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| 1 // Copyright (c) 2012 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 #import "base/message_loop/message_pump_mac.h" | |
| 6 | |
| 7 #import <Foundation/Foundation.h> | |
| 8 | |
| 9 #include <limits> | |
| 10 | |
| 11 #include "base/logging.h" | |
| 12 #include "base/run_loop.h" | |
| 13 #include "base/time.h" | |
| 14 | |
| 15 #if !defined(OS_IOS) | |
| 16 #import <AppKit/AppKit.h> | |
| 17 #endif // !defined(OS_IOS) | |
| 18 | |
| 19 namespace { | |
| 20 | |
| 21 void NoOp(void* info) { | |
| 22 } | |
| 23 | |
| 24 const CFTimeInterval kCFTimeIntervalMax = | |
| 25 std::numeric_limits<CFTimeInterval>::max(); | |
| 26 | |
| 27 #if !defined(OS_IOS) | |
| 28 // Set to true if MessagePumpMac::Create() is called before NSApp is | |
| 29 // initialized. Only accessed from the main thread. | |
| 30 bool g_not_using_cr_app = false; | |
| 31 #endif | |
| 32 | |
| 33 } // namespace | |
| 34 | |
| 35 namespace base { | |
| 36 | |
| 37 // A scoper for autorelease pools created from message pump run loops. | |
| 38 // Avoids dirtying up the ScopedNSAutoreleasePool interface for the rare | |
| 39 // case where an autorelease pool needs to be passed in. | |
| 40 class MessagePumpScopedAutoreleasePool { | |
| 41 public: | |
| 42 explicit MessagePumpScopedAutoreleasePool(MessagePumpCFRunLoopBase* pump) : | |
| 43 pool_(pump->CreateAutoreleasePool()) { | |
| 44 } | |
| 45 ~MessagePumpScopedAutoreleasePool() { | |
| 46 [pool_ drain]; | |
| 47 } | |
| 48 | |
| 49 private: | |
| 50 NSAutoreleasePool* pool_; | |
| 51 DISALLOW_COPY_AND_ASSIGN(MessagePumpScopedAutoreleasePool); | |
| 52 }; | |
| 53 | |
| 54 // Must be called on the run loop thread. | |
| 55 MessagePumpCFRunLoopBase::MessagePumpCFRunLoopBase() | |
| 56 : delegate_(NULL), | |
| 57 delayed_work_fire_time_(kCFTimeIntervalMax), | |
| 58 nesting_level_(0), | |
| 59 run_nesting_level_(0), | |
| 60 deepest_nesting_level_(0), | |
| 61 delegateless_work_(false), | |
| 62 delegateless_idle_work_(false) { | |
| 63 run_loop_ = CFRunLoopGetCurrent(); | |
| 64 CFRetain(run_loop_); | |
| 65 | |
| 66 // Set a repeating timer with a preposterous firing time and interval. The | |
| 67 // timer will effectively never fire as-is. The firing time will be adjusted | |
| 68 // as needed when ScheduleDelayedWork is called. | |
| 69 CFRunLoopTimerContext timer_context = CFRunLoopTimerContext(); | |
| 70 timer_context.info = this; | |
| 71 delayed_work_timer_ = CFRunLoopTimerCreate(NULL, // allocator | |
| 72 kCFTimeIntervalMax, // fire time | |
| 73 kCFTimeIntervalMax, // interval | |
| 74 0, // flags | |
| 75 0, // priority | |
| 76 RunDelayedWorkTimer, | |
| 77 &timer_context); | |
| 78 CFRunLoopAddTimer(run_loop_, delayed_work_timer_, kCFRunLoopCommonModes); | |
| 79 | |
| 80 CFRunLoopSourceContext source_context = CFRunLoopSourceContext(); | |
| 81 source_context.info = this; | |
| 82 source_context.perform = RunWorkSource; | |
| 83 work_source_ = CFRunLoopSourceCreate(NULL, // allocator | |
| 84 1, // priority | |
| 85 &source_context); | |
| 86 CFRunLoopAddSource(run_loop_, work_source_, kCFRunLoopCommonModes); | |
| 87 | |
| 88 source_context.perform = RunIdleWorkSource; | |
| 89 idle_work_source_ = CFRunLoopSourceCreate(NULL, // allocator | |
| 90 2, // priority | |
| 91 &source_context); | |
| 92 CFRunLoopAddSource(run_loop_, idle_work_source_, kCFRunLoopCommonModes); | |
| 93 | |
| 94 source_context.perform = RunNestingDeferredWorkSource; | |
| 95 nesting_deferred_work_source_ = CFRunLoopSourceCreate(NULL, // allocator | |
| 96 0, // priority | |
| 97 &source_context); | |
| 98 CFRunLoopAddSource(run_loop_, nesting_deferred_work_source_, | |
