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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/dispatcher.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "mojo/edk/system/configuration.h" | |
| 9 #include "mojo/edk/system/message_pipe_dispatcher.h" | |
| 10 #include "mojo/edk/system/platform_handle_dispatcher.h" | |
| 11 #include "mojo/edk/system/shared_buffer_dispatcher.h" | |
| 12 | |
| 13 namespace mojo { | |
| 14 namespace system { | |
| 15 | |
| 16 namespace test { | |
| 17 | |
| 18 // TODO(vtl): Maybe this should be defined in a test-only file instead. | |
| 19 DispatcherTransport DispatcherTryStartTransport(Dispatcher* dispatcher) { | |
| 20 return Dispatcher::HandleTableAccess::TryStartTransport(dispatcher); | |
| 21 } | |
| 22 | |
| 23 } // namespace test | |
| 24 | |
| 25 // Dispatcher ------------------------------------------------------------------ | |
| 26 | |
| 27 // static | |
| 28 DispatcherTransport Dispatcher::HandleTableAccess::TryStartTransport( | |
| 29 Dispatcher* dispatcher) { | |
| 30 DCHECK(dispatcher); | |
| 31 | |
| 32 if (!dispatcher->lock_.Try()) | |
| 33 return DispatcherTransport(); | |
| 34 | |
| 35 // We shouldn't race with things that close dispatchers, since closing can | |
| 36 // only take place either under |handle_table_lock_| or when the handle is | |
| 37 // marked as busy. | |
| 38 DCHECK(!dispatcher->is_closed_); | |
| 39 | |
| 40 return DispatcherTransport(dispatcher); | |
| 41 } | |
| 42 | |
| 43 // static | |
| 44 void Dispatcher::TransportDataAccess::StartSerialize( | |
| 45 Dispatcher* dispatcher, | |
| 46 Channel* channel, | |
| 47 size_t* max_size, | |
| 48 size_t* max_platform_handles) { | |
| 49 DCHECK(dispatcher); | |
| 50 dispatcher->StartSerialize(channel, max_size, max_platform_handles); | |
| 51 } | |
| 52 | |
| 53 // static | |
| 54 bool Dispatcher::TransportDataAccess::EndSerializeAndClose( | |
| 55 Dispatcher* dispatcher, | |
| 56 Channel* channel, | |
| 57 void* destination, | |
| 58 size_t* actual_size, | |
| 59 embedder::PlatformHandleVector* platform_handles) { | |
| 60 DCHECK(dispatcher); | |
| 61 return dispatcher->EndSerializeAndClose(channel, destination, actual_size, | |
| 62 platform_handles); | |
| 63 } | |
| 64 | |
| 65 // static | |
| 66 scoped_refptr<Dispatcher> Dispatcher::TransportDataAccess::Deserialize( | |
| 67 Channel* channel, | |
| 68 int32_t type, | |
| 69 const void* source, | |
| 70 size_t size, | |
| 71 embedder::PlatformHandleVector* platform_handles) { | |
| 72 switch (static_cast<int32_t>(type)) { | |
| 73 case kTypeUnknown: | |
| 74 DVLOG(2) << "Deserializing invalid handle"; | |
| 75 return nullptr; | |
| 76 case kTypeMessagePipe: | |
| 77 return scoped_refptr<Dispatcher>( | |
| 78 MessagePipeDispatcher::Deserialize(channel, source, size)); | |
| 79 case kTypeDataPipeProducer: | |
| 80 case kTypeDataPipeConsumer: | |
| 81 // TODO(vtl): Implement. | |
| 82 LOG(WARNING) << "Deserialization of dispatcher type " << type | |
| 83 << " not supported"; | |
| 84 return nullptr; | |
| 85 case kTypeSharedBuffer: | |
| 86 return scoped_refptr<Dispatcher>(SharedBufferDispatcher::Deserialize( | |
