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| 1 // Copyright 2013 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 "mojo/edk/system/raw_channel.h" | |
| 6 | |
| 7 #include <windows.h> | |
| 8 | |
| 9 #include "base/auto_reset.h" | |
| 10 #include "base/bind.h" | |
| 11 #include "base/compiler_specific.h" | |
| 12 #include "base/lazy_instance.h" | |
| 13 #include "base/location.h" | |
| 14 #include "base/logging.h" | |
| 15 #include "base/macros.h" | |
| 16 #include "base/memory/scoped_ptr.h" | |
| 17 #include "base/message_loop/message_loop.h" | |
| 18 #include "base/synchronization/lock.h" | |
| 19 #include "base/win/windows_version.h" | |
| 20 #include "mojo/edk/embedder/platform_handle.h" | |
| 21 | |
| 22 namespace mojo { | |
| 23 namespace system { | |
| 24 | |
| 25 namespace { | |
| 26 | |
| 27 class VistaOrHigherFunctions { | |
| 28 public: | |
| 29 VistaOrHigherFunctions(); | |
| 30 | |
| 31 bool is_vista_or_higher() const { return is_vista_or_higher_; } | |
| 32 | |
| 33 BOOL SetFileCompletionNotificationModes(HANDLE handle, UCHAR flags) { | |
| 34 return set_file_completion_notification_modes_(handle, flags); | |
| 35 } | |
| 36 | |
| 37 BOOL CancelIoEx(HANDLE handle, LPOVERLAPPED overlapped) { | |
| 38 return cancel_io_ex_(handle, overlapped); | |
| 39 } | |
| 40 | |
| 41 private: | |
| 42 typedef BOOL(WINAPI* SetFileCompletionNotificationModesFunc)(HANDLE, UCHAR); | |
| 43 typedef BOOL(WINAPI* CancelIoExFunc)(HANDLE, LPOVERLAPPED); | |
| 44 | |
| 45 bool is_vista_or_higher_; | |
| 46 SetFileCompletionNotificationModesFunc | |
| 47 set_file_completion_notification_modes_; | |
| 48 CancelIoExFunc cancel_io_ex_; | |
| 49 }; | |
| 50 | |
| 51 VistaOrHigherFunctions::VistaOrHigherFunctions() | |
| 52 : is_vista_or_higher_(base::win::GetVersion() >= base::win::VERSION_VISTA), | |
| 53 set_file_completion_notification_modes_(nullptr), | |
| 54 cancel_io_ex_(nullptr) { | |
| 55 if (!is_vista_or_higher_) | |
| 56 return; | |
| 57 | |
| 58 HMODULE module = GetModuleHandleW(L"kernel32.dll"); | |
| 59 set_file_completion_notification_modes_ = | |
| 60 reinterpret_cast<SetFileCompletionNotificationModesFunc>( | |
| 61 GetProcAddress(module, "SetFileCompletionNotificationModes")); | |
| 62 DCHECK(set_file_completion_notification_modes_); | |
| 63 | |
| 64 cancel_io_ex_ = | |
| 65 reinterpret_cast<CancelIoExFunc>(GetProcAddress(module, "CancelIoEx")); | |
| 66 DCHECK(cancel_io_ex_); | |
| 67 } | |
| 68 | |
| 69 base::LazyInstance<VistaOrHigherFunctions> g_vista_or_higher_functions = | |
| 70 LAZY_INSTANCE_INITIALIZER; | |
| 71 | |
| 72 class RawChannelWin : public RawChannel { | |
| 73 public: | |
| 74 RawChannelWin(embedder::ScopedPlatformHandle handle); | |
| 75 ~RawChannelWin() override; | |
| 76 | |
| 77 // |RawChannel| public methods: | |
| 78 size_t GetSerializedPlatformHandleSize() const override; | |
| 79 | |
| 80 private: | |
| 81 // RawChannelIOHandler receives OS notifications for I/O completion. It must | |
| 82 // be created on the I/O thread. | |
| 83 // | |
| 84 // It manages its own destruction. Destruction happens on the I/O thread when | |
| 85 // all the following conditions are satisfied: | |
| 86 // - |DetachFromOwnerNoLock()| has been called; | |
| 87 // - there is no pending read; | |
| 88 // - there is no pending write. | |
