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| 1 // Copyright 2015 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/result.h> | |
| 6 #include <mojo/system/handle.h> | |
| 7 #include <mojo/system/message_pipe.h> | |
| 8 #include <mojo/system/time.h> | |
| 9 #include <mojo/system/wait.h> | |
| 10 #include <stdio.h> | |
| 11 #include <string.h> | |
| 12 #include <sys/time.h> | |
| 13 | |
| 14 #include <memory> | |
| 15 #include <mutex> | |
| 16 #include <set> | |
| 17 #include <unordered_map> | |
| 18 #include <vector> | |
| 19 | |
| 20 #include "mojo/public/platform/dart/dart_handle_watcher.h" | |
| 21 | |
| 22 #include "dart/runtime/include/dart_api.h" | |
| 23 #include "dart/runtime/include/dart_native_api.h" | |
| 24 | |
| 25 namespace mojo { | |
| 26 namespace dart { | |
| 27 | |
| 28 #define CONTROL_HANDLE_INDEX 0 | |
| 29 | |
| 30 static void PostNull(Dart_Port port) { | |
| 31 if (port == ILLEGAL_PORT) { | |
| 32 return; | |
| 33 } | |
| 34 Dart_CObject message; | |
| 35 message.type = Dart_CObject_kNull; | |
| 36 Dart_PostCObject(port, &message); | |
| 37 } | |
| 38 | |
| 39 static void PostSignal(Dart_Port port, int32_t signalled) { | |
| 40 if (port == ILLEGAL_PORT) { | |
| 41 return; | |
| 42 } | |
| 43 Dart_PostInteger(port, signalled); | |
| 44 } | |
| 45 | |
| 46 // The internal state of the handle watcher thread. | |
| 47 class HandleWatcherThreadState { | |
| 48 public: | |
| 49 HandleWatcherThreadState(MojoHandle control_pipe_consumer_handle); | |
| 50 | |
| 51 ~HandleWatcherThreadState(); | |
| 52 | |
| 53 void Run(); | |
| 54 | |
| 55 private: | |
| 56 struct HandleWatcherTimer { | |
| 57 int64_t deadline; | |
| 58 Dart_Port port; | |
| 59 | |
| 60 // Sort on deadline. | |
| 61 friend bool operator<(const HandleWatcherTimer& l, | |
| 62 const HandleWatcherTimer& r) { | |
| 63 return l.deadline < r.deadline; | |
| 64 } | |
| 65 }; | |
| 66 | |
| 67 void AddHandle(MojoHandle handle, | |
| 68 MojoHandleSignals signals, | |
| 69 Dart_Port port); | |
| 70 | |
| 71 void RemoveHandle(MojoHandle handle); | |
| 72 | |
| 73 void CloseHandle(MojoHandle handle, Dart_Port port, bool pruning = false); | |
| 74 | |
| 75 void UpdateTimer(int64_t deadline, Dart_Port port); | |
| 76 | |
| 77 void Shutdown(); | |
| 78 | |
| 79 void RemoveHandleAtIndex(intptr_t i); | |
| 80 | |
| 81 void ProcessControlMessage(); | |
| 82 | |
| 83 void ProcessTimers(); | |
| 84 | |
| 85 void ProcessWaitManyResults(MojoResult result, uint32_t result_index); | |
| 86 | |
| 87 void PruneClosedHandles(bool signals_state_is_valid); | |
| 88 | |
| 89 void CompleteNextTimer(); | |
| 90 | |
| 91 bool HasTimers(); | |
| 92 | |
| 93 int64_t NextTimerDeadline(); | |
| 94 | |
| 95 int64_t WaitDeadline(); | |
| 96 | |
| 97 bool shutdown_; | |
| 98 | |
| 99 MojoHandle control_pipe_consumer_handle_; | |
| 100 | |
| 101 // All of these vectors are indexed together. | |
| 102 std::vector<MojoHandle> wait_many_handles_; | |
| 103 std::vector<MojoHandleSignals> wait_many_signals_; | |
| 104 std::vector<MojoHandleSignalsState> wait_many_signals_state_; | |
| 105 std::vector<Dart_Port> handle_ports_; | |
| 106 | |
| 107 // Map from MojoHandle -> index into above arrays. | |
