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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/core.h" | |
| 6 | |
| 7 #include <vector> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "base/time/time.h" | |
| 11 #include "mojo/embedder/platform_shared_buffer.h" | |
| 12 #include "mojo/embedder/platform_support.h" | |
| 13 #include "mojo/public/c/system/macros.h" | |
| 14 #include "mojo/system/constants.h" | |
| 15 #include "mojo/system/data_pipe.h" | |
| 16 #include "mojo/system/data_pipe_consumer_dispatcher.h" | |
| 17 #include "mojo/system/data_pipe_producer_dispatcher.h" | |
| 18 #include "mojo/system/dispatcher.h" | |
| 19 #include "mojo/system/handle_signals_state.h" | |
| 20 #include "mojo/system/local_data_pipe.h" | |
| 21 #include "mojo/system/memory.h" | |
| 22 #include "mojo/system/message_pipe.h" | |
| 23 #include "mojo/system/message_pipe_dispatcher.h" | |
| 24 #include "mojo/system/shared_buffer_dispatcher.h" | |
| 25 #include "mojo/system/waiter.h" | |
| 26 | |
| 27 namespace mojo { | |
| 28 namespace system { | |
| 29 | |
| 30 // Implementation notes | |
| 31 // | |
| 32 // Mojo primitives are implemented by the singleton |Core| object. Most calls | |
| 33 // are for a "primary" handle (the first argument). |Core::GetDispatcher()| is | |
| 34 // used to look up a |Dispatcher| object for a given handle. That object | |
| 35 // implements most primitives for that object. The wait primitives are not | |
| 36 // attached to objects and are implemented by |Core| itself. | |
| 37 // | |
| 38 // Some objects have multiple handles associated to them, e.g., message pipes | |
| 39 // (which have two). In such a case, there is still a |Dispatcher| (e.g., | |
| 40 // |MessagePipeDispatcher|) for each handle, with each handle having a strong | |
| 41 // reference to the common "secondary" object (e.g., |MessagePipe|). This | |
| 42 // secondary object does NOT have any references to the |Dispatcher|s (even if | |
| 43 // it did, it wouldn't be able to do anything with them due to lock order | |
| 44 // requirements -- see below). | |
| 45 // | |
| 46 // Waiting is implemented by having the thread that wants to wait call the | |
| 47 // |Dispatcher|s for the handles that it wants to wait on with a |Waiter| | |
| 48 // object; this |Waiter| object may be created on the stack of that thread or be | |
| 49 // kept in thread local storage for that thread (TODO(vtl): future improvement). | |
| 50 // The |Dispatcher| then adds the |Waiter| to a |WaiterList| that's either owned | |
| 51 // by that |Dispatcher| (see |SimpleDispatcher|) or by a secondary object (e.g., | |
| 52 // |MessagePipe|). To signal/wake a |Waiter|, the object in question -- either a | |
| 53 // |SimpleDispatcher| or a secondary object -- talks to its |WaiterList|. | |
| 54 | |
| 55 // Thread-safety notes | |
| 56 // | |
| 57 // Mojo primitives calls are thread-safe. We achieve this with relatively | |
| 58 // fine-grained locking. There is a global handle table lock. This lock should | |
| 59 // be held as briefly as possible (TODO(vtl): a future improvement would be to | |
| 60 // switch it to a reader-writer lock). Each |Dispatcher| object then has a lock | |
| 61 // (which subclasses can use to protect their data). | |
