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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/system/dispatcher.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "mojo/system/constants.h" | |
| 9 #include "mojo/system/message_pipe_dispatcher.h" | |
| 10 #include "mojo/system/platform_handle_dispatcher.h" | |
| 11 #include "mojo/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( | |
| 62 channel, destination, actual_size, 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 scoped_refptr<Dispatcher>(); | |
| 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 scoped_refptr<Dispatcher>(); | |
| 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 scoped_refptr<Dispatcher>(); | |
| 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 || (transports->size() > 0 && | |
| 111 transports->size() < kMaxMessageNumHandles)); | |
| 112 | |
| 113 base::AutoLock locker(lock_); | |
| 114 if (is_closed_) | |
| 115 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 116 | |
| 117 return WriteMessageImplNoLock(bytes, num_bytes, transports, flags); | |
| 118 } | |
| 119 | |
| 120 MojoResult Dispatcher::ReadMessage(UserPointer<void> bytes, | |
| 121 UserPointer<uint32_t> num_bytes, | |
| 122 DispatcherVector* dispatchers, | |
| 123 uint32_t* num_dispatchers, | |
| 124 MojoReadMessageFlags flags) { | |
| 125 DCHECK(!num_dispatchers || *num_dispatchers == 0 || | |
| 126 (dispatchers && dispatchers->empty())); | |
| 127 | |
| 128 base::AutoLock locker(lock_); | |
| 129 if (is_closed_) | |
| 130 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 131 | |
| 132 return ReadMessageImplNoLock( | |
| 133 bytes, num_bytes, dispatchers, num_dispatchers, flags); | |
| 134 } | |
| 135 | |
| 136 MojoResult Dispatcher::WriteData(UserPointer<const void> elements, | |
| 137 UserPointer<uint32_t> num_bytes, | |
| 138 MojoWriteDataFlags flags) { | |
| 139 base::AutoLock locker(lock_); | |
| 140 if (is_closed_) | |
| 141 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 142 | |
| 143 return WriteDataImplNoLock(elements, num_bytes, flags); | |
| 144 } | |
| 145 | |
| 146 MojoResult Dispatcher::BeginWriteData(UserPointer<void*> buffer, | |
| 147 UserPointer<uint32_t> buffer_num_bytes, | |
| 148 MojoWriteDataFlags flags) { | |
| 149 base::AutoLock locker(lock_); | |
| 150 if (is_closed_) | |
| 151 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 152 | |
| 153 return BeginWriteDataImplNoLock(buffer, buffer_num_bytes, flags); | |
| 154 } | |
| 155 | |
| 156 MojoResult Dispatcher::EndWriteData(uint32_t num_bytes_written) { | |
| 157 base::AutoLock locker(lock_); | |
| 158 if (is_closed_) | |
| 159 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 160 | |
| 161 return EndWriteDataImplNoLock(num_bytes_written); | |
| 162 } | |
| 163 | |
| 164 MojoResult Dispatcher::ReadData(UserPointer<void> elements, | |
| 165 UserPointer<uint32_t> num_bytes, | |
| 166 MojoReadDataFlags flags) { | |
| 167 base::AutoLock locker(lock_); | |
| 168 if (is_closed_) | |
| 169 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 170 | |
| 171 return ReadDataImplNoLock(elements, num_bytes, flags); | |
| 172 } | |
| 173 | |
| 174 MojoResult Dispatcher::BeginReadData(UserPointer<const void*> buffer, | |
| 175 UserPointer<uint32_t> buffer_num_bytes, | |
| 176 MojoReadDataFlags flags) { | |
| 177 base::AutoLock locker(lock_); | |
| 178 if (is_closed_) | |
| 179 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 180 | |
| 181 return BeginReadDataImplNoLock(buffer, buffer_num_bytes, flags); | |
| 182 } | |
| 183 | |
| 184 MojoResult Dispatcher::EndReadData(uint32_t num_bytes_read) { | |
| 185 base::AutoLock locker(lock_); | |
| 186 if (is_closed_) | |
| 187 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 188 | |
| 189 return EndReadDataImplNoLock(num_bytes_read); | |
| 190 } | |
| 191 | |
| 192 MojoResult Dispatcher::DuplicateBufferHandle( | |
