The Tor Browser: ipc/chromium/src/base/message_pump

ipc/chromium/src/base/message_pump_mac.mm@6474c204b198 (annotated)

ipc/chromium/src/base/message_pump_mac.mm

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // Copyright (c) 2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include "base/message_pump_mac.h"
 #import <AppKit/AppKit.h>
 #import <Foundation/Foundation.h>
 #include <IOKit/IOMessage.h>
 #include <IOKit/pwr_mgt/IOPMLib.h>
 #include <limits>
 #import "base/chrome_application_mac.h"
 #include "base/logging.h"
 #include "base/time.h"
 namespace {
 void NoOp(void* info) {
 }
 const CFTimeInterval kCFTimeIntervalMax =
     std::numeric_limits<CFTimeInterval>::max();
 }  // namespace
 namespace base {
 // A scoper for autorelease pools created from message pump run loops.
 // Avoids dirtying up the ScopedNSAutoreleasePool interface for the rare
 // case where an autorelease pool needs to be passed in.
 class MessagePumpScopedAutoreleasePool {
  public:
   explicit MessagePumpScopedAutoreleasePool(MessagePumpCFRunLoopBase* pump) :
       pool_(pump->CreateAutoreleasePool()) {
   }
    ~MessagePumpScopedAutoreleasePool() {
     [pool_ drain];
   }
  private:
   NSAutoreleasePool* pool_;
   DISALLOW_COPY_AND_ASSIGN(MessagePumpScopedAutoreleasePool);
 };
 // Must be called on the run loop thread.
 MessagePumpCFRunLoopBase::MessagePumpCFRunLoopBase()
     : delegate_(NULL),
       delayed_work_fire_time_(kCFTimeIntervalMax),
       nesting_level_(0),
       run_nesting_level_(0),
       deepest_nesting_level_(0),
       delegateless_work_(false),
       delegateless_delayed_work_(false),
       delegateless_idle_work_(false) {
   run_loop_ = CFRunLoopGetCurrent();
   CFRetain(run_loop_);
   // Set a repeating timer with a preposterous firing time and interval.  The
   // timer will effectively never fire as-is.  The firing time will be adjusted
   // as needed when ScheduleDelayedWork is called.
   CFRunLoopTimerContext timer_context = CFRunLoopTimerContext();
   timer_context.info = this;
   delayed_work_timer_ = CFRunLoopTimerCreate(NULL,                // allocator
                                              kCFTimeIntervalMax,  // fire time
                                              kCFTimeIntervalMax,  // interval
 ,                   // flags
 ,                   // priority
                                              RunDelayedWorkTimer,
                                              &timer_context);
   CFRunLoopAddTimer(run_loop_, delayed_work_timer_, kCFRunLoopCommonModes);
   CFRunLoopSourceContext source_context = CFRunLoopSourceContext();
   source_context.info = this;
   source_context.perform = RunWorkSource;
   work_source_ = CFRunLoopSourceCreate(NULL,  // allocator
 ,     // priority
                                        &source_context);
   CFRunLoopAddSource(run_loop_, work_source_, kCFRunLoopCommonModes);
   source_context.perform = RunDelayedWorkSource;
   delayed_work_source_ = CFRunLoopSourceCreate(NULL,  // allocator
 ,     // priority
                                                &source_context);
   CFRunLoopAddSource(run_loop_, delayed_work_source_, kCFRunLoopCommonModes);
   source_context.perform = RunIdleWorkSource;
   idle_work_source_ = CFRunLoopSourceCreate(NULL,  // allocator
 ,     // priority
                                             &source_context);
   CFRunLoopAddSource(run_loop_, idle_work_source_, kCFRunLoopCommonModes);
   source_context.perform = RunNestingDeferredWorkSource;
   nesting_deferred_work_source_ = CFRunLoopSourceCreate(NULL,  // allocator
 ,     // priority
                                                         &source_context);
   CFRunLoopAddSource(run_loop_, nesting_deferred_work_source_,
                      kCFRunLoopCommonModes);
   CFRunLoopObserverContext observer_context = CFRunLoopObserverContext();
   observer_context.info = this;
   pre_wait_observer_ = CFRunLoopObserverCreate(NULL,  // allocator
                                                kCFRunLoopBeforeWaiting,
                                                true,  // repeat
 ,     // priority
                                                PreWaitObserver,
                                                &observer_context);
   CFRunLoopAddObserver(run_loop_, pre_wait_observer_, kCFRunLoopCommonModes);
   pre_source_observer_ = CFRunLoopObserverCreate(NULL,  // allocator
                                                  kCFRunLoopBeforeSources,
                                                  true,  // repeat
 ,     // priority
                                                  PreSourceObserver,
                                                  &observer_context);
   CFRunLoopAddObserver(run_loop_, pre_source_observer_, kCFRunLoopCommonModes);
   enter_exit_observer_ = CFRunLoopObserverCreate(NULL,  // allocator
                                                  kCFRunLoopEntry |
                                                      kCFRunLoopExit,
                                                  true,  // repeat
 ,     // priority
                                                  EnterExitObserver,
                                                  &observer_context);
   CFRunLoopAddObserver(run_loop_, enter_exit_observer_, kCFRunLoopCommonModes);
   root_power_domain_ = IORegisterForSystemPower(this,
                                                 &power_notification_port_,
                                                 PowerStateNotification,
                                                 &power_notification_object_);
   if (root_power_domain_ != MACH_PORT_NULL) {
     CFRunLoopAddSource(
         run_loop_,
         IONotificationPortGetRunLoopSource(power_notification_port_),
         kCFRunLoopCommonModes);
   }
 }
 // Ideally called on the run loop thread.  If other run loops were running
 // lower on the run loop thread's stack when this object was created, the
 // same number of run loops must be running when this object is destroyed.