| 62 // | |
| 63 // The lock ordering is as follows: | |
| 64 // 1. global handle table lock, global mapping table lock | |
| 65 // 2. |Dispatcher| locks | |
| 66 // 3. secondary object locks | |
| 67 // ... | |
| 68 // INF. |Waiter| locks | |
| 69 // | |
| 70 // Notes: | |
| 71 // - While holding a |Dispatcher| lock, you may not unconditionally attempt | |
| 72 // to take another |Dispatcher| lock. (This has consequences on the | |
| 73 // concurrency semantics of |MojoWriteMessage()| when passing handles.) | |
| 74 // Doing so would lead to deadlock. | |
| 75 // - Locks at the "INF" level may not have any locks taken while they are | |
| 76 // held. | |
| 77 | |
| 78 // TODO(vtl): This should take a |scoped_ptr<PlatformSupport>| as a parameter. | |
| 79 Core::Core(scoped_ptr<embedder::PlatformSupport> platform_support) | |
| 80 : platform_support_(platform_support.Pass()) { | |
| 81 } | |
| 82 | |
| 83 Core::~Core() { | |
| 84 } | |
| 85 | |
| 86 MojoHandle Core::AddDispatcher(const scoped_refptr<Dispatcher>& dispatcher) { | |
| 87 base::AutoLock locker(handle_table_lock_); | |
| 88 return handle_table_.AddDispatcher(dispatcher); | |
| 89 } | |
| 90 | |
| 91 scoped_refptr<Dispatcher> Core::GetDispatcher(MojoHandle handle) { | |
| 92 if (handle == MOJO_HANDLE_INVALID) | |
| 93 return nullptr; | |
| 94 | |
| 95 base::AutoLock locker(handle_table_lock_); | |
| 96 return handle_table_.GetDispatcher(handle); | |
| 97 } | |
| 98 | |
| 99 MojoTimeTicks Core::GetTimeTicksNow() { | |
| 100 return base::TimeTicks::Now().ToInternalValue(); | |
| 101 } | |
| 102 | |
| 103 MojoResult Core::Close(MojoHandle handle) { | |
| 104 if (handle == MOJO_HANDLE_INVALID) | |
| 105 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 106 | |
| 107 scoped_refptr<Dispatcher> dispatcher; | |
| 108 { | |
| 109 base::AutoLock locker(handle_table_lock_); | |
| 110 MojoResult result = | |
| 111 handle_table_.GetAndRemoveDispatcher(handle, &dispatcher); | |
| 112 if (result != MOJO_RESULT_OK) | |
| 113 return result; | |
| 114 } | |
| 115 | |
| 116 // The dispatcher doesn't have a say in being closed, but gets notified of it. | |
| 117 // Note: This is done outside of |handle_table_lock_|. As a result, there's a | |
| 118 // race condition that the dispatcher must handle; see the comment in | |
| 119 // |Dispatcher| in dispatcher.h. | |
| 120 return dispatcher->Close(); | |
| 121 } | |
| 122 | |
| 123 MojoResult Core::Wait(MojoHandle handle, | |
| 124 MojoHandleSignals signals, | |
| 125 MojoDeadline deadline, | |
| 126 UserPointer<MojoHandleSignalsState> signals_state) { | |
| 127 uint32_t unused = static_cast<uint32_t>(-1); | |
| 128 HandleSignalsState hss; | |
| 129 MojoResult rv = WaitManyInternal(&handle, | |
| 130 &signals, | |
| 131 1, | |
| 132 deadline, | |
| 133 &unused, | |
| 134 signals_state.IsNull() ? nullptr : &hss); | |
| 135 if (rv != MOJO_RESULT_INVALID_ARGUMENT && !signals_state.IsNull()) | |
| 136 signals_state.Put(hss); | |
| 137 return rv; | |
| 138 } | |
| 139 | |
| 140 MojoResult Core::WaitMany(UserPointer<const MojoHandle> handles, | |
| 141 UserPointer<const MojoHandleSignals> signals, | |
| 142 uint32_t num_handles, | |
| 143 MojoDeadline deadline, | |