| 99 kCFRunLoopCommonModes); | |
| 100 | |
| 101 CFRunLoopObserverContext observer_context = CFRunLoopObserverContext(); | |
| 102 observer_context.info = this; | |
| 103 pre_wait_observer_ = CFRunLoopObserverCreate(NULL, // allocator | |
| 104 kCFRunLoopBeforeWaiting, | |
| 105 true, // repeat | |
| 106 0, // priority | |
| 107 PreWaitObserver, | |
| 108 &observer_context); | |
| 109 CFRunLoopAddObserver(run_loop_, pre_wait_observer_, kCFRunLoopCommonModes); | |
| 110 | |
| 111 pre_source_observer_ = CFRunLoopObserverCreate(NULL, // allocator | |
| 112 kCFRunLoopBeforeSources, | |
| 113 true, // repeat | |
| 114 0, // priority | |
| 115 PreSourceObserver, | |
| 116 &observer_context); | |
| 117 CFRunLoopAddObserver(run_loop_, pre_source_observer_, kCFRunLoopCommonModes); | |
| 118 | |
| 119 enter_exit_observer_ = CFRunLoopObserverCreate(NULL, // allocator | |
| 120 kCFRunLoopEntry | | |
| 121 kCFRunLoopExit, | |
| 122 true, // repeat | |
| 123 0, // priority | |
| 124 EnterExitObserver, | |
| 125 &observer_context); | |
| 126 CFRunLoopAddObserver(run_loop_, enter_exit_observer_, kCFRunLoopCommonModes); | |
| 127 } | |
| 128 | |
| 129 // Ideally called on the run loop thread. If other run loops were running | |
| 130 // lower on the run loop thread's stack when this object was created, the | |
| 131 // same number of run loops must be running when this object is destroyed. | |
| 132 MessagePumpCFRunLoopBase::~MessagePumpCFRunLoopBase() { | |
| 133 CFRunLoopRemoveObserver(run_loop_, enter_exit_observer_, | |
| 134 kCFRunLoopCommonModes); | |
| 135 CFRelease(enter_exit_observer_); | |
| 136 | |
| 137 CFRunLoopRemoveObserver(run_loop_, pre_source_observer_, | |
| 138 kCFRunLoopCommonModes); | |
| 139 CFRelease(pre_source_observer_); | |
| 140 | |
| 141 CFRunLoopRemoveObserver(run_loop_, pre_wait_observer_, | |
| 142 kCFRunLoopCommonModes); | |
| 143 CFRelease(pre_wait_observer_); | |
| 144 | |
| 145 CFRunLoopRemoveSource(run_loop_, nesting_deferred_work_source_, | |
| 146 kCFRunLoopCommonModes); | |
| 147 CFRelease(nesting_deferred_work_source_); | |
| 148 | |
| 149 CFRunLoopRemoveSource(run_loop_, idle_work_source_, kCFRunLoopCommonModes); | |
| 150 CFRelease(idle_work_source_); | |
| 151 | |
| 152 CFRunLoopRemoveSource(run_loop_, work_source_, kCFRunLoopCommonModes); | |
| 153 CFRelease(work_source_); | |
| 154 | |
| 155 CFRunLoopRemoveTimer(run_loop_, delayed_work_timer_, kCFRunLoopCommonModes); | |
| 156 CFRelease(delayed_work_timer_); | |
| 157 | |
| 158 CFRelease(run_loop_); | |
| 159 } | |
| 160 | |
| 161 // Must be called on the run loop thread. | |
| 162 void MessagePumpCFRunLoopBase::Run(Delegate* delegate) { | |
| 163 // nesting_level_ will be incremented in EnterExitRunLoop, so set | |
| 164 // run_nesting_level_ accordingly. | |
| 165 int last_run_nesting_level = run_nesting_level_; | |
| 166 run_nesting_level_ = nesting_level_ + 1; | |
| 167 | |
| 168 Delegate* last_delegate = delegate_; | |
| 169 SetDelegate(delegate); | |
| 170 | |
| 171 DoRun(delegate); | |
| 172 | |
| 173 // Restore the previous state of the object. | |
| 174 SetDelegate(last_delegate); | |
| 175 run_nesting_level_ = last_run_nesting_level; | |
| 176 } | |
| 177 | |
| 178 void MessagePumpCFRunLoopBase::SetDelegate(Delegate* delegate) { | |
| 179 delegate_ = delegate; | |
| 180 | |
| 181 if (delegate) { | |
| 182 // If any work showed up but could not be dispatched for want of a | |
| 183 // delegate, set it up for dispatch again now that a delegate is | |
| 184 // available. | |
| 185 if (delegateless_work_) { | |
| 186 CFRunLoopSourceSignal(work_source_); | |
| 187 delegateless_work_ = false; | |
| 188 } | |
| 189 if (delegateless_idle_work_) { | |