| 108 std::unordered_map<MojoHandle, intptr_t> handle_to_index_map_; | |
| 109 | |
| 110 // Set of timers sorted by earliest deadline. | |
| 111 std::set<HandleWatcherTimer> timers_; | |
| 112 | |
| 113 MOJO_DISALLOW_COPY_AND_ASSIGN(HandleWatcherThreadState); | |
| 114 }; | |
| 115 | |
| 116 HandleWatcherThreadState::HandleWatcherThreadState( | |
| 117 MojoHandle control_pipe_consumer_handle) | |
| 118 : shutdown_(false), | |
| 119 control_pipe_consumer_handle_(control_pipe_consumer_handle) { | |
| 120 MOJO_CHECK(control_pipe_consumer_handle_ != MOJO_HANDLE_INVALID); | |
| 121 // Add the control handle. | |
| 122 AddHandle(control_pipe_consumer_handle_, | |
| 123 MOJO_HANDLE_SIGNAL_READABLE, | |
| 124 ILLEGAL_PORT); | |
| 125 } | |
| 126 | |
| 127 HandleWatcherThreadState::~HandleWatcherThreadState() { | |
| 128 if (control_pipe_consumer_handle_ != MOJO_HANDLE_INVALID) { | |
| 129 MojoClose(control_pipe_consumer_handle_); | |
| 130 control_pipe_consumer_handle_ = MOJO_HANDLE_INVALID; | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 void HandleWatcherThreadState::AddHandle(MojoHandle handle, | |
| 135 MojoHandleSignals signals, | |
| 136 Dart_Port port) { | |
| 137 const size_t index = wait_many_handles_.size(); | |
| 138 MojoHandleSignalsState signals_state = | |
| 139 { MOJO_HANDLE_SIGNAL_NONE, MOJO_HANDLE_SIGNAL_NONE}; | |
| 140 | |
| 141 auto it = handle_to_index_map_.find(handle); | |
| 142 if (it != handle_to_index_map_.end()) { | |
| 143 intptr_t index = it->second; | |
| 144 // Sanity check. | |
| 145 MOJO_CHECK(wait_many_handles_[index] == handle); | |
| 146 // We only support 1:1 mapping from handles to ports. | |
| 147 if (handle_ports_[index] != port) { | |
| 148 MOJO_LOG(ERROR) << "(Dart Handle Watcher) " | |
| 149 << "Handle " << handle << " is already bound!"; | |
| 150 PostSignal(port, MOJO_HANDLE_SIGNAL_PEER_CLOSED); | |
| 151 return; | |
| 152 } | |
| 153 // Adjust the signals for this handle. | |
| 154 wait_many_signals_[index] |= signals; | |
| 155 } else { | |
| 156 // New handle. | |
| 157 wait_many_handles_.push_back(handle); | |
| 158 wait_many_signals_.push_back(signals); | |
| 159 wait_many_signals_state_.push_back(signals_state); | |
| 160 handle_ports_.push_back(port); | |
| 161 handle_to_index_map_[handle] = index; | |
| 162 } | |
| 163 | |
| 164 // Sanity check. | |
| 165 MOJO_CHECK(wait_many_handles_.size() == handle_to_index_map_.size()); | |
| 166 } | |
| 167 | |
| 168 void HandleWatcherThreadState::RemoveHandle(MojoHandle handle) { | |
| 169 auto it = handle_to_index_map_.find(handle); | |
| 170 | |
| 171 // Removal of a handle for an incoming event can race with the removal of | |
| 172 // a handle for an unsubscribe() call on the Dart MojoEventSubscription. | |
| 173 // This is not an error, so we ignore attempts to remove a handle that is not | |
| 174 // in the map. | |
| 175 if (it == handle_to_index_map_.end()) { | |
| 176 return; | |
| 177 } | |
| 178 const intptr_t index = it->second; | |
| 179 // We should never be removing the control handle. | |
| 180 MOJO_CHECK(index != CONTROL_HANDLE_INDEX); | |
| 181 RemoveHandleAtIndex(index); | |
| 182 } | |
| 183 | |