| 144 UserPointer<uint32_t> result_index, | |
| 145 UserPointer<MojoHandleSignalsState> signals_states) { | |
| 146 if (num_handles < 1) | |
| 147 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 148 if (num_handles > kMaxWaitManyNumHandles) | |
| 149 return MOJO_RESULT_RESOURCE_EXHAUSTED; | |
| 150 | |
| 151 UserPointer<const MojoHandle>::Reader handles_reader(handles, num_handles); | |
| 152 UserPointer<const MojoHandleSignals>::Reader signals_reader(signals, | |
| 153 num_handles); | |
| 154 uint32_t index = static_cast<uint32_t>(-1); | |
| 155 MojoResult rv; | |
| 156 if (signals_states.IsNull()) { | |
| 157 rv = WaitManyInternal(handles_reader.GetPointer(), | |
| 158 signals_reader.GetPointer(), | |
| 159 num_handles, | |
| 160 deadline, | |
| 161 &index, | |
| 162 nullptr); | |
| 163 } else { | |
| 164 UserPointer<MojoHandleSignalsState>::Writer signals_states_writer( | |
| 165 signals_states, num_handles); | |
| 166 // Note: The |reinterpret_cast| is safe, since |HandleSignalsState| is a | |
| 167 // subclass of |MojoHandleSignalsState| that doesn't add any data members. | |
| 168 rv = WaitManyInternal(handles_reader.GetPointer(), | |
| 169 signals_reader.GetPointer(), | |
| 170 num_handles, | |
| 171 deadline, | |
| 172 &index, | |
| 173 reinterpret_cast<HandleSignalsState*>( | |
| 174 signals_states_writer.GetPointer())); | |
| 175 if (rv != MOJO_RESULT_INVALID_ARGUMENT) | |
| 176 signals_states_writer.Commit(); | |
| 177 } | |
| 178 if (index != static_cast<uint32_t>(-1) && !result_index.IsNull()) | |
| 179 result_index.Put(index); | |
| 180 return rv; | |
| 181 } | |
| 182 | |
| 183 MojoResult Core::CreateMessagePipe( | |
| 184 UserPointer<const MojoCreateMessagePipeOptions> options, | |
| 185 UserPointer<MojoHandle> message_pipe_handle0, | |
| 186 UserPointer<MojoHandle> message_pipe_handle1) { | |
| 187 MojoCreateMessagePipeOptions validated_options = {}; | |
| 188 MojoResult result = | |
| 189 MessagePipeDispatcher::ValidateCreateOptions(options, &validated_options); | |
| 190 if (result != MOJO_RESULT_OK) | |
| 191 return result; | |
| 192 | |
| 193 scoped_refptr<MessagePipeDispatcher> dispatcher0( | |
| 194 new MessagePipeDispatcher(validated_options)); | |
| 195 scoped_refptr<MessagePipeDispatcher> dispatcher1( | |
| 196 new MessagePipeDispatcher(validated_options)); | |
| 197 | |
| 198 std::pair<MojoHandle, MojoHandle> handle_pair; | |
| 199 { | |
| 200 base::AutoLock locker(handle_table_lock_); | |
| 201 handle_pair = handle_table_.AddDispatcherPair(dispatcher0, dispatcher1); | |
| 202 } | |
| 203 if (handle_pair.first == MOJO_HANDLE_INVALID) { | |
| 204 DCHECK_EQ(handle_pair.second, MOJO_HANDLE_INVALID); | |
| 205 LOG(ERROR) << "Handle table full"; | |
| 206 dispatcher0->Close(); | |
| 207 dispatcher1->Close(); | |
| 208 return MOJO_RESULT_RESOURCE_EXHAUSTED; | |
| 209 } | |
| 210 | |
| 211 scoped_refptr<MessagePipe> message_pipe(MessagePipe::CreateLocalLocal()); | |
| 212 dispatcher0->Init(message_pipe, 0); | |
| 213 dispatcher1->Init(message_pipe, 1); | |
| 214 | |
| 215 message_pipe_handle0.Put(handle_pair.first); | |
| 216 message_pipe_handle1.Put(handle_pair.second); | |
| 217 return MOJO_RESULT_OK; | |
| 218 } | |
| 219 | |
| 220 // Implementation note: To properly cancel waiters and avoid other races, this | |
