_tracker) {
constexpr struct {
// Descriptor for the test case.
const char* descriptor;
// Task priority being tested.
TaskPriority priority;
// Policy that allows running tasks with |priority|.
CanRunPolicy allow_policy;
// Policy that disallows running tasks with |priority|.
CanRunPolicy disallow_policy;
} kTestCases[] = {
{"BestEffort/kAll/kNone", TaskPriority::BEST_EFFORT, CanRunPolicy::kAll,
CanRunPolicy::kNone},
{"BestEffort/kAll/kForegroundOnly", TaskPriority::BEST_EFFORT,
CanRunPolicy::kAll, CanRunPolicy::kForegroundOnly},
{"UserVisible/kForegroundOnly/kNone", TaskPriority::USER_VISIBLE,
CanRunPolicy::kForegroundOnly, CanRunPolicy::kNone},
{"UserVisible/kAll/kNone", TaskPriority::USER_VISIBLE, CanRunPolicy::kAll,
CanRunPolicy::kNone}};
for (auto& test_case : kTestCases) {
SCOPED_TRACE(test_case.descriptor);
task_tracker->SetCanRunPolicy(test_case.allow_policy);
target->DidUpdateCanRunPolicy();
const auto task_runner = create_task_runner(test_case.priority);
// Post less tasks on iOS to avoid timeouts.
const size_t kLargeNumber =
#if BUILDFLAG(IS_IOS)
16;
#else
256;
#endif
for (size_t i = 0; i < kLargeNumber; ++i) {
task_runner->PostTask(FROM_HERE, DoNothing());
}
// Change the CanRunPolicy concurrently with running tasks.
// This should not cause crashes.
for (size_t i = 0; i < kLargeNumber; ++i) {
task_tracker->SetCanRunPolicy(test_case.disallow_policy);
target->DidUpdateCanRunPolicy();
task_tracker->SetCanRunPolicy(test_case.allow_policy);
target->DidUpdateCanRunPolicy();
}
task_tracker->FlushForTesting();
}
}
} // namespace test
} // namespace internal
} // namespace base
#endif // BASE_TASK_THREAD_POOL_CAN_RUN_POLICY_TEST_H_
|