| 190 CFRunLoopSourceSignal(idle_work_source_); | |
| 191 delegateless_idle_work_ = false; | |
| 192 } | |
| 193 } | |
| 194 } | |
| 195 | |
| 196 // May be called on any thread. | |
| 197 void MessagePumpCFRunLoopBase::ScheduleWork() { | |
| 198 CFRunLoopSourceSignal(work_source_); | |
| 199 CFRunLoopWakeUp(run_loop_); | |
| 200 } | |
| 201 | |
| 202 // Must be called on the run loop thread. | |
| 203 void MessagePumpCFRunLoopBase::ScheduleDelayedWork( | |
| 204 const TimeTicks& delayed_work_time) { | |
| 205 TimeDelta delta = delayed_work_time - TimeTicks::Now(); | |
| 206 delayed_work_fire_time_ = CFAbsoluteTimeGetCurrent() + delta.InSecondsF(); | |
| 207 CFRunLoopTimerSetNextFireDate(delayed_work_timer_, delayed_work_fire_time_); | |
| 208 } | |
| 209 | |
| 210 // Called from the run loop. | |
| 211 // static | |
| 212 void MessagePumpCFRunLoopBase::RunDelayedWorkTimer(CFRunLoopTimerRef timer, | |
| 213 void* info) { | |
| 214 MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info); | |
| 215 | |
| 216 // The timer won't fire again until it's reset. | |
| 217 self->delayed_work_fire_time_ = kCFTimeIntervalMax; | |
| 218 | |
| 219 // CFRunLoopTimers fire outside of the priority scheme for CFRunLoopSources. | |
| 220 // In order to establish the proper priority in which work and delayed work | |
| 221 // are processed one for one, the timer used to schedule delayed work must | |
| 222 // signal a CFRunLoopSource used to dispatch both work and delayed work. | |
| 223 CFRunLoopSourceSignal(self->work_source_); | |
| 224 } | |
| 225 | |
| 226 // Called from the run loop. | |
| 227 // static | |
| 228 void MessagePumpCFRunLoopBase::RunWorkSource(void* info) { | |
| 229 MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info); | |
| 230 self->RunWork(); | |
| 231 } | |
| 232 | |
| 233 // Called by MessagePumpCFRunLoopBase::RunWorkSource. | |
| 234 bool MessagePumpCFRunLoopBase::RunWork() { | |
| 235 if (!delegate_) { | |
| 236 // This point can be reached with a NULL delegate_ if Run is not on the | |
| 237 // stack but foreign code is spinning the CFRunLoop. Arrange to come back | |
| 238 // here when a delegate is available. | |
| 239 delegateless_work_ = true; | |
| 240 return false; | |
| 241 } | |
| 242 | |
| 243 // The NSApplication-based run loop only drains the autorelease pool at each | |
| 244 // UI event (NSEvent). The autorelease pool is not drained for each | |
| 245 // CFRunLoopSource target that's run. Use a local pool for any autoreleased | |
| 246 // objects if the app is not currently handling a UI event to ensure they're | |
| 247 // released promptly even in the absence of UI events. | |
| 248 MessagePumpScopedAutoreleasePool autorelease_pool(this); | |
| 249 | |
| 250 // Call DoWork and DoDelayedWork once, and if something was done, arrange to | |
| 251 // come back here again as long as the loop is still running. | |
| 252 bool did_work = delegate_->DoWork(); | |
| 253 bool resignal_work_source = did_work; | |
| 254 | |
| 255 TimeTicks next_time; | |
| 256 delegate_->DoDelayedWork(&next_time); | |
| 257 if (!did_work) { | |
| 258 // Determine whether there's more delayed work, and if so, if it needs to | |
| 259 // be done at some point in the future or if it's already time to do it. | |
| 260 // Only do these checks if did_work is false. If did_work is true, this | |
| 261 // function, and therefore any additional delayed work, will get another | |
| 262 // chance to run before the loop goes to sleep. | |
| 263 bool more_delayed_work = !next_time.is_null(); | |
| 264 if (more_delayed_work) { | |
| 265 TimeDelta delay = next_time - TimeTicks::Now(); | |
| 266 if (delay > TimeDelta()) { | |
