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
|
/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "BtGdModule"
#include "module.h"
#include <bluetooth/log.h>
#include <com_android_bluetooth_flags.h>
using ::bluetooth::os::Handler;
using ::bluetooth::os::Thread;
namespace bluetooth {
constexpr std::chrono::milliseconds kModuleStopTimeout = std::chrono::milliseconds(2000);
ModuleFactory::ModuleFactory(std::function<Module*()> ctor) : ctor_(ctor) {}
Handler* Module::GetHandler() const {
log::assert_that(handler_ != nullptr, "Can't get handler when it's not started");
return handler_;
}
const ModuleRegistry* Module::GetModuleRegistry() const { return registry_; }
Module* Module::GetDependency(const ModuleFactory* module) const {
for (auto& dependency : dependencies_.list_) {
if (dependency == module) {
return registry_->Get(module);
}
}
log::fatal("Module was not listed as a dependency in ListDependencies");
}
Module* ModuleRegistry::Get(const ModuleFactory* module) const {
std::unique_lock<std::mutex> lock(started_modules_guard_, std::defer_lock);
if (com::android::bluetooth::flags::fix_started_module_race()) {
lock.lock();
}
auto instance = started_modules_.find(module);
log::assert_that(instance != started_modules_.end(),
"Request for module not started up, maybe not in Start(ModuleList)?");
return instance->second;
}
bool ModuleRegistry::IsStarted(const ModuleFactory* module) const {
std::unique_lock<std::mutex> lock(started_modules_guard_, std::defer_lock);
if (com::android::bluetooth::flags::fix_started_module_race()) {
lock.lock();
}
return started_modules_.find(module) != started_modules_.end();
}
void ModuleRegistry::Start(ModuleList* modules, Thread* thread, Handler* handler) {
for (auto it = modules->list_.begin(); it != modules->list_.end(); it++) {
Start(*it, thread, handler);
}
}
void ModuleRegistry::set_registry_and_handler(Module* instance, Thread* thread,
Handler* handler) const {
instance->registry_ = this;
if (com::android::bluetooth::flags::same_handler_for_all_modules()) {
// Use same handler for all modules initialization.
// TODO: remove the dependency on the `thread` when the flag is removed.
instance->handler_ = handler;
} else {
instance->handler_ = new Handler(thread);
}
}
Module* ModuleRegistry::Start(const ModuleFactory* module, Thread* thread, Handler* handler) {
{
std::unique_lock<std::mutex> lock(started_modules_guard_, std::defer_lock);
if (com::android::bluetooth::flags::fix_started_module_race()) {
lock.lock();
}
auto started_instance = started_modules_.find(module);
if (started_instance != started_modules_.end()) {
return started_instance->second;
}
}
log::info("Constructing next module");
Module* instance = module->ctor_();
set_registry_and_handler(instance, thread, handler);
log::info("Starting dependencies of {}", instance->ToString());
instance->ListDependencies(&instance->dependencies_);
Start(&instance->dependencies_, thread, handler);
log::info("Finished starting dependencies and calling Start() of {}", instance->ToString());
last_instance_ = "starting " + instance->ToString();
instance->Start();
start_order_.push_back(module);
{
std::unique_lock<std::mutex> lock(started_modules_guard_, std::defer_lock);
if (com::android::bluetooth::flags::fix_started_module_race()) {
lock.lock();
}
started_modules_[module] = instance;
}
log::info("Started {}", instance->ToString());
return instance;
}
void ModuleRegistry::StopAll() {
// Since modules were brought up in dependency order, it is safe to tear down by going in reverse
// order.
for (auto it = start_order_.rbegin(); it != start_order_.rend(); it++) {
auto module = Get(*it);
last_instance_ = "stopping " + module->ToString();
/*
* b/393449774 since we have now shifted to a single handler for all modules, we don't need
* to clear the handler here, it will be done in the respective teardown.
* Since we have a single handler, we need to make sure that the handler instance is deleted
* only once, otherwise we will see a crash as a handler can only be cleared once.
*/
if (!com::android::bluetooth::flags::same_handler_for_all_modules()) {
// Clear the handler before stopping the module to allow it to shut down gracefully.
log::info("Stopping Handler of Module {}", module->ToString());
module->handler_->Clear();
module->handler_->WaitUntilStopped(kModuleStopTimeout);
}
log::info("Stopping Module {}", module->ToString());
module->Stop();
}
std::unique_lock<std::mutex> lock(started_modules_guard_, std::defer_lock);
if (com::android::bluetooth::flags::fix_started_module_race()) {
lock.lock();
}
for (auto it = start_order_.rbegin(); it != start_order_.rend(); it++) {
auto instance = started_modules_.find(*it);
log::assert_that(instance != started_modules_.end(),
"assert failed: instance != started_modules_.end()");
if (!com::android::bluetooth::flags::same_handler_for_all_modules()) {
delete instance->second->handler_;
}
delete instance->second;
started_modules_.erase(instance);
}
log::assert_that(started_modules_.empty(), "assert failed: started_modules_.empty()");
start_order_.clear();
}
os::Handler* ModuleRegistry::GetModuleHandler(const ModuleFactory* module) const {
std::unique_lock<std::mutex> lock(started_modules_guard_, std::defer_lock);
if (com::android::bluetooth::flags::fix_started_module_race()) {
lock.lock();
}
auto started_instance = started_modules_.find(module);
if (started_instance != started_modules_.end()) {
return started_instance->second->GetHandler();
}
return nullptr;
}
// Override the StopAll method to use the test thread and handler.
// This function will take care of releasing the handler instances.
void TestModuleRegistry::StopAll() {
os::Handler* handler = GetTestHandler();
handler->Clear();
if (com::android::bluetooth::flags::same_handler_for_all_modules()) {
handler->WaitUntilStopped(kHandlerStopTimeout);
}
ModuleRegistry::StopAll(); // call the base class StopAll
delete handler;
}
} // namespace bluetooth
|