| 221 // does not transfer dispatchers from one handle to another, even when sending a | |
| 222 // message in-process. Instead, it must transfer the "contents" of the | |
| 223 // dispatcher to a new dispatcher, and then close the old dispatcher. If this | |
| 224 // isn't done, in the in-process case, calls on the old handle may complete | |
| 225 // after the the message has been received and a new handle created (and | |
| 226 // possibly even after calls have been made on the new handle). | |
| 227 MojoResult Core::WriteMessage(MojoHandle message_pipe_handle, | |
| 228 UserPointer<const void> bytes, | |
| 229 uint32_t num_bytes, | |
| 230 UserPointer<const MojoHandle> handles, | |
| 231 uint32_t num_handles, | |
| 232 MojoWriteMessageFlags flags) { | |
| 233 scoped_refptr<Dispatcher> dispatcher(GetDispatcher(message_pipe_handle)); | |
| 234 if (!dispatcher.get()) | |
| 235 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 236 | |
| 237 // Easy case: not sending any handles. | |
| 238 if (num_handles == 0) | |
| 239 return dispatcher->WriteMessage(bytes, num_bytes, nullptr, flags); | |
| 240 | |
| 241 // We have to handle |handles| here, since we have to mark them busy in the | |
| 242 // global handle table. We can't delegate this to the dispatcher, since the | |
| 243 // handle table lock must be acquired before the dispatcher lock. | |
| 244 // | |
| 245 // (This leads to an oddity: |handles|/|num_handles| are always verified for | |
| 246 // validity, even for dispatchers that don't support |WriteMessage()| and will | |
| 247 // simply return failure unconditionally. It also breaks the usual | |
| 248 // left-to-right verification order of arguments.) | |
| 249 if (num_handles > kMaxMessageNumHandles) | |
| 250 return MOJO_RESULT_RESOURCE_EXHAUSTED; | |
| 251 | |
| 252 UserPointer<const MojoHandle>::Reader handles_reader(handles, num_handles); | |
| 253 | |
| 254 // We'll need to hold on to the dispatchers so that we can pass them on to | |
| 255 // |WriteMessage()| and also so that we can unlock their locks afterwards | |
| 256 // without accessing the handle table. These can be dumb pointers, since their | |
| 257 // entries in the handle table won't get removed (since they'll be marked as | |
| 258 // busy). | |
| 259 std::vector<DispatcherTransport> transports(num_handles); | |
| 260 | |
| 261 // When we pass handles, we have to try to take all their dispatchers' locks | |
| 262 // and mark the handles as busy. If the call succeeds, we then remove the | |
| 263 // handles from the handle table. | |
| 264 { | |
| 265 base::AutoLock locker(handle_table_lock_); | |
| 266 MojoResult result = | |
| 267 handle_table_.MarkBusyAndStartTransport(message_pipe_handle, | |
| 268 handles_reader.GetPointer(), | |
| 269 num_handles, | |
| 270 &transports); | |
| 271 if (result != MOJO_RESULT_OK) | |
| 272 return result; | |
| 273 } | |
| 274 | |
| 275 MojoResult rv = | |
| 276 dispatcher->WriteMessage(bytes, num_bytes, &transports, flags); | |
| 277 | |
| 278 // We need to release the dispatcher locks before we take the handle table | |
| 279 // lock. | |
| 280 for (uint32_t i = 0; i < num_handles; i++) | |
| 281 transports[i].End(); | |
| 282 | |