| 267 // There's more delayed work to be done in the future. | |
| 268 ScheduleDelayedWork(next_time); | |
| 269 } else { | |
| 270 // There's more delayed work to be done, and its time is in the past. | |
| 271 // Arrange to come back here directly as long as the loop is still | |
| 272 // running. | |
| 273 resignal_work_source = true; | |
| 274 } | |
| 275 } | |
| 276 } | |
| 277 | |
| 278 if (resignal_work_source) { | |
| 279 CFRunLoopSourceSignal(work_source_); | |
| 280 } | |
| 281 | |
| 282 return resignal_work_source; | |
| 283 } | |
| 284 | |
| 285 // Called from the run loop. | |
| 286 // static | |
| 287 void MessagePumpCFRunLoopBase::RunIdleWorkSource(void* info) { | |
| 288 MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info); | |
| 289 self->RunIdleWork(); | |
| 290 } | |
| 291 | |
| 292 // Called by MessagePumpCFRunLoopBase::RunIdleWorkSource. | |
| 293 bool MessagePumpCFRunLoopBase::RunIdleWork() { | |
| 294 if (!delegate_) { | |
| 295 // This point can be reached with a NULL delegate_ if Run is not on the | |
| 296 // stack but foreign code is spinning the CFRunLoop. Arrange to come back | |
| 297 // here when a delegate is available. | |
| 298 delegateless_idle_work_ = true; | |
| 299 return false; | |
| 300 } | |
| 301 | |
| 302 // The NSApplication-based run loop only drains the autorelease pool at each | |
| 303 // UI event (NSEvent). The autorelease pool is not drained for each | |
| 304 // CFRunLoopSource target that's run. Use a local pool for any autoreleased | |
| 305 // objects if the app is not currently handling a UI event to ensure they're | |
| 306 // released promptly even in the absence of UI events. | |
| 307 MessagePumpScopedAutoreleasePool autorelease_pool(this); | |
| 308 | |
| 309 // Call DoIdleWork once, and if something was done, arrange to come back here | |
| 310 // again as long as the loop is still running. | |
| 311 bool did_work = delegate_->DoIdleWork(); | |
| 312 if (did_work) { | |
| 313 CFRunLoopSourceSignal(idle_work_source_); | |
| 314 } | |
| 315 | |
| 316 return did_work; | |
| 317 } | |
| 318 | |
| 319 // Called from the run loop. | |
| 320 // static | |
| 321 void MessagePumpCFRunLoopBase::RunNestingDeferredWorkSource(void* info) { | |
| 322 MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info); | |
| 323 self->RunNestingDeferredWork(); | |
| 324 } | |
| 325 | |
| 326 // Called by MessagePumpCFRunLoopBase::RunNestingDeferredWorkSource. | |
| 327 bool MessagePumpCFRunLoopBase::RunNestingDeferredWork() { | |
| 328 if (!delegate_) { | |
| 329 // This point can be reached with a NULL delegate_ if Run is not on the | |
| 330 // stack but foreign code is spinning the CFRunLoop. There's no sense in | |
| 331 // attempting to do any work or signalling the work sources because | |
| 332 // without a delegate, work is not possible. | |
| 333 return false; | |
| 334 } | |
| 335 | |
| 336 // Immediately try work in priority order. | |
| 337 if (!RunWork()) { | |
| 338 if (!RunIdleWork()) { | |
| 339 return false; | |
| 340 } | |
| 341 } else { | |
| 342 // Work was done. Arrange for the loop to try non-nestable idle work on | |
| 343 // a subsequent pass. | |
| 344 CFRunLoopSourceSignal(idle_work_source_); | |
| 345 } | |
| 346 | |
| 347 return true; | |
| 348 } | |
| 349 | |
| 350 // Called before the run loop goes to sleep or exits, or processes sources. | |
| 351 void MessagePumpCFRunLoopBase::MaybeScheduleNestingDeferredWork() { | |
| 352 // deepest_nesting_level_ is set as run loops are entered. If the deepest | |
| 353 // level encountered is deeper than the current level, a nested loop | |
| 354 // (relative to the current level) ran since the last time nesting-deferred | |