| 87 channel, source, size, platform_handles)); | |
| 88 case kTypePlatformHandle: | |
| 89 return scoped_refptr<Dispatcher>(PlatformHandleDispatcher::Deserialize( | |
| 90 channel, source, size, platform_handles)); | |
| 91 } | |
| 92 LOG(WARNING) << "Unknown dispatcher type " << type; | |
| 93 return nullptr; | |
| 94 } | |
| 95 | |
| 96 MojoResult Dispatcher::Close() { | |
| 97 base::AutoLock locker(lock_); | |
| 98 if (is_closed_) | |
| 99 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 100 | |
| 101 CloseNoLock(); | |
| 102 return MOJO_RESULT_OK; | |
| 103 } | |
| 104 | |
| 105 MojoResult Dispatcher::WriteMessage( | |
| 106 UserPointer<const void> bytes, | |
| 107 uint32_t num_bytes, | |
| 108 std::vector<DispatcherTransport>* transports, | |
| 109 MojoWriteMessageFlags flags) { | |
| 110 DCHECK(!transports || | |
| 111 (transports->size() > 0 && | |
| 112 transports->size() < GetConfiguration().max_message_num_handles)); | |
| 113 | |
| 114 base::AutoLock locker(lock_); | |
| 115 if (is_closed_) | |
| 116 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 117 | |
| 118 return WriteMessageImplNoLock(bytes, num_bytes, transports, flags); | |
| 119 } | |
| 120 | |
| 121 MojoResult Dispatcher::ReadMessage(UserPointer<void> bytes, | |
| 122 UserPointer<uint32_t> num_bytes, | |
| 123 DispatcherVector* dispatchers, | |
| 124 uint32_t* num_dispatchers, | |
| 125 MojoReadMessageFlags flags) { | |
| 126 DCHECK(!num_dispatchers || *num_dispatchers == 0 || | |
| 127 (dispatchers && dispatchers->empty())); | |
| 128 | |
| 129 base::AutoLock locker(lock_); | |
| 130 if (is_closed_) | |
| 131 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 132 | |
| 133 return ReadMessageImplNoLock(bytes, num_bytes, dispatchers, num_dispatchers, | |
| 134 flags); | |
| 135 } | |
| 136 | |
| 137 MojoResult Dispatcher::WriteData(UserPointer<const void> elements, | |
| 138 UserPointer<uint32_t> num_bytes, | |
| 139 MojoWriteDataFlags flags) { | |
| 140 base::AutoLock locker(lock_); | |
| 141 if (is_closed_) | |
| 142 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 143 | |
| 144 return WriteDataImplNoLock(elements, num_bytes, flags); | |
| 145 } | |
| 146 | |
| 147 MojoResult Dispatcher::BeginWriteData(UserPointer<void*> buffer, | |
| 148 UserPointer<uint32_t> buffer_num_bytes, | |
| 149 MojoWriteDataFlags flags) { | |
| 150 base::AutoLock locker(lock_); | |
| 151 if (is_closed_) | |
| 152 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 153 | |
| 154 return BeginWriteDataImplNoLock(buffer, buffer_num_bytes, flags); | |
| 155 } | |
| 156 | |
| 157 MojoResult Dispatcher::EndWriteData(uint32_t num_bytes_written) { | |
| 158 base::AutoLock locker(lock_); | |
| 159 if (is_closed_) | |
| 160 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 161 | |
| 162 return EndWriteDataImplNoLock(num_bytes_written); | |
| 163 } | |
| 164 | |
| 165 MojoResult Dispatcher::ReadData(UserPointer<void> elements, | |
| 166 UserPointer<uint32_t> num_bytes, | |
| 167 MojoReadDataFlags flags) { | |
| 168 base::AutoLock locker(lock_); | |
| 169 if (is_closed_) | |
| 170 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 171 | |