| 283 { | |
| 284 base::AutoLock locker(handle_table_lock_); | |
| 285 if (rv == MOJO_RESULT_OK) { | |
| 286 handle_table_.RemoveBusyHandles(handles_reader.GetPointer(), num_handles); | |
| 287 } else { | |
| 288 handle_table_.RestoreBusyHandles(handles_reader.GetPointer(), | |
| 289 num_handles); | |
| 290 } | |
| 291 } | |
| 292 | |
| 293 return rv; | |
| 294 } | |
| 295 | |
| 296 MojoResult Core::ReadMessage(MojoHandle message_pipe_handle, | |
| 297 UserPointer<void> bytes, | |
| 298 UserPointer<uint32_t> num_bytes, | |
| 299 UserPointer<MojoHandle> handles, | |
| 300 UserPointer<uint32_t> num_handles, | |
| 301 MojoReadMessageFlags flags) { | |
| 302 scoped_refptr<Dispatcher> dispatcher(GetDispatcher(message_pipe_handle)); | |
| 303 if (!dispatcher.get()) | |
| 304 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 305 | |
| 306 uint32_t num_handles_value = num_handles.IsNull() ? 0 : num_handles.Get(); | |
| 307 | |
| 308 MojoResult rv; | |
| 309 if (num_handles_value == 0) { | |
| 310 // Easy case: won't receive any handles. | |
| 311 rv = dispatcher->ReadMessage( | |
| 312 bytes, num_bytes, nullptr, &num_handles_value, flags); | |
| 313 } else { | |
| 314 DispatcherVector dispatchers; | |
| 315 rv = dispatcher->ReadMessage( | |
| 316 bytes, num_bytes, &dispatchers, &num_handles_value, flags); | |
| 317 if (!dispatchers.empty()) { | |
| 318 DCHECK_EQ(rv, MOJO_RESULT_OK); | |
| 319 DCHECK(!num_handles.IsNull()); | |
| 320 DCHECK_LE(dispatchers.size(), static_cast<size_t>(num_handles_value)); | |
| 321 | |
| 322 bool success; | |
| 323 UserPointer<MojoHandle>::Writer handles_writer(handles, | |
| 324 dispatchers.size()); | |
| 325 { | |
| 326 base::AutoLock locker(handle_table_lock_); | |
| 327 success = handle_table_.AddDispatcherVector( | |
| 328 dispatchers, handles_writer.GetPointer()); | |
| 329 } | |
| 330 if (success) { | |
| 331 handles_writer.Commit(); | |
| 332 } else { | |
| 333 LOG(ERROR) << "Received message with " << dispatchers.size() | |
| 334 << " handles, but handle table full"; | |
| 335 // Close dispatchers (outside the lock). | |
| 336 for (size_t i = 0; i < dispatchers.size(); i++) { | |
| 337 if (dispatchers[i].get()) | |
| 338 dispatchers[i]->Close(); | |
| 339 } | |
| 340 if (rv == MOJO_RESULT_OK) | |
| 341 rv = MOJO_RESULT_RESOURCE_EXHAUSTED; | |
| 342 } | |
| 343 } | |
| 344 } | |
| 345 | |
| 346 if (!num_handles.IsNull()) | |
| 347 num_handles.Put(num_handles_value); | |
| 348 return rv; | |
| 349 } | |
| 350 | |
| 351 MojoResult Core::CreateDataPipe( | |
| 352 UserPointer<const MojoCreateDataPipeOptions> options, | |
| 353 UserPointer<MojoHandle> data_pipe_producer_handle, | |
| 354 UserPointer<MojoHandle> data_pipe_consumer_handle) { | |
| 355 MojoCreateDataPipeOptions validated_options = {}; | |
| 356 MojoResult result = | |
| 357 DataPipe::ValidateCreateOptions(options, &validated_options); | |
| 358 if (result != MOJO_RESULT_OK) | |
| 359 return result; | |
| 360 | |
| 361 scoped_refptr<DataPipeProducerDispatcher> producer_dispatcher( | |
| 362 new DataPipeProducerDispatcher()); | |
| 363 scoped_refptr<DataPipeConsumerDispatcher> consumer_dispatcher( | |
| 364 new DataPipeConsumerDispatcher()); | |
| 365 | |
| 366 std::pair<MojoHandle, MojoHandle> handle_pair; | |