| 355 // work was scheduled. When that situation is encountered, schedule | |
| 356 // nesting-deferred work in case any work was deferred because nested work | |
| 357 // was disallowed. | |
| 358 if (deepest_nesting_level_ > nesting_level_) { | |
| 359 deepest_nesting_level_ = nesting_level_; | |
| 360 CFRunLoopSourceSignal(nesting_deferred_work_source_); | |
| 361 } | |
| 362 } | |
| 363 | |
| 364 // Called from the run loop. | |
| 365 // static | |
| 366 void MessagePumpCFRunLoopBase::PreWaitObserver(CFRunLoopObserverRef observer, | |
| 367 CFRunLoopActivity activity, | |
| 368 void* info) { | |
| 369 MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info); | |
| 370 | |
| 371 // Attempt to do some idle work before going to sleep. | |
| 372 self->RunIdleWork(); | |
| 373 | |
| 374 // The run loop is about to go to sleep. If any of the work done since it | |
| 375 // started or woke up resulted in a nested run loop running, | |
| 376 // nesting-deferred work may have accumulated. Schedule it for processing | |
| 377 // if appropriate. | |
| 378 self->MaybeScheduleNestingDeferredWork(); | |
| 379 } | |
| 380 | |
| 381 // Called from the run loop. | |
| 382 // static | |
| 383 void MessagePumpCFRunLoopBase::PreSourceObserver(CFRunLoopObserverRef observer, | |
| 384 CFRunLoopActivity activity, | |
| 385 void* info) { | |
| 386 MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info); | |
| 387 | |
| 388 // The run loop has reached the top of the loop and is about to begin | |
| 389 // processing sources. If the last iteration of the loop at this nesting | |
| 390 // level did not sleep or exit, nesting-deferred work may have accumulated | |
| 391 // if a nested loop ran. Schedule nesting-deferred work for processing if | |
| 392 // appropriate. | |
| 393 self->MaybeScheduleNestingDeferredWork(); | |
| 394 } | |
| 395 | |
| 396 // Called from the run loop. | |
| 397 // static | |
| 398 void MessagePumpCFRunLoopBase::EnterExitObserver(CFRunLoopObserverRef observer, | |
| 399 CFRunLoopActivity activity, | |
| 400 void* info) { | |
| 401 MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info); | |
| 402 | |
| 403 switch (activity) { | |
| 404 case kCFRunLoopEntry: | |
| 405 ++self->nesting_level_; | |
| 406 if (self->nesting_level_ > self->deepest_nesting_level_) { | |
| 407 self->deepest_nesting_level_ = self->nesting_level_; | |
| 408 } | |
| 409 break; | |
| 410 | |
| 411 case kCFRunLoopExit: | |
| 412 // Not all run loops go to sleep. If a run loop is stopped before it | |
| 413 // goes to sleep due to a CFRunLoopStop call, or if the timeout passed | |
| 414 // to CFRunLoopRunInMode expires, the run loop may proceed directly from | |
| 415 // handling sources to exiting without any sleep. This most commonly | |
| 416 // occurs when CFRunLoopRunInMode is passed a timeout of 0, causing it | |
| 417 // to make a single pass through the loop and exit without sleep. Some | |
| 418 // native loops use CFRunLoop in this way. Because PreWaitObserver will | |
| 419 // not be called in these case, MaybeScheduleNestingDeferredWork needs | |
| 420 // to be called here, as the run loop exits. | |
| 421 // | |
| 422 // MaybeScheduleNestingDeferredWork consults self->nesting_level_ | |
| 423 // to determine whether to schedule nesting-deferred work. It expects | |
| 424 // the nesting level to be set to the depth of the loop that is going | |
| 425 // to sleep or exiting. It must be called before decrementing the | |
| 426 // value so that the value still corresponds to the level of the exiting | |
| 427 // loop. | |
| 428 self->MaybeScheduleNestingDeferredWork(); | |
| 429 --self->nesting_level_; | |
| 430 break; | |
| 431 | |
| 432 default: | |