 MessagePumpCFRunLoopBase::~MessagePumpCFRunLoopBase() {
   if (root_power_domain_ != MACH_PORT_NULL) {
     CFRunLoopRemoveSource(
         run_loop_,
         IONotificationPortGetRunLoopSource(power_notification_port_),
         kCFRunLoopCommonModes);
     IODeregisterForSystemPower(&power_notification_object_);
     IOServiceClose(root_power_domain_);
     IONotificationPortDestroy(power_notification_port_);
   }
   CFRunLoopRemoveObserver(run_loop_, enter_exit_observer_,
                           kCFRunLoopCommonModes);
   CFRelease(enter_exit_observer_);
   CFRunLoopRemoveObserver(run_loop_, pre_source_observer_,
                           kCFRunLoopCommonModes);
   CFRelease(pre_source_observer_);
   CFRunLoopRemoveObserver(run_loop_, pre_wait_observer_,
                           kCFRunLoopCommonModes);
   CFRelease(pre_wait_observer_);
   CFRunLoopRemoveSource(run_loop_, nesting_deferred_work_source_,
                         kCFRunLoopCommonModes);
   CFRelease(nesting_deferred_work_source_);
   CFRunLoopRemoveSource(run_loop_, idle_work_source_, kCFRunLoopCommonModes);
   CFRelease(idle_work_source_);
   CFRunLoopRemoveSource(run_loop_, delayed_work_source_, kCFRunLoopCommonModes);
   CFRelease(delayed_work_source_);
   CFRunLoopRemoveSource(run_loop_, work_source_, kCFRunLoopCommonModes);
   CFRelease(work_source_);
   CFRunLoopRemoveTimer(run_loop_, delayed_work_timer_, kCFRunLoopCommonModes);
   CFRelease(delayed_work_timer_);
   CFRelease(run_loop_);
 }
 // Must be called on the run loop thread.
 void MessagePumpCFRunLoopBase::Run(Delegate* delegate) {
   // nesting_level_ will be incremented in EnterExitRunLoop, so set
   // run_nesting_level_ accordingly.
   int last_run_nesting_level = run_nesting_level_;
   run_nesting_level_ = nesting_level_ + 1;
   Delegate* last_delegate = delegate_;
   delegate_ = delegate;
   if (delegate) {
     // If any work showed up but could not be dispatched for want of a
     // delegate, set it up for dispatch again now that a delegate is
     // available.
     if (delegateless_work_) {
       CFRunLoopSourceSignal(work_source_);
       delegateless_work_ = false;
     }
     if (delegateless_delayed_work_) {
       CFRunLoopSourceSignal(delayed_work_source_);
       delegateless_delayed_work_ = false;
     }
     if (delegateless_idle_work_) {
       CFRunLoopSourceSignal(idle_work_source_);
       delegateless_idle_work_ = false;
     }
   }
   DoRun(delegate);
   // Restore the previous state of the object.
   delegate_ = last_delegate;
   run_nesting_level_ = last_run_nesting_level;
 }
 // May be called on any thread.
 void MessagePumpCFRunLoopBase::ScheduleWork() {
   CFRunLoopSourceSignal(work_source_);
   CFRunLoopWakeUp(run_loop_);
 }
 // Must be called on the run loop thread.
 void MessagePumpCFRunLoopBase::ScheduleDelayedWork(
     const TimeTicks& delayed_work_time) {
   TimeDelta delta = delayed_work_time - TimeTicks::Now();
   delayed_work_fire_time_ = CFAbsoluteTimeGetCurrent() + delta.InSecondsF();
   CFRunLoopTimerSetNextFireDate(delayed_work_timer_, delayed_work_fire_time_);
 }
 // Called from the run loop.