| 172 return ReadDataImplNoLock(elements, num_bytes, flags); | |
| 173 } | |
| 174 | |
| 175 MojoResult Dispatcher::BeginReadData(UserPointer<const void*> buffer, | |
| 176 UserPointer<uint32_t> buffer_num_bytes, | |
| 177 MojoReadDataFlags flags) { | |
| 178 base::AutoLock locker(lock_); | |
| 179 if (is_closed_) | |
| 180 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 181 | |
| 182 return BeginReadDataImplNoLock(buffer, buffer_num_bytes, flags); | |
| 183 } | |
| 184 | |
| 185 MojoResult Dispatcher::EndReadData(uint32_t num_bytes_read) { | |
| 186 base::AutoLock locker(lock_); | |
| 187 if (is_closed_) | |
| 188 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 189 | |
| 190 return EndReadDataImplNoLock(num_bytes_read); | |
| 191 } | |
| 192 | |
| 193 MojoResult Dispatcher::DuplicateBufferHandle( | |
| 194 UserPointer<const MojoDuplicateBufferHandleOptions> options, | |
| 195 scoped_refptr<Dispatcher>* new_dispatcher) { | |
| 196 base::AutoLock locker(lock_); | |
| 197 if (is_closed_) | |
| 198 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 199 | |
| 200 return DuplicateBufferHandleImplNoLock(options, new_dispatcher); | |
| 201 } | |
| 202 | |
| 203 MojoResult Dispatcher::MapBuffer( | |
| 204 uint64_t offset, | |
| 205 uint64_t num_bytes, | |
| 206 MojoMapBufferFlags flags, | |
| 207 scoped_ptr<embedder::PlatformSharedBufferMapping>* mapping) { | |
| 208 base::AutoLock locker(lock_); | |
| 209 if (is_closed_) | |
| 210 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 211 | |
| 212 return MapBufferImplNoLock(offset, num_bytes, flags, mapping); | |
| 213 } | |
| 214 | |
| 215 HandleSignalsState Dispatcher::GetHandleSignalsState() const { | |
| 216 base::AutoLock locker(lock_); | |
| 217 if (is_closed_) | |
| 218 return HandleSignalsState(); | |
| 219 | |
| 220 return GetHandleSignalsStateImplNoLock(); | |
| 221 } | |
| 222 | |
| 223 MojoResult Dispatcher::AddAwakable(Awakable* awakable, | |
| 224 MojoHandleSignals signals, | |
| 225 uint32_t context, | |
| 226 HandleSignalsState* signals_state) { | |
| 227 base::AutoLock locker(lock_); | |
| 228 if (is_closed_) { | |
| 229 if (signals_state) | |
| 230 *signals_state = HandleSignalsState(); | |
| 231 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 232 } | |
| 233 | |
| 234 return AddAwakableImplNoLock(awakable, signals, context, signals_state); | |
| 235 } | |
| 236 | |
| 237 void Dispatcher::RemoveAwakable(Awakable* awakable, | |
| 238 HandleSignalsState* handle_signals_state) { | |
| 239 base::AutoLock locker(lock_); | |
| 240 if (is_closed_) { | |
| 241 if (handle_signals_state) | |
| 242 *handle_signals_state = HandleSignalsState(); | |
| 243 return; | |
| 244 } | |
| 245 | |
| 246 RemoveAwakableImplNoLock(awakable, handle_signals_state); | |
| 247 } | |
| 248 | |
| 249 Dispatcher::Dispatcher() : is_closed_(false) { | |
| 250 } | |
| 251 | |
| 252 Dispatcher::~Dispatcher() { | |
| 253 // Make sure that |Close()| was called. | |
| 254 DCHECK(is_closed_); | |
| 255 } | |
| 256 | |
| 257 void Dispatcher::CancelAllAwakablesNoLock() { | |
| 258 lock_.AssertAcquired(); | |
| 259 DCHECK(is_closed_); | |
| 260 // By default, waiting isn't supported. Only dispatchers that can be waited on | |