| 89 class RawChannelIOHandler : public base::MessageLoopForIO::IOHandler { | |
| 90 public: | |
| 91 RawChannelIOHandler(RawChannelWin* owner, | |
| 92 embedder::ScopedPlatformHandle handle); | |
| 93 | |
| 94 HANDLE handle() const { return handle_.get().handle; } | |
| 95 | |
| 96 // The following methods are only called by the owner on the I/O thread. | |
| 97 bool pending_read() const; | |
| 98 base::MessageLoopForIO::IOContext* read_context(); | |
| 99 // Instructs the object to wait for an |OnIOCompleted()| notification. | |
| 100 void OnPendingReadStarted(); | |
| 101 | |
| 102 // The following methods are only called by the owner under | |
| 103 // |owner_->write_lock()|. | |
| 104 bool pending_write_no_lock() const; | |
| 105 base::MessageLoopForIO::IOContext* write_context_no_lock(); | |
| 106 // Instructs the object to wait for an |OnIOCompleted()| notification. | |
| 107 void OnPendingWriteStartedNoLock(); | |
| 108 | |
| 109 // |base::MessageLoopForIO::IOHandler| implementation: | |
| 110 // Must be called on the I/O thread. It could be called before or after | |
| 111 // detached from the owner. | |
| 112 void OnIOCompleted(base::MessageLoopForIO::IOContext* context, | |
| 113 DWORD bytes_transferred, | |
| 114 DWORD error) override; | |
| 115 | |
| 116 // Must be called on the I/O thread under |owner_->write_lock()|. | |
| 117 // After this call, the owner must not make any further calls on this | |
| 118 // object, and therefore the object is used on the I/O thread exclusively | |
| 119 // (if it stays alive). | |
| 120 void DetachFromOwnerNoLock(scoped_ptr<ReadBuffer> read_buffer, | |
| 121 scoped_ptr<WriteBuffer> write_buffer); | |
| 122 | |
| 123 private: | |
| 124 ~RawChannelIOHandler() override; | |
| 125 | |
| 126 // Returns true if |owner_| has been reset and there is not pending read or | |
| 127 // write. | |
| 128 // Must be called on the I/O thread. | |
| 129 bool ShouldSelfDestruct() const; | |
| 130 | |
| 131 // Must be called on the I/O thread. It may be called before or after | |
| 132 // detaching from the owner. | |
| 133 void OnReadCompleted(DWORD bytes_read, DWORD error); | |
| 134 // Must be called on the I/O thread. It may be called before or after | |
| 135 // detaching from the owner. | |
| 136 void OnWriteCompleted(DWORD bytes_written, DWORD error); | |
| 137 | |
| 138 embedder::ScopedPlatformHandle handle_; | |
| 139 | |
| 140 // |owner_| is reset on the I/O thread under |owner_->write_lock()|. | |
| 141 // Therefore, it may be used on any thread under lock; or on the I/O thread | |
| 142 // without locking. | |
| 143 RawChannelWin* owner_; | |
| 144 | |
| 145 // The following members must be used on the I/O thread. | |
| 146 scoped_ptr<ReadBuffer> preserved_read_buffer_after_detach_; | |
| 147 scoped_ptr<WriteBuffer> preserved_write_buffer_after_detach_; | |
| 148 bool suppress_self_destruct_; | |
| 149 | |
| 150 bool pending_read_; | |
| 151 base::MessageLoopForIO::IOContext read_context_; | |
| 152 | |
| 153 // The following members must be used under |owner_->write_lock()| while the | |
| 154 // object is still attached to the owner, and only on the I/O thread | |
| 155 // afterwards. | |
| 156 bool pending_write_; | |
| 157 base::MessageLoopForIO::IOContext write_context_; | |
| 158 | |
| 159 DISALLOW_COPY_AND_ASSIGN(RawChannelIOHandler); | |