| 367 { | |
| 368 base::AutoLock locker(handle_table_lock_); | |
| 369 handle_pair = handle_table_.AddDispatcherPair(producer_dispatcher, | |
| 370 consumer_dispatcher); | |
| 371 } | |
| 372 if (handle_pair.first == MOJO_HANDLE_INVALID) { | |
| 373 DCHECK_EQ(handle_pair.second, MOJO_HANDLE_INVALID); | |
| 374 LOG(ERROR) << "Handle table full"; | |
| 375 producer_dispatcher->Close(); | |
| 376 consumer_dispatcher->Close(); | |
| 377 return MOJO_RESULT_RESOURCE_EXHAUSTED; | |
| 378 } | |
| 379 DCHECK_NE(handle_pair.second, MOJO_HANDLE_INVALID); | |
| 380 | |
| 381 scoped_refptr<DataPipe> data_pipe(new LocalDataPipe(validated_options)); | |
| 382 producer_dispatcher->Init(data_pipe); | |
| 383 consumer_dispatcher->Init(data_pipe); | |
| 384 | |
| 385 data_pipe_producer_handle.Put(handle_pair.first); | |
| 386 data_pipe_consumer_handle.Put(handle_pair.second); | |
| 387 return MOJO_RESULT_OK; | |
| 388 } | |
| 389 | |
| 390 MojoResult Core::WriteData(MojoHandle data_pipe_producer_handle, | |
| 391 UserPointer<const void> elements, | |
| 392 UserPointer<uint32_t> num_bytes, | |
| 393 MojoWriteDataFlags flags) { | |
| 394 scoped_refptr<Dispatcher> dispatcher( | |
| 395 GetDispatcher(data_pipe_producer_handle)); | |
| 396 if (!dispatcher.get()) | |
| 397 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 398 | |
| 399 return dispatcher->WriteData(elements, num_bytes, flags); | |
| 400 } | |
| 401 | |
| 402 MojoResult Core::BeginWriteData(MojoHandle data_pipe_producer_handle, | |
| 403 UserPointer<void*> buffer, | |
| 404 UserPointer<uint32_t> buffer_num_bytes, | |
| 405 MojoWriteDataFlags flags) { | |
| 406 scoped_refptr<Dispatcher> dispatcher( | |
| 407 GetDispatcher(data_pipe_producer_handle)); | |
| 408 if (!dispatcher.get()) | |
| 409 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 410 | |
| 411 return dispatcher->BeginWriteData(buffer, buffer_num_bytes, flags); | |
| 412 } | |
| 413 | |
| 414 MojoResult Core::EndWriteData(MojoHandle data_pipe_producer_handle, | |
| 415 uint32_t num_bytes_written) { | |
| 416 scoped_refptr<Dispatcher> dispatcher( | |
| 417 GetDispatcher(data_pipe_producer_handle)); | |
| 418 if (!dispatcher.get()) | |
| 419 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 420 | |
| 421 return dispatcher->EndWriteData(num_bytes_written); | |
| 422 } | |
| 423 | |
| 424 MojoResult Core::ReadData(MojoHandle data_pipe_consumer_handle, | |
| 425 UserPointer<void> elements, | |
| 426 UserPointer<uint32_t> num_bytes, | |
| 427 MojoReadDataFlags flags) { | |
| 428 scoped_refptr<Dispatcher> dispatcher( | |
| 429 GetDispatcher(data_pipe_consumer_handle)); | |
| 430 if (!dispatcher.get()) | |
| 431 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 432 | |
| 433 return dispatcher->ReadData(elements, num_bytes, flags); | |
| 434 } | |
| 435 | |
| 436 MojoResult Core::BeginReadData(MojoHandle data_pipe_consumer_handle, | |
| 437 UserPointer<const void*> buffer, | |
| 438 UserPointer<uint32_t> buffer_num_bytes, | |
| 439 MojoReadDataFlags flags) { | |
| 440 scoped_refptr<Dispatcher> dispatcher( | |
| 441 GetDispatcher(data_pipe_consumer_handle)); | |
| 442 if (!dispatcher.get()) | |
| 443 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 444 | |