| 193 UserPointer<const MojoDuplicateBufferHandleOptions> options, | |
| 194 scoped_refptr<Dispatcher>* new_dispatcher) { | |
| 195 base::AutoLock locker(lock_); | |
| 196 if (is_closed_) | |
| 197 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 198 | |
| 199 return DuplicateBufferHandleImplNoLock(options, new_dispatcher); | |
| 200 } | |
| 201 | |
| 202 MojoResult Dispatcher::MapBuffer( | |
| 203 uint64_t offset, | |
| 204 uint64_t num_bytes, | |
| 205 MojoMapBufferFlags flags, | |
| 206 scoped_ptr<embedder::PlatformSharedBufferMapping>* mapping) { | |
| 207 base::AutoLock locker(lock_); | |
| 208 if (is_closed_) | |
| 209 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 210 | |
| 211 return MapBufferImplNoLock(offset, num_bytes, flags, mapping); | |
| 212 } | |
| 213 | |
| 214 HandleSignalsState Dispatcher::GetHandleSignalsState() const { | |
| 215 base::AutoLock locker(lock_); | |
| 216 if (is_closed_) | |
| 217 return HandleSignalsState(); | |
| 218 | |
| 219 return GetHandleSignalsStateImplNoLock(); | |
| 220 } | |
| 221 | |
| 222 MojoResult Dispatcher::AddWaiter(Waiter* waiter, | |
| 223 MojoHandleSignals signals, | |
| 224 uint32_t context, | |
| 225 HandleSignalsState* signals_state) { | |
| 226 base::AutoLock locker(lock_); | |
| 227 if (is_closed_) { | |
| 228 if (signals_state) | |
| 229 *signals_state = HandleSignalsState(); | |
| 230 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 231 } | |
| 232 | |
| 233 return AddWaiterImplNoLock(waiter, signals, context, signals_state); | |
| 234 } | |
| 235 | |
| 236 void Dispatcher::RemoveWaiter(Waiter* waiter, | |
| 237 HandleSignalsState* handle_signals_state) { | |
| 238 base::AutoLock locker(lock_); | |
| 239 if (is_closed_) { | |
| 240 if (handle_signals_state) | |
| 241 *handle_signals_state = HandleSignalsState(); | |
| 242 return; | |
| 243 } | |
| 244 RemoveWaiterImplNoLock(waiter, handle_signals_state); | |
| 245 } | |
| 246 | |
| 247 Dispatcher::Dispatcher() : is_closed_(false) { | |
| 248 } | |
| 249 | |
| 250 Dispatcher::~Dispatcher() { | |
| 251 // Make sure that |Close()| was called. | |
| 252 DCHECK(is_closed_); | |
| 253 } | |
| 254 | |
| 255 void Dispatcher::CancelAllWaitersNoLock() { | |
| 256 lock_.AssertAcquired(); | |
| 257 DCHECK(is_closed_); | |
| 258 // By default, waiting isn't supported. Only dispatchers that can be waited on | |
| 259 // will do something nontrivial. | |
| 260 } | |
| 261 | |
| 262 void Dispatcher::CloseImplNoLock() { | |
| 263 lock_.AssertAcquired(); | |
| 264 DCHECK(is_closed_); | |
| 265 // This may not need to do anything. Dispatchers should override this to do | |
| 266 // any actual close-time cleanup necessary. | |
| 267 } | |
| 268 | |
| 269 MojoResult Dispatcher::WriteMessageImplNoLock( | |
| 270 UserPointer<const void> /*bytes*/, | |
| 271 uint32_t /*num_bytes*/, | |
| 272 std::vector<DispatcherTransport>* /*transports*/, | |
| 273 MojoWriteMessageFlags /*flags*/) { | |
| 274 lock_.AssertAcquired(); | |
| 275 DCHECK(!is_closed_); | |
| 276 // By default, not supported. Only needed for message pipe dispatchers. | |
| 277 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 278 } | |
| 279 | |
| 280 MojoResult Dispatcher::ReadMessageImplNoLock( | |
| 281 UserPointer<void> /*bytes*/, | |
| 282 UserPointer<uint32_t> /*num_bytes*/, | |
| 283 DispatcherVector* /*dispatchers*/, | |
| 284 uint32_t* /*num_dispatchers*/, | |
| 285 MojoReadMessageFlags /*flags*/) { | |
| 286 lock_.AssertAcquired(); | |
| 287 DCHECK(!is_closed_); | |
| 288 // By default, not supported. Only needed for message pipe dispatchers. | |
| 289 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 290 } | |
| 291 | |
| 292 MojoResult Dispatcher::WriteDataImplNoLock(UserPointer<const void> /*elements*/, | |
| 293 UserPointer<uint32_t> /*num_bytes*/, | |
| 294 MojoWriteDataFlags /*flags*/) { | |
| 295 lock_.AssertAcquired(); | |
| 296 DCHECK(!is_closed_); | |
