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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "shell/app_child_process.h" | |
| 6 | |
| 7 #include <unistd.h> | |
| 8 | |
| 9 #include "base/bind.h" | |
| 10 #include "base/callback_helpers.h" | |
| 11 #include "base/files/file_path.h" | |
| 12 #include "base/location.h" | |
| 13 #include "base/logging.h" | |
| 14 #include "base/macros.h" | |
| 15 #include "base/memory/ref_counted.h" | |
| 16 #include "base/memory/scoped_ptr.h" | |
| 17 #include "base/message_loop/message_loop.h" | |
| 18 #include "base/single_thread_task_runner.h" | |
| 19 #include "base/synchronization/waitable_event.h" | |
| 20 #include "base/threading/thread.h" | |
| 21 #include "base/threading/thread_checker.h" | |
| 22 #include "mojo/common/message_pump_mojo.h" | |
| 23 #include "mojo/edk/embedder/embedder.h" | |
| 24 #include "mojo/edk/embedder/process_delegate.h" | |
| 25 #include "mojo/edk/embedder/simple_platform_support.h" | |
| 26 #include "mojo/public/cpp/system/core.h" | |
| 27 #include "shell/child_controller.mojom.h" | |
| 28 #include "shell/native_application_support.h" | |
| 29 | |
| 30 namespace mojo { | |
| 31 namespace shell { | |
| 32 | |
| 33 namespace { | |
| 34 | |
| 35 // Blocker --------------------------------------------------------------------- | |
| 36 | |
| 37 // Blocks a thread until another thread unblocks it, at which point it unblocks | |
| 38 // and runs a closure provided by that thread. | |
| 39 class Blocker { | |
| 40 public: | |
| 41 class Unblocker { | |
| 42 public: | |
| 43 explicit Unblocker(Blocker* blocker = nullptr) : blocker_(blocker) {} | |
| 44 ~Unblocker() {} | |
| 45 | |
| 46 void Unblock(base::Closure run_after) { | |
| 47 DCHECK(blocker_); | |
| 48 DCHECK(blocker_->run_after_.is_null()); | |
| 49 blocker_->run_after_ = run_after; | |
| 50 blocker_->event_.Signal(); | |
| 51 blocker_ = nullptr; | |
| 52 } | |
| 53 | |
| 54 private: | |
| 55 Blocker* blocker_; | |
| 56 | |
| 57 // Copy and assign allowed. | |
| 58 }; | |
| 59 | |
| 60 Blocker() : event_(true, false) {} | |
| 61 ~Blocker() {} | |
| 62 | |
| 63 void Block() { | |
| 64 DCHECK(run_after_.is_null()); | |
| 65 event_.Wait(); | |
| 66 run_after_.Run(); | |
| 67 } | |
| 68 | |
| 69 Unblocker GetUnblocker() { return Unblocker(this); } | |
| 70 | |
| 71 private: | |
| 72 base::WaitableEvent event_; | |
| 73 base::Closure run_after_; | |
| 74 | |
| 75 DISALLOW_COPY_AND_ASSIGN(Blocker); | |
| 76 }; | |
| 77 | |
| 78 // AppContext ------------------------------------------------------------------ | |
| 79 | |
| 80 class ChildControllerImpl; | |
| 81 | |
| 82 // Should be created and initialized on the main thread. | |
| 83 class AppContext : public embedder::ProcessDelegate { | |
| 84 public: | |
| 85 AppContext() | |
| 86 : io_thread_("io_thread"), controller_thread_("controller_thread") {} | |
| 87 ~AppContext() override {} | |
| 88 | |
| 89 void Init() { | |
| 90 // Initialize Mojo before starting any threads. | |
| 91 embedder::Init(make_scoped_ptr(new embedder::SimplePlatformSupport())); | |
| 92 | |
| 93 // Create and start our I/O thread. | |
| 94 base::Thread::Options io_thread_options(base::MessageLoop::TYPE_IO, 0); | |
| 95 CHECK(io_thread_.StartWithOptions(io_thread_options)); | |
| 96 io_runner_ = io_thread_.message_loop_proxy().get(); | |
| 97 CHECK(io_runner_.get()); | |
| 98 | |
| 99 // Create and start our controller thread. | |
| 100 base::Thread::Options controller_thread_options; | |
| 101 controller_thread_options.message_loop_type = | |
| 102 base::MessageLoop::TYPE_CUSTOM; | |
| 103 controller_thread_options.message_pump_factory = | |
| 104 base::Bind(&common::MessagePumpMojo::Create); | |
| 105 CHECK(controller_thread_.StartWithOptions(controller_thread_options)); | |
| 106 controller_runner_ = controller_thread_.message_loop_proxy().get(); | |