| 160 }; | |
| 161 | |
| 162 // |RawChannel| private methods: | |
| 163 IOResult Read(size_t* bytes_read) override; | |
| 164 IOResult ScheduleRead() override; | |
| 165 embedder::ScopedPlatformHandleVectorPtr GetReadPlatformHandles( | |
| 166 size_t num_platform_handles, | |
| 167 const void* platform_handle_table) override; | |
| 168 IOResult WriteNoLock(size_t* platform_handles_written, | |
| 169 size_t* bytes_written) override; | |
| 170 IOResult ScheduleWriteNoLock() override; | |
| 171 void OnInit() override; | |
| 172 void OnShutdownNoLock(scoped_ptr<ReadBuffer> read_buffer, | |
| 173 scoped_ptr<WriteBuffer> write_buffer) override; | |
| 174 | |
| 175 // Passed to |io_handler_| during initialization. | |
| 176 embedder::ScopedPlatformHandle handle_; | |
| 177 | |
| 178 RawChannelIOHandler* io_handler_; | |
| 179 | |
| 180 const bool skip_completion_port_on_success_; | |
| 181 | |
| 182 DISALLOW_COPY_AND_ASSIGN(RawChannelWin); | |
| 183 }; | |
| 184 | |
| 185 RawChannelWin::RawChannelIOHandler::RawChannelIOHandler( | |
| 186 RawChannelWin* owner, | |
| 187 embedder::ScopedPlatformHandle handle) | |
| 188 : handle_(handle.Pass()), | |
| 189 owner_(owner), | |
| 190 suppress_self_destruct_(false), | |
| 191 pending_read_(false), | |
| 192 pending_write_(false) { | |
| 193 memset(&read_context_.overlapped, 0, sizeof(read_context_.overlapped)); | |
| 194 read_context_.handler = this; | |
| 195 memset(&write_context_.overlapped, 0, sizeof(write_context_.overlapped)); | |
| 196 write_context_.handler = this; | |
| 197 | |
| 198 owner_->message_loop_for_io()->RegisterIOHandler(handle_.get().handle, this); | |
| 199 } | |
| 200 | |
| 201 RawChannelWin::RawChannelIOHandler::~RawChannelIOHandler() { | |
| 202 DCHECK(ShouldSelfDestruct()); | |
| 203 } | |
| 204 | |
| 205 bool RawChannelWin::RawChannelIOHandler::pending_read() const { | |
| 206 DCHECK(owner_); | |
| 207 DCHECK_EQ(base::MessageLoop::current(), owner_->message_loop_for_io()); | |
| 208 return pending_read_; | |
| 209 } | |
| 210 | |
| 211 base::MessageLoopForIO::IOContext* | |
| 212 RawChannelWin::RawChannelIOHandler::read_context() { | |
| 213 DCHECK(owner_); | |
| 214 DCHECK_EQ(base::MessageLoop::current(), owner_->message_loop_for_io()); | |
| 215 return &read_context_; | |
| 216 } | |
| 217 | |
| 218 void RawChannelWin::RawChannelIOHandler::OnPendingReadStarted() { | |
| 219 DCHECK(owner_); | |
| 220 DCHECK_EQ(base::MessageLoop::current(), owner_->message_loop_for_io()); | |
| 221 DCHECK(!pending_read_); | |
| 222 pending_read_ = true; | |
| 223 } | |
| 224 | |
| 225 bool RawChannelWin::RawChannelIOHandler::pending_write_no_lock() const { | |
| 226 DCHECK(owner_); | |
| 227 owner_->write_lock().AssertAcquired(); | |
| 228 return pending_write_; | |
| 229 } | |
| 230 | |
| 231 base::MessageLoopForIO::IOContext* | |
| 232 RawChannelWin::RawChannelIOHandler::write_context_no_lock() { | |
| 233 DCHECK(owner_); | |
| 234 owner_->write_lock().AssertAcquired(); | |
| 235 return &write_context_; | |
| 236 } | |
| 237 | |
| 238 void RawChannelWin::RawChannelIOHandler::OnPendingWriteStartedNoLock() { | |
| 239 DCHECK(owner_); | |
| 240 owner_->write_lock().AssertAcquired(); | |
| 241 DCHECK(!pending_write_); | |
| 242 pending_write_ = true; | |
| 243 } | |
| 244 | |