| 433 break; | |
| 434 } | |
| 435 | |
| 436 self->EnterExitRunLoop(activity); | |
| 437 } | |
| 438 | |
| 439 // Called by MessagePumpCFRunLoopBase::EnterExitRunLoop. The default | |
| 440 // implementation is a no-op. | |
| 441 void MessagePumpCFRunLoopBase::EnterExitRunLoop(CFRunLoopActivity activity) { | |
| 442 } | |
| 443 | |
| 444 // Base version returns a standard NSAutoreleasePool. | |
| 445 NSAutoreleasePool* MessagePumpCFRunLoopBase::CreateAutoreleasePool() { | |
| 446 return [[NSAutoreleasePool alloc] init]; | |
| 447 } | |
| 448 | |
| 449 MessagePumpCFRunLoop::MessagePumpCFRunLoop() | |
| 450 : quit_pending_(false) { | |
| 451 } | |
| 452 | |
| 453 MessagePumpCFRunLoop::~MessagePumpCFRunLoop() {} | |
| 454 | |
| 455 // Called by MessagePumpCFRunLoopBase::DoRun. If other CFRunLoopRun loops were | |
| 456 // running lower on the run loop thread's stack when this object was created, | |
| 457 // the same number of CFRunLoopRun loops must be running for the outermost call | |
| 458 // to Run. Run/DoRun are reentrant after that point. | |
| 459 void MessagePumpCFRunLoop::DoRun(Delegate* delegate) { | |
| 460 // This is completely identical to calling CFRunLoopRun(), except autorelease | |
| 461 // pool management is introduced. | |
| 462 int result; | |
| 463 do { | |
| 464 MessagePumpScopedAutoreleasePool autorelease_pool(this); | |
| 465 result = CFRunLoopRunInMode(kCFRunLoopDefaultMode, | |
| 466 kCFTimeIntervalMax, | |
| 467 false); | |
| 468 } while (result != kCFRunLoopRunStopped && result != kCFRunLoopRunFinished); | |
| 469 } | |
| 470 | |
| 471 // Must be called on the run loop thread. | |
| 472 void MessagePumpCFRunLoop::Quit() { | |
| 473 // Stop the innermost run loop managed by this MessagePumpCFRunLoop object. | |
| 474 if (nesting_level() == run_nesting_level()) { | |
| 475 // This object is running the innermost loop, just stop it. | |
| 476 CFRunLoopStop(run_loop()); | |
| 477 } else { | |
| 478 // There's another loop running inside the loop managed by this object. | |
| 479 // In other words, someone else called CFRunLoopRunInMode on the same | |
| 480 // thread, deeper on the stack than the deepest Run call. Don't preempt | |
| 481 // other run loops, just mark this object to quit the innermost Run as | |
| 482 // soon as the other inner loops not managed by Run are done. | |
| 483 quit_pending_ = true; | |
| 484 } | |
| 485 } | |
| 486 | |
| 487 // Called by MessagePumpCFRunLoopBase::EnterExitObserver. | |
| 488 void MessagePumpCFRunLoop::EnterExitRunLoop(CFRunLoopActivity activity) { | |
| 489 if (activity == kCFRunLoopExit && | |
| 490 nesting_level() == run_nesting_level() && | |
| 491 quit_pending_) { | |
| 492 // Quit was called while loops other than those managed by this object | |
| 493 // were running further inside a run loop managed by this object. Now | |
| 494 // that all unmanaged inner run loops are gone, stop the loop running | |
| 495 // just inside Run. | |
| 496 CFRunLoopStop(run_loop()); | |
| 497 quit_pending_ = false; | |
| 498 } | |
| 499 } | |
| 500 | |
| 501 MessagePumpNSRunLoop::MessagePumpNSRunLoop() | |
| 502 : keep_running_(true) { | |
| 503 CFRunLoopSourceContext source_context = CFRunLoopSourceContext(); | |
| 504 source_context.perform = NoOp; | |
| 505 quit_source_ = CFRunLoopSourceCreate(NULL, // allocator | |
| 506 0, // priority | |
| 507 &source_context); | |
| 508 CFRunLoopAddSource(run_loop(), quit_source_, kCFRunLoopCommonModes); | |
| 509 } | |
| 510 | |
| 511 MessagePumpNSRunLoop::~MessagePumpNSRunLoop() { | |
| 512 CFRunLoopRemoveSource(run_loop(), quit_source_, kCFRunLoopCommonModes); | |
| 513 CFRelease(quit_source_); | |
| 514 } | |
| 515 | |