| 184 void HandleWatcherThreadState::CloseHandle(MojoHandle handle, | |
| 185 Dart_Port port, | |
| 186 bool pruning) { | |
| 187 MOJO_CHECK(!pruning || (port == ILLEGAL_PORT)); | |
| 188 auto it = handle_to_index_map_.find(handle); | |
| 189 if (it == handle_to_index_map_.end()) { | |
| 190 // An app isolate may request that the handle watcher close a handle that | |
| 191 // has already been pruned. This happens when the app isolate has not yet | |
| 192 // received the PEER_CLOSED event. The app isolate will not close the | |
| 193 // handle, so we must do so here. | |
| 194 MojoClose(handle); | |
| 195 if (port != ILLEGAL_PORT) { | |
| 196 // Notify that close is done. | |
| 197 PostNull(port); | |
| 198 } | |
| 199 return; | |
| 200 } | |
| 201 MojoClose(handle); | |
| 202 if (port != ILLEGAL_PORT) { | |
| 203 // Notify that close is done. | |
| 204 PostNull(port); | |
| 205 } | |
| 206 const intptr_t index = it->second; | |
| 207 MOJO_CHECK(index != CONTROL_HANDLE_INDEX); | |
| 208 if (pruning) { | |
| 209 // If this handle is being pruned, notify the application isolate | |
| 210 // by sending PEER_CLOSED; | |
| 211 PostSignal(handle_ports_[index], MOJO_HANDLE_SIGNAL_PEER_CLOSED); | |
| 212 } | |
| 213 // Remove the handle. | |
| 214 RemoveHandle(handle); | |
| 215 } | |
| 216 | |
| 217 void HandleWatcherThreadState::UpdateTimer(int64_t deadline, Dart_Port port) { | |
| 218 // Scan the timers to see if we have a timer with |port|. | |
| 219 auto it = timers_.begin(); | |
| 220 while (it != timers_.end()) { | |
| 221 if (it->port == port) { | |
| 222 break; | |
| 223 } | |
| 224 it++; | |
| 225 } | |
| 226 | |
| 227 // We found an existing timer with |port|. Remove it. | |
| 228 if (it != timers_.end()) { | |
| 229 timers_.erase(it); | |
| 230 } | |
| 231 | |
| 232 if (deadline < 0) { | |
| 233 // A negative deadline means we should cancel this timer completely. | |
| 234 return; | |
| 235 } | |
| 236 | |
| 237 // Create a new timer with the current deadline. | |
| 238 HandleWatcherTimer timer; | |
| 239 timer.deadline = deadline; | |
| 240 timer.port = port; | |
| 241 | |
| 242 timers_.insert(timer); | |
| 243 } | |
| 244 | |
| 245 void HandleWatcherThreadState::Shutdown() { | |
| 246 // Break out of the loop by setting the shutdown_ to true. | |
| 247 shutdown_ = true; | |
| 248 } | |
| 249 | |
| 250 void HandleWatcherThreadState::RemoveHandleAtIndex(intptr_t index) { | |
| 251 MOJO_CHECK(index != CONTROL_HANDLE_INDEX); | |
| 252 const intptr_t last_index = wait_many_handles_.size() - 1; | |
| 253 | |
| 254 // Remove handle from handle map. | |
| 255 handle_to_index_map_.erase(wait_many_handles_[index]); | |
| 256 | |
| 257 if (index != last_index) { | |
| 258 // We should never be overwriting CONTROL_HANDLE_INDEX. | |
| 259 | |
| 260 MojoHandle handle = wait_many_handles_[last_index]; | |
| 261 | |
| 262 // Replace |index| with |last_index|. | |
| 263 wait_many_handles_[index] = wait_many_handles_[last_index]; | |
| 264 wait_many_signals_[index] = wait_many_signals_[last_index]; | |
| 265 wait_many_signals_state_[index] = wait_many_signals_state_[last_index]; | |
| 266 handle_ports_[index] = handle_ports_[last_index]; | |
| 267 | |
| 268 // Update handle map. | |