| 261 // will do something nontrivial. | |
| 262 } | |
| 263 | |
| 264 void Dispatcher::CloseImplNoLock() { | |
| 265 lock_.AssertAcquired(); | |
| 266 DCHECK(is_closed_); | |
| 267 // This may not need to do anything. Dispatchers should override this to do | |
| 268 // any actual close-time cleanup necessary. | |
| 269 } | |
| 270 | |
| 271 MojoResult Dispatcher::WriteMessageImplNoLock( | |
| 272 UserPointer<const void> /*bytes*/, | |
| 273 uint32_t /*num_bytes*/, | |
| 274 std::vector<DispatcherTransport>* /*transports*/, | |
| 275 MojoWriteMessageFlags /*flags*/) { | |
| 276 lock_.AssertAcquired(); | |
| 277 DCHECK(!is_closed_); | |
| 278 // By default, not supported. Only needed for message pipe dispatchers. | |
| 279 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 280 } | |
| 281 | |
| 282 MojoResult Dispatcher::ReadMessageImplNoLock( | |
| 283 UserPointer<void> /*bytes*/, | |
| 284 UserPointer<uint32_t> /*num_bytes*/, | |
| 285 DispatcherVector* /*dispatchers*/, | |
| 286 uint32_t* /*num_dispatchers*/, | |
| 287 MojoReadMessageFlags /*flags*/) { | |
| 288 lock_.AssertAcquired(); | |
| 289 DCHECK(!is_closed_); | |
| 290 // By default, not supported. Only needed for message pipe dispatchers. | |
| 291 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 292 } | |
| 293 | |
| 294 MojoResult Dispatcher::WriteDataImplNoLock(UserPointer<const void> /*elements*/, | |
| 295 UserPointer<uint32_t> /*num_bytes*/, | |
| 296 MojoWriteDataFlags /*flags*/) { | |
| 297 lock_.AssertAcquired(); | |
| 298 DCHECK(!is_closed_); | |
| 299 // By default, not supported. Only needed for data pipe dispatchers. | |
| 300 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 301 } | |
| 302 | |
| 303 MojoResult Dispatcher::BeginWriteDataImplNoLock( | |
| 304 UserPointer<void*> /*buffer*/, | |
| 305 UserPointer<uint32_t> /*buffer_num_bytes*/, | |
| 306 MojoWriteDataFlags /*flags*/) { | |
| 307 lock_.AssertAcquired(); | |
| 308 DCHECK(!is_closed_); | |
| 309 // By default, not supported. Only needed for data pipe dispatchers. | |
| 310 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 311 } | |
| 312 | |
| 313 MojoResult Dispatcher::EndWriteDataImplNoLock(uint32_t /*num_bytes_written*/) { | |
| 314 lock_.AssertAcquired(); | |
| 315 DCHECK(!is_closed_); | |
| 316 // By default, not supported. Only needed for data pipe dispatchers. | |
| 317 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 318 } | |
| 319 | |
| 320 MojoResult Dispatcher::ReadDataImplNoLock(UserPointer<void> /*elements*/, | |
| 321 UserPointer<uint32_t> /*num_bytes*/, | |
| 322 MojoReadDataFlags /*flags*/) { | |
| 323 lock_.AssertAcquired(); | |
| 324 DCHECK(!is_closed_); | |
| 325 // By default, not supported. Only needed for data pipe dispatchers. | |
| 326 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 327 } | |
| 328 | |
| 329 MojoResult Dispatcher::BeginReadDataImplNoLock( | |
| 330 UserPointer<const void*> /*buffer*/, | |
| 331 UserPointer<uint32_t> /*buffer_num_bytes*/, | |
| 332 MojoReadDataFlags /*flags*/) { | |
| 333 lock_.AssertAcquired(); | |
| 334 DCHECK(!is_closed_); | |