| 245 void RawChannelWin::RawChannelIOHandler::OnIOCompleted( | |
| 246 base::MessageLoopForIO::IOContext* context, | |
| 247 DWORD bytes_transferred, | |
| 248 DWORD error) { | |
| 249 DCHECK(!owner_ || | |
| 250 base::MessageLoop::current() == owner_->message_loop_for_io()); | |
| 251 | |
| 252 { | |
| 253 // Suppress self-destruction inside |OnReadCompleted()|, etc. (in case they | |
| 254 // result in a call to |Shutdown()|). | |
| 255 base::AutoReset<bool> resetter(&suppress_self_destruct_, true); | |
| 256 | |
| 257 if (context == &read_context_) | |
| 258 OnReadCompleted(bytes_transferred, error); | |
| 259 else if (context == &write_context_) | |
| 260 OnWriteCompleted(bytes_transferred, error); | |
| 261 else | |
| 262 NOTREACHED(); | |
| 263 } | |
| 264 | |
| 265 if (ShouldSelfDestruct()) | |
| 266 delete this; | |
| 267 } | |
| 268 | |
| 269 void RawChannelWin::RawChannelIOHandler::DetachFromOwnerNoLock( | |
| 270 scoped_ptr<ReadBuffer> read_buffer, | |
| 271 scoped_ptr<WriteBuffer> write_buffer) { | |
| 272 DCHECK(owner_); | |
| 273 DCHECK_EQ(base::MessageLoop::current(), owner_->message_loop_for_io()); | |
| 274 owner_->write_lock().AssertAcquired(); | |
| 275 | |
| 276 // If read/write is pending, we have to retain the corresponding buffer. | |
| 277 if (pending_read_) | |
| 278 preserved_read_buffer_after_detach_ = read_buffer.Pass(); | |
| 279 if (pending_write_) | |
| 280 preserved_write_buffer_after_detach_ = write_buffer.Pass(); | |
| 281 | |
| 282 owner_ = nullptr; | |
| 283 if (ShouldSelfDestruct()) | |
| 284 delete this; | |
| 285 } | |
| 286 | |
| 287 bool RawChannelWin::RawChannelIOHandler::ShouldSelfDestruct() const { | |
| 288 if (owner_ || suppress_self_destruct_) | |
| 289 return false; | |
| 290 | |
| 291 // Note: Detached, hence no lock needed for |pending_write_|. | |
| 292 return !pending_read_ && !pending_write_; | |
| 293 } | |
| 294 | |
| 295 void RawChannelWin::RawChannelIOHandler::OnReadCompleted(DWORD bytes_read, | |
| 296 DWORD error) { | |
| 297 DCHECK(!owner_ || | |
| 298 base::MessageLoop::current() == owner_->message_loop_for_io()); | |
| 299 DCHECK(suppress_self_destruct_); | |
| 300 | |
| 301 CHECK(pending_read_); | |
| 302 pending_read_ = false; | |
| 303 if (!owner_) | |
| 304 return; | |
| 305 | |
| 306 if (error == ERROR_SUCCESS) { | |
| 307 DCHECK_GT(bytes_read, 0u); | |
| 308 owner_->OnReadCompleted(IO_SUCCEEDED, bytes_read); | |
| 309 } else if (error == ERROR_BROKEN_PIPE) { | |
| 310 DCHECK_EQ(bytes_read, 0u); | |
| 311 owner_->OnReadCompleted(IO_FAILED_SHUTDOWN, 0); | |
| 312 } else { | |
| 313 DCHECK_EQ(bytes_read, 0u); | |
| 314 LOG(WARNING) << "ReadFile: " << logging::SystemErrorCodeToString(error); | |
| 315 owner_->OnReadCompleted(IO_FAILED_UNKNOWN, 0); | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 void RawChannelWin::RawChannelIOHandler::OnWriteCompleted(DWORD bytes_written, | |
| 320 DWORD error) { | |
| 321 DCHECK(!owner_ || | |
| 322 base::MessageLoop::current() == owner_->message_loop_for_io()); | |
| 323 DCHECK(suppress_self_destruct_); | |
| 324 | |
| 325 if (!owner_) { | |
| 326 // No lock needed. | |
| 327 CHECK(pending_write_); | |
| 328 pending_write_ = false; | |
| 329 return; | |
| 330 } | |
| 331 | |
| 332 { | |
| 333 base::AutoLock locker(owner_->write_lock()); | |
| 334 CHECK(pending_write_); | |