| 269 handle_to_index_map_[handle] = index; | |
| 270 } | |
| 271 | |
| 272 wait_many_handles_.pop_back(); | |
| 273 wait_many_signals_.pop_back(); | |
| 274 wait_many_signals_state_.pop_back(); | |
| 275 handle_ports_.pop_back(); | |
| 276 MOJO_CHECK(wait_many_handles_.size() >= 1); | |
| 277 | |
| 278 // Sanity check. | |
| 279 MOJO_CHECK(wait_many_handles_.size() == handle_to_index_map_.size()); | |
| 280 } | |
| 281 | |
| 282 void HandleWatcherThreadState::ProcessControlMessage() { | |
| 283 HandleWatcherCommand command = HandleWatcherCommand::Empty(); | |
| 284 uint32_t num_bytes = sizeof(command); | |
| 285 uint32_t num_handles = 0; | |
| 286 MojoResult res = MojoReadMessage(control_pipe_consumer_handle_, | |
| 287 reinterpret_cast<void*>(&command), | |
| 288 &num_bytes, | |
| 289 nullptr, | |
| 290 &num_handles, | |
| 291 0); | |
| 292 // Sanity check that we received the expected amount of data. | |
| 293 MOJO_CHECK(res == MOJO_RESULT_OK); | |
| 294 MOJO_CHECK(num_bytes == sizeof(command)); | |
| 295 MOJO_CHECK(num_handles == 0); | |
| 296 switch (command.command()) { | |
| 297 case HandleWatcherCommand::kCommandAddHandle: | |
| 298 AddHandle(command.handle(), command.signals(), command.port()); | |
| 299 break; | |
| 300 case HandleWatcherCommand::kCommandRemoveHandle: | |
| 301 RemoveHandle(command.handle()); | |
| 302 break; | |
| 303 case HandleWatcherCommand::kCommandCloseHandle: | |
| 304 CloseHandle(command.handle(), command.port()); | |
| 305 break; | |
| 306 case HandleWatcherCommand::kCommandAddTimer: | |
| 307 UpdateTimer(command.deadline(), command.port()); | |
| 308 break; | |
| 309 case HandleWatcherCommand::kCommandShutdownHandleWatcher: | |
| 310 Shutdown(); | |
| 311 break; | |
| 312 default: | |
| 313 MOJO_CHECK(false); | |
| 314 break; | |
| 315 } | |
| 316 } | |
| 317 | |
| 318 // Dart's Timer class uses MojoCoreNatives.timerMillisecondClock(), which | |
| 319 // calls MojoGetTimeTicksNow() and divides by 1000; | |
| 320 static int64_t GetDartTimeInMillis() { | |
| 321 MojoTimeTicks ticks = MojoGetTimeTicksNow(); | |
| 322 return static_cast<int64_t>(ticks) / 1000; | |
| 323 } | |
| 324 | |
| 325 void HandleWatcherThreadState::ProcessTimers() { | |
| 326 int64_t now = GetDartTimeInMillis(); | |
| 327 while (HasTimers() && now >= NextTimerDeadline()) { | |
| 328 CompleteNextTimer(); | |
| 329 now = GetDartTimeInMillis(); | |
| 330 } | |
| 331 } | |
| 332 | |
| 333 void HandleWatcherThreadState::CompleteNextTimer() { | |
| 334 auto it = timers_.begin(); | |
| 335 MOJO_CHECK(it != timers_.end()); | |
| 336 // Notify that the timer is complete. | |
| 337 PostNull(it->port); | |
| 338 // Remove it from the timer set. | |
| 339 timers_.erase(it); | |
| 340 } | |
| 341 | |
| 342 bool HandleWatcherThreadState::HasTimers() { | |
| 343 return !timers_.empty(); | |
| 344 } | |
| 345 | |
| 346 int64_t HandleWatcherThreadState::NextTimerDeadline() { | |
| 347 auto it = timers_.begin(); | |
| 348 MOJO_CHECK(it != timers_.end()); | |
| 349 return it->deadline; | |
| 350 } | |
| 351 | |
| 352 int64_t HandleWatcherThreadState::WaitDeadline() { | |
| 353 if (!HasTimers()) { | |
| 354 // No pending timers. Wait indefinitely. | |
