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Issue 16897006: Move message_pump to base/message_loop. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 7 years, 6 months ago
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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_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 base::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
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