| 107 CHECK(controller_runner_.get()); | |
| 108 | |
| 109 // TODO(vtl): This should be SLAVE, not NONE. | |
| 110 embedder::InitIPCSupport(embedder::ProcessType::NONE, controller_runner_, | |
| 111 this, io_runner_, | |
| 112 embedder::ScopedPlatformHandle()); | |
| 113 } | |
| 114 | |
| 115 void Shutdown() { | |
| 116 Blocker blocker; | |
| 117 shutdown_unblocker_ = blocker.GetUnblocker(); | |
| 118 controller_runner_->PostTask( | |
| 119 FROM_HERE, base::Bind(&AppContext::ShutdownOnControllerThread, | |
| 120 base::Unretained(this))); | |
| 121 blocker.Block(); | |
| 122 } | |
| 123 | |
| 124 base::SingleThreadTaskRunner* io_runner() const { return io_runner_.get(); } | |
| 125 | |
| 126 base::SingleThreadTaskRunner* controller_runner() const { | |
| 127 return controller_runner_.get(); | |
| 128 } | |
| 129 | |
| 130 ChildControllerImpl* controller() const { return controller_.get(); } | |
| 131 | |
| 132 void set_controller(scoped_ptr<ChildControllerImpl> controller) { | |
| 133 controller_ = controller.Pass(); | |
| 134 } | |
| 135 | |
| 136 private: | |
| 137 void ShutdownOnControllerThread() { | |
| 138 // First, destroy the controller. | |
| 139 controller_.reset(); | |
| 140 | |
| 141 // Next shutdown IPC. We'll unblock the main thread in OnShutdownComplete(). | |
| 142 embedder::ShutdownIPCSupport(); | |
| 143 } | |
| 144 | |
| 145 // ProcessDelegate implementation. | |
| 146 void OnShutdownComplete() override { | |
| 147 shutdown_unblocker_.Unblock(base::Closure()); | |
| 148 } | |
| 149 | |
| 150 base::Thread io_thread_; | |
| 151 scoped_refptr<base::SingleThreadTaskRunner> io_runner_; | |
| 152 | |
| 153 base::Thread controller_thread_; | |
| 154 scoped_refptr<base::SingleThreadTaskRunner> controller_runner_; | |
| 155 | |
| 156 // Accessed only on the controller thread. | |
| 157 scoped_ptr<ChildControllerImpl> controller_; | |
| 158 | |
| 159 // Used to unblock the main thread on shutdown. | |
| 160 Blocker::Unblocker shutdown_unblocker_; | |
| 161 | |
| 162 DISALLOW_COPY_AND_ASSIGN(AppContext); | |
| 163 }; | |
| 164 | |
| 165 // ChildControllerImpl --------------------------------------------------------- | |
| 166 | |
| 167 class ChildControllerImpl : public ChildController, public ErrorHandler { | |
| 168 public: | |
| 169 ~ChildControllerImpl() override { | |
| 170 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 171 | |
| 172 // TODO(vtl): Pass in the result from |MainMain()|. | |
| 173 on_app_complete_.Run(MOJO_RESULT_UNIMPLEMENTED); | |
| 174 } | |
| 175 | |
| 176 // To be executed on the controller thread. Creates the |ChildController|, | |
| 177 // etc. | |
| 178 static void Init(AppContext* app_context, | |
| 179 embedder::ScopedPlatformHandle platform_channel, | |
| 180 const Blocker::Unblocker& unblocker) { | |
| 181 DCHECK(app_context); | |
| 182 DCHECK(platform_channel.is_valid()); | |
| 183 | |
| 184 DCHECK(!app_context->controller()); | |
| 185 | |
| 186 scoped_ptr<ChildControllerImpl> impl( | |
| 187 new ChildControllerImpl(app_context, unblocker)); | |
| 188 | |
| 189 ScopedMessagePipeHandle host_message_pipe(embedder::CreateChannel( | |
| 190 platform_channel.Pass(), app_context->io_runner(), | |
| 191 base::Bind(&ChildControllerImpl::DidCreateChannel, | |
| 192 base::Unretained(impl.get())), | |
| 193 base::MessageLoopProxy::current())); | |
| 194 | |
| 195 impl->Bind(host_message_pipe.Pass()); | |
| 196 | |
| 197 app_context->set_controller(impl.Pass()); | |
| 198 } | |
| 199 | |
| 200 void Bind(ScopedMessagePipeHandle handle) { binding_.Bind(handle.Pass()); } | |
| 201 | |
| 202 // |ErrorHandler| methods: | |
| 203 void OnConnectionError() override { | |
| 204 // A connection error means the connection to the shell is lost. This is not | |
| 205 // recoverable. | |
| 206 LOG(ERROR) << "Connection error to the shell."; | |
| 207 _exit(1); | |
| 208 } | |