| 297 // By default, not supported. Only needed for data pipe dispatchers. | |
| 298 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 299 } | |
| 300 | |
| 301 MojoResult Dispatcher::BeginWriteDataImplNoLock( | |
| 302 UserPointer<void*> /*buffer*/, | |
| 303 UserPointer<uint32_t> /*buffer_num_bytes*/, | |
| 304 MojoWriteDataFlags /*flags*/) { | |
| 305 lock_.AssertAcquired(); | |
| 306 DCHECK(!is_closed_); | |
| 307 // By default, not supported. Only needed for data pipe dispatchers. | |
| 308 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 309 } | |
| 310 | |
| 311 MojoResult Dispatcher::EndWriteDataImplNoLock(uint32_t /*num_bytes_written*/) { | |
| 312 lock_.AssertAcquired(); | |
| 313 DCHECK(!is_closed_); | |
| 314 // By default, not supported. Only needed for data pipe dispatchers. | |
| 315 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 316 } | |
| 317 | |
| 318 MojoResult Dispatcher::ReadDataImplNoLock(UserPointer<void> /*elements*/, | |
| 319 UserPointer<uint32_t> /*num_bytes*/, | |
| 320 MojoReadDataFlags /*flags*/) { | |
| 321 lock_.AssertAcquired(); | |
| 322 DCHECK(!is_closed_); | |
| 323 // By default, not supported. Only needed for data pipe dispatchers. | |
| 324 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 325 } | |
| 326 | |
| 327 MojoResult Dispatcher::BeginReadDataImplNoLock( | |
| 328 UserPointer<const void*> /*buffer*/, | |
| 329 UserPointer<uint32_t> /*buffer_num_bytes*/, | |
| 330 MojoReadDataFlags /*flags*/) { | |
| 331 lock_.AssertAcquired(); | |
| 332 DCHECK(!is_closed_); | |
| 333 // By default, not supported. Only needed for data pipe dispatchers. | |
| 334 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 335 } | |
| 336 | |
| 337 MojoResult Dispatcher::EndReadDataImplNoLock(uint32_t /*num_bytes_read*/) { | |
| 338 lock_.AssertAcquired(); | |
| 339 DCHECK(!is_closed_); | |
| 340 // By default, not supported. Only needed for data pipe dispatchers. | |
| 341 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 342 } | |
| 343 | |
| 344 MojoResult Dispatcher::DuplicateBufferHandleImplNoLock( | |
| 345 UserPointer<const MojoDuplicateBufferHandleOptions> /*options*/, | |
| 346 scoped_refptr<Dispatcher>* /*new_dispatcher*/) { | |
| 347 lock_.AssertAcquired(); | |
| 348 DCHECK(!is_closed_); | |
| 349 // By default, not supported. Only needed for buffer dispatchers. | |
| 350 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 351 } | |
| 352 | |
| 353 MojoResult Dispatcher::MapBufferImplNoLock( | |
| 354 uint64_t /*offset*/, | |
| 355 uint64_t /*num_bytes*/, | |
| 356 MojoMapBufferFlags /*flags*/, | |
| 357 scoped_ptr<embedder::PlatformSharedBufferMapping>* /*mapping*/) { | |
| 358 lock_.AssertAcquired(); | |
| 359 DCHECK(!is_closed_); | |
| 360 // By default, not supported. Only needed for buffer dispatchers. | |
| 361 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 362 } | |
| 363 | |
| 364 HandleSignalsState Dispatcher::GetHandleSignalsStateImplNoLock() const { | |
| 365 lock_.AssertAcquired(); | |
| 366 DCHECK(!is_closed_); | |
| 367 // By default, waiting isn't supported. Only dispatchers that can be waited on | |
| 368 // will do something nontrivial. | |
| 369 return HandleSignalsState(); | |
| 370 } | |
| 371 | |
| 372 MojoResult Dispatcher::AddWaiterImplNoLock(Waiter* /*waiter*/, | |
| 373 MojoHandleSignals /*signals*/, | |
| 374 uint32_t /*context*/, | |
| 375 HandleSignalsState* signals_state) { | |
| 376 lock_.AssertAcquired(); | |
| 377 DCHECK(!is_closed_); | |
| 378 // By default, waiting isn't supported. Only dispatchers that can be waited on | |
| 379 // will do something nontrivial. | |
| 380 if (signals_state) | |
| 381 *signals_state = HandleSignalsState(); | |
| 382 return MOJO_RESULT_FAILED_PRECONDITION; | |
| 383 } | |
| 384 | |
| 385 void Dispatcher::RemoveWaiterImplNoLock(Waiter* /*waiter*/, | |
| 386 HandleSignalsState* signals_state) { | |
| 387 lock_.AssertAcquired(); | |
| 388 DCHECK(!is_closed_); | |