| 516 void MessagePumpNSRunLoop::DoRun(Delegate* delegate) { | |
| 517 while (keep_running_) { | |
| 518 // NSRunLoop manages autorelease pools itself. | |
| 519 [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode | |
| 520 beforeDate:[NSDate distantFuture]]; | |
| 521 } | |
| 522 | |
| 523 keep_running_ = true; | |
| 524 } | |
| 525 | |
| 526 void MessagePumpNSRunLoop::Quit() { | |
| 527 keep_running_ = false; | |
| 528 CFRunLoopSourceSignal(quit_source_); | |
| 529 CFRunLoopWakeUp(run_loop()); | |
| 530 } | |
| 531 | |
| 532 #if defined(OS_IOS) | |
| 533 MessagePumpUIApplication::MessagePumpUIApplication() | |
| 534 : run_loop_(NULL) { | |
| 535 } | |
| 536 | |
| 537 MessagePumpUIApplication::~MessagePumpUIApplication() {} | |
| 538 | |
| 539 void MessagePumpUIApplication::DoRun(Delegate* delegate) { | |
| 540 NOTREACHED(); | |
| 541 } | |
| 542 | |
| 543 void MessagePumpUIApplication::Quit() { | |
| 544 NOTREACHED(); | |
| 545 } | |
| 546 | |
| 547 void MessagePumpUIApplication::Attach(Delegate* delegate) { | |
| 548 DCHECK(!run_loop_); | |
| 549 run_loop_ = new RunLoop(); | |
| 550 CHECK(run_loop_->BeforeRun()); | |
| 551 SetDelegate(delegate); | |
| 552 } | |
| 553 | |
| 554 #else | |
| 555 | |
| 556 MessagePumpNSApplication::MessagePumpNSApplication() | |
| 557 : keep_running_(true), | |
| 558 running_own_loop_(false) { | |
| 559 } | |
| 560 | |
| 561 MessagePumpNSApplication::~MessagePumpNSApplication() {} | |
| 562 | |
| 563 void MessagePumpNSApplication::DoRun(Delegate* delegate) { | |
| 564 bool last_running_own_loop_ = running_own_loop_; | |
| 565 | |
| 566 // NSApp must be initialized by calling: | |
| 567 // [{some class which implements CrAppProtocol} sharedApplication] | |
| 568 // Most likely candidates are CrApplication or BrowserCrApplication. | |
| 569 // These can be initialized from C++ code by calling | |
| 570 // RegisterCrApp() or RegisterBrowserCrApp(). | |
| 571 CHECK(NSApp); | |
| 572 | |
| 573 if (![NSApp isRunning]) { | |
| 574 running_own_loop_ = false; | |
| 575 // NSApplication manages autorelease pools itself when run this way. | |
| 576 [NSApp run]; | |
| 577 } else { | |
| 578 running_own_loop_ = true; | |
| 579 NSDate* distant_future = [NSDate distantFuture]; | |
| 580 while (keep_running_) { | |
| 581 MessagePumpScopedAutoreleasePool autorelease_pool(this); | |
| 582 NSEvent* event = [NSApp nextEventMatchingMask:NSAnyEventMask | |
| 583 untilDate:distant_future | |
| 584 inMode:NSDefaultRunLoopMode | |
| 585 dequeue:YES]; | |
| 586 if (event) { | |
| 587 [NSApp sendEvent:event]; | |
| 588 } | |
| 589 } | |
| 590 keep_running_ = true; | |
| 591 } | |
| 592 | |
| 593 running_own_loop_ = last_running_own_loop_; | |
| 594 } | |
| 595 | |
| 596 void MessagePumpNSApplication::Quit() { | |
| 597 if (!running_own_loop_) { | |
| 598 [[NSApplication sharedApplication] stop:nil]; | |
| 599 } else { | |
| 600 keep_running_ = false; | |
| 601 } | |
| 602 | |
| 603 // Send a fake event to wake the loop up. | |
| 604 [NSApp postEvent:[NSEvent otherEventWithType:NSApplicationDefined | |
| 605 location:NSMakePoint(0, 0) | |
| 606 modifierFlags:0 | |
| 607 timestamp:0 | |
| 608 windowNumber:0 | |
| 609 context:NULL | |
| 610 subtype:0 | |
| 611 data1:0 | |
| 612 data2:0] | |
| 613 atStart:NO]; | |
| 614 } | |
| 615 | |
| 616 MessagePumpCrApplication::MessagePumpCrApplication() { | |
| 617 } | |
| 618 | |
| 619 // Prevents an autorelease pool from being created if the app is in the midst of | |
| 620 // handling a UI event because various parts of AppKit depend on objects that | |
| 621 // are created while handling a UI event to be autoreleased in the event loop. | |
| 622 // An example of this is NSWindowController. When a window with a window | |