| 355 return MOJO_DEADLINE_INDEFINITE; | |
| 356 } | |
| 357 int64_t now = GetDartTimeInMillis(); | |
| 358 return (NextTimerDeadline() - now) * 1000; | |
| 359 } | |
| 360 | |
| 361 static bool ShouldCloseHandle(MojoHandle handle) { | |
| 362 if (handle == MOJO_HANDLE_INVALID) { | |
| 363 return false; | |
| 364 } | |
| 365 // Call wait with a deadline of 0. If the result of this is OK or | |
| 366 // DEADLINE_EXCEEDED, the handle is still open. | |
| 367 MojoResult result = MojoWait(handle, MOJO_HANDLE_SIGNAL_ALL, 0, NULL); | |
| 368 return (result != MOJO_RESULT_OK) && | |
| 369 (result != MOJO_RESULT_DEADLINE_EXCEEDED); | |
| 370 } | |
| 371 | |
| 372 void HandleWatcherThreadState::PruneClosedHandles(bool signals_state_is_valid) { | |
| 373 std::vector<MojoHandle> closed_handles; | |
| 374 const intptr_t num_handles = wait_many_handles_.size(); | |
| 375 if (signals_state_is_valid) { | |
| 376 // We can rely on |wait_many_signals_state_| having valid data. | |
| 377 for (intptr_t i = 0; i < num_handles; i++) { | |
| 378 // Check if the handle at index |i| has been closed. | |
| 379 MojoHandleSignals satisfied_signals = | |
| 380 wait_many_signals_state_[i].satisfied_signals; | |
| 381 if ((satisfied_signals & MOJO_HANDLE_SIGNAL_PEER_CLOSED) != 0) { | |
| 382 closed_handles.push_back(wait_many_handles_[i]); | |
| 383 } | |
| 384 } | |
| 385 } else { | |
| 386 // We can't rely on |wait_many_signals_state_| having valid data. So | |
| 387 // we call Wait on each handle and check the status. | |
| 388 for (intptr_t i = 0; i < num_handles; i++) { | |
| 389 MojoHandle handle = wait_many_handles_[i]; | |
| 390 if (ShouldCloseHandle(handle)) { | |
| 391 closed_handles.push_back(handle); | |
| 392 } | |
| 393 } | |
| 394 } | |
| 395 | |
| 396 // Process all closed handles and notify their ports. | |
| 397 for (size_t i = 0; i < closed_handles.size(); i++) { | |
| 398 MojoHandle handle = closed_handles[i]; | |
| 399 CloseHandle(handle, ILLEGAL_PORT, true); | |
| 400 } | |
| 401 } | |
| 402 | |
| 403 void HandleWatcherThreadState::ProcessWaitManyResults(MojoResult result, | |
| 404 uint32_t result_index) { | |
| 405 MOJO_CHECK(result != MOJO_RESULT_DEADLINE_EXCEEDED); | |
| 406 if (result != MOJO_RESULT_OK) { | |
| 407 // The WaitMany call failed. We need to prune closed handles from our | |
| 408 // wait many set and try again. | |
| 409 // | |
| 410 // If the result is an invalid argument |wait_many_signals_state_| is | |
| 411 // meaningless. | |
| 412 PruneClosedHandles(result != MOJO_RESULT_INVALID_ARGUMENT); | |
| 413 return; | |
| 414 } | |
| 415 MOJO_CHECK(result == MOJO_RESULT_OK); | |
| 416 | |
| 417 // Indexes of handles that we are done with. | |
| 418 std::vector<intptr_t> to_remove; | |
| 419 | |
| 420 const intptr_t num_handles = wait_many_handles_.size(); | |
| 421 | |
| 422 // Loop over all handles except for the control handle. | |
| 423 // The order of the looping matters because we call RemoveHandleAtIndex | |
| 424 // and need the handle indexes to start at the highest and decrease. | |
| 425 for (intptr_t i = num_handles - 1; i > 0; i--) { | |
| 426 MojoHandleSignals signals = wait_many_signals_[i]; | |
| 427 MojoHandleSignals satisfied_signals = | |