| 335 // By default, not supported. Only needed for data pipe dispatchers. | |
| 336 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 337 } | |
| 338 | |
| 339 MojoResult Dispatcher::EndReadDataImplNoLock(uint32_t /*num_bytes_read*/) { | |
| 340 lock_.AssertAcquired(); | |
| 341 DCHECK(!is_closed_); | |
| 342 // By default, not supported. Only needed for data pipe dispatchers. | |
| 343 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 344 } | |
| 345 | |
| 346 MojoResult Dispatcher::DuplicateBufferHandleImplNoLock( | |
| 347 UserPointer<const MojoDuplicateBufferHandleOptions> /*options*/, | |
| 348 scoped_refptr<Dispatcher>* /*new_dispatcher*/) { | |
| 349 lock_.AssertAcquired(); | |
| 350 DCHECK(!is_closed_); | |
| 351 // By default, not supported. Only needed for buffer dispatchers. | |
| 352 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 353 } | |
| 354 | |
| 355 MojoResult Dispatcher::MapBufferImplNoLock( | |
| 356 uint64_t /*offset*/, | |
| 357 uint64_t /*num_bytes*/, | |
| 358 MojoMapBufferFlags /*flags*/, | |
| 359 scoped_ptr<embedder::PlatformSharedBufferMapping>* /*mapping*/) { | |
| 360 lock_.AssertAcquired(); | |
| 361 DCHECK(!is_closed_); | |
| 362 // By default, not supported. Only needed for buffer dispatchers. | |
| 363 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 364 } | |
| 365 | |
| 366 HandleSignalsState Dispatcher::GetHandleSignalsStateImplNoLock() const { | |
| 367 lock_.AssertAcquired(); | |
| 368 DCHECK(!is_closed_); | |
| 369 // By default, waiting isn't supported. Only dispatchers that can be waited on | |
| 370 // will do something nontrivial. | |
| 371 return HandleSignalsState(); | |
| 372 } | |
| 373 | |
| 374 MojoResult Dispatcher::AddAwakableImplNoLock( | |
| 375 Awakable* /*awakable*/, | |
| 376 MojoHandleSignals /*signals*/, | |
| 377 uint32_t /*context*/, | |
| 378 HandleSignalsState* signals_state) { | |
| 379 lock_.AssertAcquired(); | |
| 380 DCHECK(!is_closed_); | |
| 381 // By default, waiting isn't supported. Only dispatchers that can be waited on | |
| 382 // will do something nontrivial. | |
| 383 if (signals_state) | |
| 384 *signals_state = HandleSignalsState(); | |
| 385 return MOJO_RESULT_FAILED_PRECONDITION; | |
| 386 } | |
| 387 | |
| 388 void Dispatcher::RemoveAwakableImplNoLock(Awakable* /*awakable*/, | |
| 389 HandleSignalsState* signals_state) { | |
| 390 lock_.AssertAcquired(); | |
| 391 DCHECK(!is_closed_); | |
| 392 // By default, waiting isn't supported. Only dispatchers that can be waited on | |
| 393 // will do something nontrivial. | |
| 394 if (signals_state) | |
| 395 *signals_state = HandleSignalsState(); | |
| 396 } | |
| 397 | |
| 398 void Dispatcher::StartSerializeImplNoLock(Channel* /*channel*/, | |
| 399 size_t* max_size, | |
| 400 size_t* max_platform_handles) { | |
| 401 DCHECK(HasOneRef()); // Only one ref => no need to take the lock. | |
| 402 DCHECK(!is_closed_); | |
| 403 *max_size = 0; | |
| 404 *max_platform_handles = 0; | |
| 405 } | |
| 406 | |
| 407 bool Dispatcher::EndSerializeAndCloseImplNoLock( | |
| 408 Channel* /*channel*/, | |
| 409 void* /*destination*/, | |
| 410 size_t* /*actual_size*/, | |
| 411 embedder::PlatformHandleVector* /*platform_handles*/) { | |