| 623 // controller is closed it goes through a stack like this: | |
| 624 // (Several stack frames elided for clarity) | |
| 625 // | |
| 626 // #0 [NSWindowController autorelease] | |
| 627 // #1 DoAClose | |
| 628 // #2 MessagePumpCFRunLoopBase::DoWork() | |
| 629 // #3 [NSRunLoop run] | |
| 630 // #4 [NSButton performClick:] | |
| 631 // #5 [NSWindow sendEvent:] | |
| 632 // #6 [NSApp sendEvent:] | |
| 633 // #7 [NSApp run] | |
| 634 // | |
| 635 // -performClick: spins a nested run loop. If the pool created in DoWork was a | |
| 636 // standard NSAutoreleasePool, it would release the objects that were | |
| 637 // autoreleased into it once DoWork released it. This would cause the window | |
| 638 // controller, which autoreleased itself in frame #0, to release itself, and | |
| 639 // possibly free itself. Unfortunately this window controller controls the | |
| 640 // window in frame #5. When the stack is unwound to frame #5, the window would | |
| 641 // no longer exists and crashes may occur. Apple gets around this by never | |
| 642 // releasing the pool it creates in frame #4, and letting frame #7 clean it up | |
| 643 // when it cleans up the pool that wraps frame #7. When an autorelease pool is | |
| 644 // released it releases all other pools that were created after it on the | |
| 645 // autorelease pool stack. | |
| 646 // | |
| 647 // CrApplication is responsible for setting handlingSendEvent to true just | |
| 648 // before it sends the event through the event handling mechanism, and | |
| 649 // returning it to its previous value once the event has been sent. | |
| 650 NSAutoreleasePool* MessagePumpCrApplication::CreateAutoreleasePool() { | |
| 651 if (MessagePumpMac::IsHandlingSendEvent()) | |
| 652 return nil; | |
| 653 return MessagePumpNSApplication::CreateAutoreleasePool(); | |
| 654 } | |
| 655 | |
| 656 // static | |
| 657 bool MessagePumpMac::UsingCrApp() { | |
| 658 DCHECK([NSThread isMainThread]); | |
| 659 | |
| 660 // If NSApp is still not initialized, then the subclass used cannot | |
| 661 // be determined. | |
| 662 DCHECK(NSApp); | |
| 663 | |
| 664 // The pump was created using MessagePumpNSApplication. | |
| 665 if (g_not_using_cr_app) | |
| 666 return false; | |
| 667 | |
| 668 return [NSApp conformsToProtocol:@protocol(CrAppProtocol)]; | |
| 669 } | |
| 670 | |
| 671 // static | |
| 672 bool MessagePumpMac::IsHandlingSendEvent() { | |
| 673 DCHECK([NSApp conformsToProtocol:@protocol(CrAppProtocol)]); | |
| 674 NSObject<CrAppProtocol>* app = static_cast<NSObject<CrAppProtocol>*>(NSApp); | |
| 675 return [app isHandlingSendEvent]; | |
| 676 } | |
| 677 #endif // !defined(OS_IOS) | |
| 678 | |
| 679 // static | |
| 680 MessagePump* MessagePumpMac::Create() { | |
| 681 if ([NSThread isMainThread]) { | |
| 682 #if defined(OS_IOS) | |
| 683 return new MessagePumpUIApplication; | |
| 684 #else | |
| 685 if ([NSApp conformsToProtocol:@protocol(CrAppProtocol)]) | |
| 686 return new MessagePumpCrApplication; | |
| 687 | |
| 688 // The main-thread MessagePump implementations REQUIRE an NSApp. | |
| 689 // Executables which have specific requirements for their | |
| 690 // NSApplication subclass should initialize appropriately before | |
| 691 // creating an event loop. | |
| 692 [NSApplication sharedApplication]; | |
| 693 g_not_using_cr_app = true; | |
| 694 return new MessagePumpNSApplication; | |
| 695 #endif | |
| 696 } | |
| 697 | |
| 698 return new MessagePumpNSRunLoop; | |
| 699 } | |
| 700 | |
| 701 } // namespace base | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 16897005:
Revert 206507 "Move message_pump to base/message_loop." (Closed)
Base URL: svn://svn.chromium.org/chrome/