| 209 | |
| 210 // |ChildController| methods: | |
| 211 void StartApp(const String& app_path, | |
| 212 bool clean_app_path, | |
| 213 InterfaceRequest<Application> application_request, | |
| 214 const StartAppCallback& on_app_complete) override { | |
| 215 DVLOG(2) << "ChildControllerImpl::StartApp(" << app_path << ", ...)"; | |
| 216 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 217 | |
| 218 on_app_complete_ = on_app_complete; | |
| 219 unblocker_.Unblock(base::Bind(&ChildControllerImpl::StartAppOnMainThread, | |
| 220 base::FilePath::FromUTF8Unsafe(app_path), | |
| 221 clean_app_path | |
| 222 ? NativeApplicationCleanup::DELETE | |
| 223 : NativeApplicationCleanup::DONT_DELETE, | |
| 224 base::Passed(&application_request))); | |
| 225 } | |
| 226 | |
| 227 void ExitNow(int32_t exit_code) override { | |
| 228 DVLOG(2) << "ChildControllerImpl::ExitNow(" << exit_code << ")"; | |
| 229 _exit(exit_code); | |
| 230 } | |
| 231 | |
| 232 private: | |
| 233 ChildControllerImpl(AppContext* app_context, | |
| 234 const Blocker::Unblocker& unblocker) | |
| 235 : app_context_(app_context), | |
| 236 unblocker_(unblocker), | |
| 237 channel_info_(nullptr), | |
| 238 binding_(this) { | |
| 239 binding_.set_error_handler(this); | |
| 240 } | |
| 241 | |
| 242 // Callback for |embedder::CreateChannel()|. | |
| 243 void DidCreateChannel(embedder::ChannelInfo* channel_info) { | |
| 244 DVLOG(2) << "ChildControllerImpl::DidCreateChannel()"; | |
| 245 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 246 channel_info_ = channel_info; | |
| 247 } | |
| 248 | |
| 249 static void StartAppOnMainThread( | |
| 250 const base::FilePath& app_path, | |
| 251 NativeApplicationCleanup cleanup, | |
| 252 InterfaceRequest<Application> application_request) { | |
| 253 // TODO(vtl): This is copied from in_process_native_runner.cc. | |
| 254 DVLOG(2) << "Loading/running Mojo app from " << app_path.value() | |
| 255 << " out of process"; | |
| 256 | |
| 257 // We intentionally don't unload the native library as its lifetime is the | |
| 258 // same as that of the process. | |
| 259 base::NativeLibrary app_library = LoadNativeApplication(app_path, cleanup); | |
| 260 RunNativeApplication(app_library, application_request.Pass()); | |
| 261 } | |
| 262 | |
| 263 base::ThreadChecker thread_checker_; | |
| 264 AppContext* const app_context_; | |
| 265 Blocker::Unblocker unblocker_; | |
| 266 StartAppCallback on_app_complete_; | |
| 267 | |
| 268 embedder::ChannelInfo* channel_info_; | |
| 269 Binding<ChildController> binding_; | |
| 270 | |
| 271 DISALLOW_COPY_AND_ASSIGN(ChildControllerImpl); | |
| 272 }; | |
| 273 | |
| 274 } // namespace | |
| 275 | |
| 276 // AppChildProcess ------------------------------------------------------------- | |
| 277 | |
| 278 AppChildProcess::AppChildProcess() { | |
| 279 } | |
| 280 | |
| 281 AppChildProcess::~AppChildProcess() { | |
| 282 } | |
| 283 | |
| 284 void AppChildProcess::Main() { | |
| 285 DVLOG(2) << "AppChildProcess::Main()"; | |
| 286 | |
| 287 DCHECK(!base::MessageLoop::current()); | |
| 288 | |
| 289 AppContext app_context; | |
| 290 app_context.Init(); | |
| 291 | |
| 292 Blocker blocker; | |
| 293 app_context.controller_runner()->PostTask( | |
| 294 FROM_HERE, | |
| 295 base::Bind(&ChildControllerImpl::Init, base::Unretained(&app_context), | |
| 296 base::Passed(platform_channel()), blocker.GetUnblocker())); | |
| 297 // This will block, then run whatever the controller wants. | |
| 298 blocker.Block(); | |
| 299 | |
| 300 app_context.Shutdown(); | |
| 301 } | |
| 302 | |
| 303 } // namespace shell | |
| 304 } // namespace mojo | |
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Chromium Code Reviews
Issue 1055463004:
Replace ChildProcess/AppChildProcess with a simple ChildMain(). (Closed)
Base URL: https://github.com/domokit/mojo.git@simplify_child_6-x-simplify_child_5