| 428 wait_many_signals_state_[i].satisfied_signals; | |
| 429 satisfied_signals &= signals; | |
| 430 if (satisfied_signals != 0) { | |
| 431 // Something happened to this handle. | |
| 432 | |
| 433 // Notify the port. | |
| 434 PostSignal(handle_ports_[i], satisfied_signals); | |
| 435 | |
| 436 // Now that we have notified the waiting Dart program, remove this handle | |
| 437 // from the wait many set until we are requested to add it again. | |
| 438 to_remove.push_back(i); | |
| 439 } | |
| 440 } | |
| 441 | |
| 442 // Remove any handles we are finished with. | |
| 443 const intptr_t num_to_remove = to_remove.size(); | |
| 444 for (intptr_t i = 0; i < num_to_remove; i++) { | |
| 445 RemoveHandleAtIndex(to_remove[i]); | |
| 446 } | |
| 447 | |
| 448 // Now check for control messages. | |
| 449 { | |
| 450 MojoHandleSignals signals = wait_many_signals_[CONTROL_HANDLE_INDEX]; | |
| 451 MojoHandleSignals satisfied_signals = | |
| 452 wait_many_signals_state_[CONTROL_HANDLE_INDEX].satisfied_signals; | |
| 453 satisfied_signals &= signals; | |
| 454 if (satisfied_signals != 0) { | |
| 455 // We have a control message. | |
| 456 ProcessControlMessage(); | |
| 457 } | |
| 458 } | |
| 459 } | |
| 460 | |
| 461 void HandleWatcherThreadState::Run() { | |
| 462 while (!shutdown_) { | |
| 463 // Process timers. | |
| 464 ProcessTimers(); | |
| 465 // Wait for the next timer or an event on a handle. | |
| 466 uint32_t result_index = -1; | |
| 467 uint32_t num_handles = wait_many_handles_.size(); | |
| 468 MOJO_CHECK(wait_many_signals_.size() == num_handles); | |
| 469 MojoResult result = MojoWaitMany(wait_many_handles_.data(), | |
| 470 wait_many_signals_.data(), | |
| 471 num_handles, | |
| 472 WaitDeadline(), | |
| 473 &result_index, | |
| 474 wait_many_signals_state_.data()); | |
| 475 | |
| 476 if (result == MOJO_RESULT_DEADLINE_EXCEEDED) { | |
| 477 // Timers are ready. | |
| 478 continue; | |
| 479 } | |
| 480 | |
| 481 // Process wait results. | |
| 482 ProcessWaitManyResults(result, result_index); | |
| 483 } | |
| 484 | |
| 485 // Close our end of the message pipe. | |
| 486 MojoClose(control_pipe_consumer_handle_); | |
| 487 } | |
| 488 | |
| 489 std::unordered_map<MojoHandle, std::thread*> | |
| 490 HandleWatcher::handle_watcher_threads_; | |
| 491 std::mutex HandleWatcher::handle_watcher_threads_mutex_; | |
| 492 | |
| 493 // Create a message pipe for communication and spawns a handle watcher thread. | |
| 494 MojoHandle HandleWatcher::Start() { | |
| 495 MojoCreateMessagePipeOptions options; | |
| 496 options.struct_size = sizeof(MojoCreateMessagePipeOptions); | |
| 497 options.flags = MOJO_CREATE_MESSAGE_PIPE_OPTIONS_FLAG_NONE; | |
| 498 | |
| 499 MojoHandle control_pipe_consumer_handle = MOJO_HANDLE_INVALID; | |
| 500 MojoHandle control_pipe_producer_handle = MOJO_HANDLE_INVALID; | |
| 501 MojoResult res = MojoCreateMessagePipe(&options, | |
| 502 &control_pipe_consumer_handle, | |
| 503 &control_pipe_producer_handle); | |
| 504 if (res != MOJO_RESULT_OK) { | |
| 505 return MOJO_HANDLE_INVALID; | |
| 506 } | |
| 507 | |
| 508 // Spawn thread and pass both ends of the pipe to it. | |
| 509 std::thread* thread = new std::thread( | |