| 389 // By default, waiting isn't supported. Only dispatchers that can be waited on | |
| 390 // will do something nontrivial. | |
| 391 if (signals_state) | |
| 392 *signals_state = HandleSignalsState(); | |
| 393 } | |
| 394 | |
| 395 void Dispatcher::StartSerializeImplNoLock(Channel* /*channel*/, | |
| 396 size_t* max_size, | |
| 397 size_t* max_platform_handles) { | |
| 398 DCHECK(HasOneRef()); // Only one ref => no need to take the lock. | |
| 399 DCHECK(!is_closed_); | |
| 400 *max_size = 0; | |
| 401 *max_platform_handles = 0; | |
| 402 } | |
| 403 | |
| 404 bool Dispatcher::EndSerializeAndCloseImplNoLock( | |
| 405 Channel* /*channel*/, | |
| 406 void* /*destination*/, | |
| 407 size_t* /*actual_size*/, | |
| 408 embedder::PlatformHandleVector* /*platform_handles*/) { | |
| 409 DCHECK(HasOneRef()); // Only one ref => no need to take the lock. | |
| 410 DCHECK(is_closed_); | |
| 411 // By default, serializing isn't supported, so just close. | |
| 412 CloseImplNoLock(); | |
| 413 return false; | |
| 414 } | |
| 415 | |
| 416 bool Dispatcher::IsBusyNoLock() const { | |
| 417 lock_.AssertAcquired(); | |
| 418 DCHECK(!is_closed_); | |
| 419 // Most dispatchers support only "atomic" operations, so they are never busy | |
| 420 // (in this sense). | |
| 421 return false; | |
| 422 } | |
| 423 | |
| 424 void Dispatcher::CloseNoLock() { | |
| 425 lock_.AssertAcquired(); | |
| 426 DCHECK(!is_closed_); | |
| 427 | |
| 428 is_closed_ = true; | |
| 429 CancelAllWaitersNoLock(); | |
| 430 CloseImplNoLock(); | |
| 431 } | |
| 432 | |
| 433 scoped_refptr<Dispatcher> | |
| 434 Dispatcher::CreateEquivalentDispatcherAndCloseNoLock() { | |
| 435 lock_.AssertAcquired(); | |
| 436 DCHECK(!is_closed_); | |
| 437 | |
| 438 is_closed_ = true; | |
| 439 CancelAllWaitersNoLock(); | |
| 440 return CreateEquivalentDispatcherAndCloseImplNoLock(); | |
| 441 } | |
| 442 | |
| 443 void Dispatcher::StartSerialize(Channel* channel, | |
| 444 size_t* max_size, | |
| 445 size_t* max_platform_handles) { | |
| 446 DCHECK(channel); | |
| 447 DCHECK(max_size); | |
| 448 DCHECK(max_platform_handles); | |
| 449 DCHECK(HasOneRef()); // Only one ref => no need to take the lock. | |
| 450 DCHECK(!is_closed_); | |
| 451 StartSerializeImplNoLock(channel, max_size, max_platform_handles); | |
| 452 } | |
| 453 | |
| 454 bool Dispatcher::EndSerializeAndClose( | |
| 455 Channel* channel, | |
| 456 void* destination, | |
| 457 size_t* actual_size, | |
| 458 embedder::PlatformHandleVector* platform_handles) { | |
| 459 DCHECK(channel); | |
| 460 DCHECK(actual_size); | |
| 461 DCHECK(HasOneRef()); // Only one ref => no need to take the lock. | |
| 462 DCHECK(!is_closed_); | |
| 463 | |
| 464 // Like other |...Close()| methods, we mark ourselves as closed before calling | |
| 465 // the impl. But there's no need to cancel waiters: we shouldn't have any (and | |
| 466 // shouldn't be in |Core|'s handle table. | |
| 467 is_closed_ = true; | |
| 468 | |
| 469 #if !defined(NDEBUG) | |
| 470 // See the comment above |EndSerializeAndCloseImplNoLock()|. In brief: Locking | |
| 471 // isn't actually needed, but we need to satisfy assertions (which we don't | |
| 472 // want to remove or weaken). | |
| 473 base::AutoLock locker(lock_); | |
| 474 #endif | |
| 475 | |
| 476 return EndSerializeAndCloseImplNoLock( | |
| 477 channel, destination, actual_size, platform_handles); | |
| 478 } | |
| 479 | |
| 480 // DispatcherTransport --------------------------------------------------------- | |
| 481 | |
| 482 void DispatcherTransport::End() { | |
| 483 DCHECK(dispatcher_); | |
| 484 dispatcher_->lock_.Release(); | |
| 485 dispatcher_ = nullptr; | |
| 486 } | |
| 487 | |
| 488 } // namespace system | |
| 489 } // namespace mojo | |
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Chromium Code Reviews
Issue 621153003:
Move mojo edk into mojo/edk (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master