| 335 pending_write_ = false; | |
| 336 } | |
| 337 | |
| 338 if (error == ERROR_SUCCESS) { | |
| 339 owner_->OnWriteCompleted(IO_SUCCEEDED, 0, bytes_written); | |
| 340 } else if (error == ERROR_BROKEN_PIPE) { | |
| 341 owner_->OnWriteCompleted(IO_FAILED_SHUTDOWN, 0, 0); | |
| 342 } else { | |
| 343 LOG(WARNING) << "WriteFile: " << logging::SystemErrorCodeToString(error); | |
| 344 owner_->OnWriteCompleted(IO_FAILED_UNKNOWN, 0, 0); | |
| 345 } | |
| 346 } | |
| 347 | |
| 348 RawChannelWin::RawChannelWin(embedder::ScopedPlatformHandle handle) | |
| 349 : handle_(handle.Pass()), | |
| 350 io_handler_(nullptr), | |
| 351 skip_completion_port_on_success_( | |
| 352 g_vista_or_higher_functions.Get().is_vista_or_higher()) { | |
| 353 DCHECK(handle_.is_valid()); | |
| 354 } | |
| 355 | |
| 356 RawChannelWin::~RawChannelWin() { | |
| 357 DCHECK(!io_handler_); | |
| 358 } | |
| 359 | |
| 360 size_t RawChannelWin::GetSerializedPlatformHandleSize() const { | |
| 361 // TODO(vtl): Implement. | |
| 362 return 0; | |
| 363 } | |
| 364 | |
| 365 RawChannel::IOResult RawChannelWin::Read(size_t* bytes_read) { | |
| 366 DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io()); | |
| 367 DCHECK(io_handler_); | |
| 368 DCHECK(!io_handler_->pending_read()); | |
| 369 | |
| 370 char* buffer = nullptr; | |
| 371 size_t bytes_to_read = 0; | |
| 372 read_buffer()->GetBuffer(&buffer, &bytes_to_read); | |
| 373 | |
| 374 BOOL result = | |
| 375 ReadFile(io_handler_->handle(), buffer, static_cast<DWORD>(bytes_to_read), | |
| 376 nullptr, &io_handler_->read_context()->overlapped); | |
| 377 if (!result) { | |
| 378 DWORD error = GetLastError(); | |
| 379 if (error == ERROR_BROKEN_PIPE) | |
| 380 return IO_FAILED_SHUTDOWN; | |
| 381 if (error != ERROR_IO_PENDING) { | |
| 382 LOG(WARNING) << "ReadFile: " << logging::SystemErrorCodeToString(error); | |
| 383 return IO_FAILED_UNKNOWN; | |
| 384 } | |
| 385 } | |
| 386 | |
| 387 if (result && skip_completion_port_on_success_) { | |
| 388 DWORD bytes_read_dword = 0; | |
| 389 BOOL get_size_result = GetOverlappedResult( | |
| 390 io_handler_->handle(), &io_handler_->read_context()->overlapped, | |
| 391 &bytes_read_dword, FALSE); | |
| 392 DPCHECK(get_size_result); | |
| 393 *bytes_read = bytes_read_dword; | |
| 394 return IO_SUCCEEDED; | |
| 395 } | |
| 396 | |
| 397 // If the read is pending or the read has succeeded but we don't skip | |
| 398 // completion port on success, instruct |io_handler_| to wait for the | |
| 399 // completion packet. | |
| 400 // | |
| 401 // TODO(yzshen): It seems there isn't document saying that all error cases | |
| 402 // (other than ERROR_IO_PENDING) are guaranteed to *not* queue a completion | |
| 403 // packet. If we do get one for errors, |RawChannelIOHandler::OnIOCompleted()| | |
| 404 // will crash so we will learn about it. | |
| 405 | |
| 406 io_handler_->OnPendingReadStarted(); | |
| 407 return IO_PENDING; | |
| 408 } | |
| 409 | |
| 410 RawChannel::IOResult RawChannelWin::ScheduleRead() { | |
| 411 DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io()); | |
| 412 DCHECK(io_handler_); | |
| 413 DCHECK(!io_handler_->pending_read()); | |
| 414 | |
| 415 size_t bytes_read = 0; | |
| 416 IOResult io_result = Read(&bytes_read); | |
| 417 if (io_result == IO_SUCCEEDED) { | |
| 418 DCHECK(skip_completion_port_on_success_); | |