| 445 return dispatcher->BeginReadData(buffer, buffer_num_bytes, flags); | |
| 446 } | |
| 447 | |
| 448 MojoResult Core::EndReadData(MojoHandle data_pipe_consumer_handle, | |
| 449 uint32_t num_bytes_read) { | |
| 450 scoped_refptr<Dispatcher> dispatcher( | |
| 451 GetDispatcher(data_pipe_consumer_handle)); | |
| 452 if (!dispatcher.get()) | |
| 453 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 454 | |
| 455 return dispatcher->EndReadData(num_bytes_read); | |
| 456 } | |
| 457 | |
| 458 MojoResult Core::CreateSharedBuffer( | |
| 459 UserPointer<const MojoCreateSharedBufferOptions> options, | |
| 460 uint64_t num_bytes, | |
| 461 UserPointer<MojoHandle> shared_buffer_handle) { | |
| 462 MojoCreateSharedBufferOptions validated_options = {}; | |
| 463 MojoResult result = SharedBufferDispatcher::ValidateCreateOptions( | |
| 464 options, &validated_options); | |
| 465 if (result != MOJO_RESULT_OK) | |
| 466 return result; | |
| 467 | |
| 468 scoped_refptr<SharedBufferDispatcher> dispatcher; | |
| 469 result = SharedBufferDispatcher::Create( | |
| 470 platform_support(), validated_options, num_bytes, &dispatcher); | |
| 471 if (result != MOJO_RESULT_OK) { | |
| 472 DCHECK(!dispatcher.get()); | |
| 473 return result; | |
| 474 } | |
| 475 | |
| 476 MojoHandle h = AddDispatcher(dispatcher); | |
| 477 if (h == MOJO_HANDLE_INVALID) { | |
| 478 LOG(ERROR) << "Handle table full"; | |
| 479 dispatcher->Close(); | |
| 480 return MOJO_RESULT_RESOURCE_EXHAUSTED; | |
| 481 } | |
| 482 | |
| 483 shared_buffer_handle.Put(h); | |
| 484 return MOJO_RESULT_OK; | |
| 485 } | |
| 486 | |
| 487 MojoResult Core::DuplicateBufferHandle( | |
| 488 MojoHandle buffer_handle, | |
| 489 UserPointer<const MojoDuplicateBufferHandleOptions> options, | |
| 490 UserPointer<MojoHandle> new_buffer_handle) { | |
| 491 scoped_refptr<Dispatcher> dispatcher(GetDispatcher(buffer_handle)); | |
| 492 if (!dispatcher.get()) | |
| 493 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 494 | |
| 495 // Don't verify |options| here; that's the dispatcher's job. | |
| 496 scoped_refptr<Dispatcher> new_dispatcher; | |
| 497 MojoResult result = | |
| 498 dispatcher->DuplicateBufferHandle(options, &new_dispatcher); | |
| 499 if (result != MOJO_RESULT_OK) | |
| 500 return result; | |
| 501 | |
| 502 MojoHandle new_handle = AddDispatcher(new_dispatcher); | |
| 503 if (new_handle == MOJO_HANDLE_INVALID) { | |
| 504 LOG(ERROR) << "Handle table full"; | |
| 505 dispatcher->Close(); | |
| 506 return MOJO_RESULT_RESOURCE_EXHAUSTED; | |
| 507 } | |
| 508 | |
| 509 new_buffer_handle.Put(new_handle); | |
| 510 return MOJO_RESULT_OK; | |
| 511 } | |
| 512 | |
| 513 MojoResult Core::MapBuffer(MojoHandle buffer_handle, | |
| 514 uint64_t offset, | |
| 515 uint64_t num_bytes, | |
| 516 UserPointer<void*> buffer, | |
| 517 MojoMapBufferFlags flags) { | |
| 518 scoped_refptr<Dispatcher> dispatcher(GetDispatcher(buffer_handle)); | |
| 519 if (!dispatcher.get()) | |
| 520 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 521 | |
| 522 scoped_ptr<embedder::PlatformSharedBufferMapping> mapping; | |
| 523 MojoResult result = dispatcher->MapBuffer(offset, num_bytes, flags, &mapping); | |
| 524 if (result != MOJO_RESULT_OK) | |
| 525 return result; | |