| 510 ThreadMain, control_pipe_consumer_handle); | |
| 511 | |
| 512 { | |
| 513 std::lock_guard<std::mutex> lock(handle_watcher_threads_mutex_); | |
| 514 // Record the thread object so that we can join on it during shutdown. | |
| 515 MOJO_CHECK(handle_watcher_threads_.find(control_pipe_producer_handle) == | |
| 516 handle_watcher_threads_.end()); | |
| 517 handle_watcher_threads_[control_pipe_producer_handle] = thread; | |
| 518 } | |
| 519 | |
| 520 // Return producer end of pipe to caller. | |
| 521 return control_pipe_producer_handle; | |
| 522 } | |
| 523 | |
| 524 void HandleWatcher::ThreadMain(MojoHandle control_pipe_consumer_handle) { | |
| 525 HandleWatcherThreadState state(control_pipe_consumer_handle); | |
| 526 | |
| 527 // Run the main loop. When this returns the handle watcher has exited. | |
| 528 state.Run(); | |
| 529 } | |
| 530 | |
| 531 MojoResult HandleWatcher::SendCommand(MojoHandle control_pipe_producer_handle, | |
| 532 const HandleWatcherCommand& command) { | |
| 533 return MojoWriteMessage(control_pipe_producer_handle, | |
| 534 reinterpret_cast<const void*>(&command), | |
| 535 sizeof(command), | |
| 536 nullptr, | |
| 537 0, | |
| 538 0); | |
| 539 } | |
| 540 | |
| 541 std::thread* HandleWatcher::RemoveLocked(MojoHandle handle) { | |
| 542 std::thread* t; | |
| 543 auto mapping = handle_watcher_threads_.find(handle); | |
| 544 if (mapping == handle_watcher_threads_.end()) { | |
| 545 return nullptr; | |
| 546 } | |
| 547 t = mapping->second; | |
| 548 handle_watcher_threads_.erase(handle); | |
| 549 return t; | |
| 550 } | |
| 551 | |
| 552 void HandleWatcher::Stop(MojoHandle control_pipe_producer_handle) { | |
| 553 std::thread *t; | |
| 554 { | |
| 555 std::lock_guard<std::mutex> lock(handle_watcher_threads_mutex_); | |
| 556 t = RemoveLocked(control_pipe_producer_handle); | |
| 557 } | |
| 558 | |
| 559 if (t == nullptr) { | |
| 560 return; | |
| 561 } | |
| 562 | |
| 563 SendCommand(control_pipe_producer_handle, HandleWatcherCommand::Shutdown()); | |
| 564 t->join(); | |
| 565 | |
| 566 MojoClose(control_pipe_producer_handle); | |
| 567 delete t; | |
| 568 } | |
| 569 | |
| 570 void HandleWatcher::StopLocked(MojoHandle handle) { | |
| 571 std::thread *t = RemoveLocked(handle); | |
| 572 MOJO_CHECK(t != nullptr); | |
| 573 | |
| 574 SendCommand(handle, HandleWatcherCommand::Shutdown()); | |
| 575 t->join(); | |
| 576 | |
| 577 MojoClose(handle); | |
| 578 delete t; | |
| 579 } | |
| 580 | |
| 581 void HandleWatcher::StopAll() { | |
| 582 std::lock_guard<std::mutex> lock(handle_watcher_threads_mutex_); | |
| 583 | |
| 584 std::vector<MojoHandle> control_handles; | |
| 585 control_handles.reserve(handle_watcher_threads_.size()); | |
| 586 | |
| 587 for (const auto& it : handle_watcher_threads_) { | |
| 588 control_handles.push_back(it.first); | |
| 589 } | |
| 590 | |
| 591 for (auto it : control_handles) { | |
| 592 StopLocked(it); | |
| 593 } | |
| 594 } | |
| 595 | |
| 596 } // namespace dart | |
| 597 } // namespace mojo | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2250183003:
Make the fuchsia mojo/public repo the source of truth. (Closed)
Base URL: https://github.com/domokit/mojo.git@master