| 419 | |
| 420 // We have finished reading successfully. Queue a notification manually. | |
| 421 io_handler_->OnPendingReadStarted(); | |
| 422 // |io_handler_| won't go away before the task is run, so it is safe to use | |
| 423 // |base::Unretained()|. | |
| 424 message_loop_for_io()->PostTask( | |
| 425 FROM_HERE, base::Bind(&RawChannelIOHandler::OnIOCompleted, | |
| 426 base::Unretained(io_handler_), | |
| 427 base::Unretained(io_handler_->read_context()), | |
| 428 static_cast<DWORD>(bytes_read), ERROR_SUCCESS)); | |
| 429 return IO_PENDING; | |
| 430 } | |
| 431 | |
| 432 return io_result; | |
| 433 } | |
| 434 | |
| 435 embedder::ScopedPlatformHandleVectorPtr RawChannelWin::GetReadPlatformHandles( | |
| 436 size_t num_platform_handles, | |
| 437 const void* platform_handle_table) { | |
| 438 // TODO(vtl): Implement. | |
| 439 NOTIMPLEMENTED(); | |
| 440 return embedder::ScopedPlatformHandleVectorPtr(); | |
| 441 } | |
| 442 | |
| 443 RawChannel::IOResult RawChannelWin::WriteNoLock( | |
| 444 size_t* platform_handles_written, | |
| 445 size_t* bytes_written) { | |
| 446 write_lock().AssertAcquired(); | |
| 447 | |
| 448 DCHECK(io_handler_); | |
| 449 DCHECK(!io_handler_->pending_write_no_lock()); | |
| 450 | |
| 451 if (write_buffer_no_lock()->HavePlatformHandlesToSend()) { | |
| 452 // TODO(vtl): Implement. | |
| 453 NOTIMPLEMENTED(); | |
| 454 } | |
| 455 | |
| 456 std::vector<WriteBuffer::Buffer> buffers; | |
| 457 write_buffer_no_lock()->GetBuffers(&buffers); | |
| 458 DCHECK(!buffers.empty()); | |
| 459 | |
| 460 // TODO(yzshen): Handle multi-segment writes more efficiently. | |
| 461 DWORD bytes_written_dword = 0; | |
| 462 BOOL result = | |
| 463 WriteFile(io_handler_->handle(), buffers[0].addr, | |
| 464 static_cast<DWORD>(buffers[0].size), &bytes_written_dword, | |
| 465 &io_handler_->write_context_no_lock()->overlapped); | |
| 466 if (!result) { | |
| 467 DWORD error = GetLastError(); | |
| 468 if (error == ERROR_BROKEN_PIPE) | |
| 469 return IO_FAILED_SHUTDOWN; | |
| 470 if (error != ERROR_IO_PENDING) { | |
| 471 LOG(WARNING) << "WriteFile: " << logging::SystemErrorCodeToString(error); | |
| 472 return IO_FAILED_UNKNOWN; | |
| 473 } | |
| 474 } | |
| 475 | |
| 476 if (result && skip_completion_port_on_success_) { | |
| 477 *platform_handles_written = 0; | |
| 478 *bytes_written = bytes_written_dword; | |
| 479 return IO_SUCCEEDED; | |
| 480 } | |
| 481 | |
| 482 // If the write is pending or the write has succeeded but we don't skip | |
| 483 // completion port on success, instruct |io_handler_| to wait for the | |
| 484 // completion packet. | |
| 485 // | |
| 486 // TODO(yzshen): it seems there isn't document saying that all error cases | |
| 487 // (other than ERROR_IO_PENDING) are guaranteed to *not* queue a completion | |
| 488 // packet. If we do get one for errors, |RawChannelIOHandler::OnIOCompleted()| | |
| 489 // will crash so we will learn about it. | |
| 490 | |
| 491 io_handler_->OnPendingWriteStartedNoLock(); | |
| 492 return IO_PENDING; | |
| 493 } | |
| 494 | |
| 495 RawChannel::IOResult RawChannelWin::ScheduleWriteNoLock() { | |
| 496 write_lock().AssertAcquired(); | |
| 497 | |
| 498 DCHECK(io_handler_); | |
| 499 DCHECK(!io_handler_->pending_write_no_lock()); | |
| 500 | |
| 501 // TODO(vtl): Do something with |platform_handles_written|. | |