| 526 | |
| 527 DCHECK(mapping); | |
| 528 void* address = mapping->GetBase(); | |
| 529 { | |
| 530 base::AutoLock locker(mapping_table_lock_); | |
| 531 result = mapping_table_.AddMapping(mapping.Pass()); | |
| 532 } | |
| 533 if (result != MOJO_RESULT_OK) | |
| 534 return result; | |
| 535 | |
| 536 buffer.Put(address); | |
| 537 return MOJO_RESULT_OK; | |
| 538 } | |
| 539 | |
| 540 MojoResult Core::UnmapBuffer(UserPointer<void> buffer) { | |
| 541 base::AutoLock locker(mapping_table_lock_); | |
| 542 return mapping_table_.RemoveMapping(buffer.GetPointerValue()); | |
| 543 } | |
| 544 | |
| 545 // Note: We allow |handles| to repeat the same handle multiple times, since | |
| 546 // different flags may be specified. | |
| 547 // TODO(vtl): This incurs a performance cost in |RemoveWaiter()|. Analyze this | |
| 548 // more carefully and address it if necessary. | |
| 549 MojoResult Core::WaitManyInternal(const MojoHandle* handles, | |
| 550 const MojoHandleSignals* signals, | |
| 551 uint32_t num_handles, | |
| 552 MojoDeadline deadline, | |
| 553 uint32_t* result_index, | |
| 554 HandleSignalsState* signals_states) { | |
| 555 DCHECK_GT(num_handles, 0u); | |
| 556 DCHECK_EQ(*result_index, static_cast<uint32_t>(-1)); | |
| 557 | |
| 558 DispatcherVector dispatchers; | |
| 559 dispatchers.reserve(num_handles); | |
| 560 for (uint32_t i = 0; i < num_handles; i++) { | |
| 561 scoped_refptr<Dispatcher> dispatcher = GetDispatcher(handles[i]); | |
| 562 if (!dispatcher.get()) { | |
| 563 *result_index = i; | |
| 564 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 565 } | |
| 566 dispatchers.push_back(dispatcher); | |
| 567 } | |
| 568 | |
| 569 // TODO(vtl): Should make the waiter live (permanently) in TLS. | |
| 570 Waiter waiter; | |
| 571 waiter.Init(); | |
| 572 | |
| 573 uint32_t i; | |
| 574 MojoResult rv = MOJO_RESULT_OK; | |
| 575 for (i = 0; i < num_handles; i++) { | |
| 576 rv = dispatchers[i]->AddWaiter( | |
| 577 &waiter, signals[i], i, signals_states ? &signals_states[i] : nullptr); | |
| 578 if (rv != MOJO_RESULT_OK) { | |
| 579 *result_index = i; | |
| 580 break; | |
| 581 } | |
| 582 } | |
| 583 uint32_t num_added = i; | |
| 584 | |
| 585 if (rv == MOJO_RESULT_ALREADY_EXISTS) | |
| 586 rv = MOJO_RESULT_OK; // The i-th one is already "triggered". | |
| 587 else if (rv == MOJO_RESULT_OK) | |
| 588 rv = waiter.Wait(deadline, result_index); | |
| 589 | |
| 590 // Make sure no other dispatchers try to wake |waiter| for the current | |
| 591 // |Wait()|/|WaitMany()| call. (Only after doing this can |waiter| be | |
| 592 // destroyed, but this would still be required if the waiter were in TLS.) | |
| 593 for (i = 0; i < num_added; i++) { | |
| 594 dispatchers[i]->RemoveWaiter(&waiter, | |
| 595 signals_states ? &signals_states[i] : nullptr); | |
| 596 } | |
| 597 if (signals_states) { | |
| 598 for (; i < num_handles; i++) | |
| 599 signals_states[i] = dispatchers[i]->GetHandleSignalsState(); | |
| 600 } | |
| 601 | |
| 602 return rv; | |
| 603 } | |
| 604 | |
| 605 } // namespace system | |
| 606 } // namespace mojo | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 621153003:
Move mojo edk into mojo/edk (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master