| 412 DCHECK(HasOneRef()); // Only one ref => no need to take the lock. | |
| 413 DCHECK(is_closed_); | |
| 414 // By default, serializing isn't supported, so just close. | |
| 415 CloseImplNoLock(); | |
| 416 return false; | |
| 417 } | |
| 418 | |
| 419 bool Dispatcher::IsBusyNoLock() const { | |
| 420 lock_.AssertAcquired(); | |
| 421 DCHECK(!is_closed_); | |
| 422 // Most dispatchers support only "atomic" operations, so they are never busy | |
| 423 // (in this sense). | |
| 424 return false; | |
| 425 } | |
| 426 | |
| 427 void Dispatcher::CloseNoLock() { | |
| 428 lock_.AssertAcquired(); | |
| 429 DCHECK(!is_closed_); | |
| 430 | |
| 431 is_closed_ = true; | |
| 432 CancelAllAwakablesNoLock(); | |
| 433 CloseImplNoLock(); | |
| 434 } | |
| 435 | |
| 436 scoped_refptr<Dispatcher> | |
| 437 Dispatcher::CreateEquivalentDispatcherAndCloseNoLock() { | |
| 438 lock_.AssertAcquired(); | |
| 439 DCHECK(!is_closed_); | |
| 440 | |
| 441 is_closed_ = true; | |
| 442 CancelAllAwakablesNoLock(); | |
| 443 return CreateEquivalentDispatcherAndCloseImplNoLock(); | |
| 444 } | |
| 445 | |
| 446 void Dispatcher::StartSerialize(Channel* channel, | |
| 447 size_t* max_size, | |
| 448 size_t* max_platform_handles) { | |
| 449 DCHECK(channel); | |
| 450 DCHECK(max_size); | |
| 451 DCHECK(max_platform_handles); | |
| 452 DCHECK(HasOneRef()); // Only one ref => no need to take the lock. | |
| 453 DCHECK(!is_closed_); | |
| 454 StartSerializeImplNoLock(channel, max_size, max_platform_handles); | |
| 455 } | |
| 456 | |
| 457 bool Dispatcher::EndSerializeAndClose( | |
| 458 Channel* channel, | |
| 459 void* destination, | |
| 460 size_t* actual_size, | |
| 461 embedder::PlatformHandleVector* platform_handles) { | |
| 462 DCHECK(channel); | |
| 463 DCHECK(actual_size); | |
| 464 DCHECK(HasOneRef()); // Only one ref => no need to take the lock. | |
| 465 DCHECK(!is_closed_); | |
| 466 | |
| 467 // Like other |...Close()| methods, we mark ourselves as closed before calling | |
| 468 // the impl. But there's no need to cancel waiters: we shouldn't have any (and | |
| 469 // shouldn't be in |Core|'s handle table. | |
| 470 is_closed_ = true; | |
| 471 | |
| 472 #if !defined(NDEBUG) | |
| 473 // See the comment above |EndSerializeAndCloseImplNoLock()|. In brief: Locking | |
| 474 // isn't actually needed, but we need to satisfy assertions (which we don't | |
| 475 // want to remove or weaken). | |
| 476 base::AutoLock locker(lock_); | |
| 477 #endif | |
| 478 | |
| 479 return EndSerializeAndCloseImplNoLock(channel, destination, actual_size, | |
| 480 platform_handles); | |
| 481 } | |
| 482 | |
| 483 // DispatcherTransport --------------------------------------------------------- | |
| 484 | |
| 485 void DispatcherTransport::End() { | |
| 486 DCHECK(dispatcher_); | |
| 487 dispatcher_->lock_.Release(); | |
| 488 dispatcher_ = nullptr; | |
| 489 } | |
| 490 | |
| 491 } // namespace system | |
| 492 } // namespace mojo | |
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Chromium Code Reviews
Issue 814543006:
Move //mojo/{public, edk} underneath //third_party (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master