| 502 size_t platform_handles_written = 0; | |
| 503 size_t bytes_written = 0; | |
| 504 IOResult io_result = WriteNoLock(&platform_handles_written, &bytes_written); | |
| 505 if (io_result == IO_SUCCEEDED) { | |
| 506 DCHECK(skip_completion_port_on_success_); | |
| 507 | |
| 508 // We have finished writing successfully. Queue a notification manually. | |
| 509 io_handler_->OnPendingWriteStartedNoLock(); | |
| 510 // |io_handler_| won't go away before that task is run, so it is safe to use | |
| 511 // |base::Unretained()|. | |
| 512 message_loop_for_io()->PostTask( | |
| 513 FROM_HERE, | |
| 514 base::Bind(&RawChannelIOHandler::OnIOCompleted, | |
| 515 base::Unretained(io_handler_), | |
| 516 base::Unretained(io_handler_->write_context_no_lock()), | |
| 517 static_cast<DWORD>(bytes_written), ERROR_SUCCESS)); | |
| 518 return IO_PENDING; | |
| 519 } | |
| 520 | |
| 521 return io_result; | |
| 522 } | |
| 523 | |
| 524 void RawChannelWin::OnInit() { | |
| 525 DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io()); | |
| 526 | |
| 527 DCHECK(handle_.is_valid()); | |
| 528 if (skip_completion_port_on_success_) { | |
| 529 // I don't know how this can fail (unless |handle_| is bad, in which case | |
| 530 // it's a bug in our code). | |
| 531 CHECK(g_vista_or_higher_functions.Get().SetFileCompletionNotificationModes( | |
| 532 handle_.get().handle, FILE_SKIP_COMPLETION_PORT_ON_SUCCESS)); | |
| 533 } | |
| 534 | |
| 535 DCHECK(!io_handler_); | |
| 536 io_handler_ = new RawChannelIOHandler(this, handle_.Pass()); | |
| 537 } | |
| 538 | |
| 539 void RawChannelWin::OnShutdownNoLock(scoped_ptr<ReadBuffer> read_buffer, | |
| 540 scoped_ptr<WriteBuffer> write_buffer) { | |
| 541 DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io()); | |
| 542 DCHECK(io_handler_); | |
| 543 | |
| 544 write_lock().AssertAcquired(); | |
| 545 | |
| 546 if (io_handler_->pending_read() || io_handler_->pending_write_no_lock()) { | |
| 547 // |io_handler_| will be alive until pending read/write (if any) completes. | |
| 548 // Call |CancelIoEx()| or |CancelIo()| so that resources can be freed up as | |
| 549 // soon as possible. | |
| 550 // Note: |CancelIo()| only cancels read/write requests started from this | |
| 551 // thread. | |
| 552 if (g_vista_or_higher_functions.Get().is_vista_or_higher()) { | |
| 553 g_vista_or_higher_functions.Get().CancelIoEx(io_handler_->handle(), | |
| 554 nullptr); | |
| 555 } else { | |
| 556 CancelIo(io_handler_->handle()); | |
| 557 } | |
| 558 } | |
| 559 | |
| 560 io_handler_->DetachFromOwnerNoLock(read_buffer.Pass(), write_buffer.Pass()); | |
| 561 io_handler_ = nullptr; | |
| 562 } | |
| 563 | |
| 564 } // namespace | |
| 565 | |
| 566 // ----------------------------------------------------------------------------- | |
| 567 | |
| 568 // Static factory method declared in raw_channel.h. | |
| 569 // static | |
| 570 scoped_ptr<RawChannel> RawChannel::Create( | |
| 571 embedder::ScopedPlatformHandle handle) { | |
| 572 return make_scoped_ptr(new RawChannelWin(handle.Pass())); | |
| 573 } | |
| 574 | |
| 575 } // namespace system | |
| 576 } // namespace mojo | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 814543006:
Move //mojo/{public, edk} underneath //third_party (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master