 // static
 void MessagePumpCFRunLoopBase::RunDelayedWorkTimer(CFRunLoopTimerRef timer,
                                                    void* info) {
   MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info);
   // The timer won't fire again until it's reset.
   self->delayed_work_fire_time_ = kCFTimeIntervalMax;
   // CFRunLoopTimers fire outside of the priority scheme for CFRunLoopSources.
   // In order to establish the proper priority where delegate_->DoDelayedWork
   // can only be called if delegate_->DoWork returns false, the timer used
   // to schedule delayed work must signal a CFRunLoopSource set at a lower
   // priority than the one used for delegate_->DoWork.
   CFRunLoopSourceSignal(self->delayed_work_source_);
 }
 // Called from the run loop.
 // static
 void MessagePumpCFRunLoopBase::RunWorkSource(void* info) {
   MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info);
   self->RunWork();
 }
 // Called by MessagePumpCFRunLoopBase::RunWorkSource.
 bool MessagePumpCFRunLoopBase::RunWork() {
   if (!delegate_) {
     // This point can be reached with a NULL delegate_ if Run is not on the
     // stack but foreign code is spinning the CFRunLoop.  Arrange to come back
     // here when a delegate is available.
     delegateless_work_ = true;
     return false;
   }
   // The NSApplication-based run loop only drains the autorelease pool at each
   // UI event (NSEvent).  The autorelease pool is not drained for each
   // CFRunLoopSource target that's run.  Use a local pool for any autoreleased
   // objects if the app is not currently handling a UI event to ensure they're
   // released promptly even in the absence of UI events.
   MessagePumpScopedAutoreleasePool autorelease_pool(this);
   // Call DoWork once, and if something was done, arrange to come back here
   // again as long as the loop is still running.
   bool did_work = delegate_->DoWork();
   if (did_work) {
     CFRunLoopSourceSignal(work_source_);
   }
   return did_work;
 }
 // Called from the run loop.
 // static
 void MessagePumpCFRunLoopBase::RunDelayedWorkSource(void* info) {
   MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info);
   self->RunDelayedWork();
 }
 // Called by MessagePumpCFRunLoopBase::RunDelayedWorkSource.
 bool MessagePumpCFRunLoopBase::RunDelayedWork() {
   if (!delegate_) {
     // This point can be reached with a NULL delegate_ if Run is not on the
     // stack but foreign code is spinning the CFRunLoop.  Arrange to come back
     // here when a delegate is available.
     delegateless_delayed_work_ = true;
     return false;
   }
   // The NSApplication-based run loop only drains the autorelease pool at each
   // UI event (NSEvent).  The autorelease pool is not drained for each
   // CFRunLoopSource target that's run.  Use a local pool for any autoreleased
   // objects if the app is not currently handling a UI event to ensure they're
   // released promptly even in the absence of UI events.
   MessagePumpScopedAutoreleasePool autorelease_pool(this);
   TimeTicks next_time;
   delegate_->DoDelayedWork(&next_time);
   bool more_work = !next_time.is_null();
   if (more_work) {
     TimeDelta delay = next_time - TimeTicks::Now();
     if (delay > TimeDelta()) {
       // There's more delayed work to be done in the future.
       ScheduleDelayedWork(next_time);
     } else {
       // There's more delayed work to be done, and its time is in the past.
       // Arrange to come back here directly as long as the loop is still
       // running.
       CFRunLoopSourceSignal(delayed_work_source_);
     }
   }
   return more_work;
 }
 // Called from the run loop.
 // static
 void MessagePumpCFRunLoopBase::RunIdleWorkSource(void* info) {
   MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info);
   self->RunIdleWork();
 }
 // Called by MessagePumpCFRunLoopBase::RunIdleWorkSource.
 bool MessagePumpCFRunLoopBase::RunIdleWork() {
   if (!delegate_) {
     // This point can be reached with a NULL delegate_ if Run is not on the
     // stack but foreign code is spinning the CFRunLoop.  Arrange to come back
     // here when a delegate is available.
     delegateless_idle_work_ = true;
     return false;
   }
   // The NSApplication-based run loop only drains the autorelease pool at each
   // UI event (NSEvent).  The autorelease pool is not drained for each
   // CFRunLoopSource target that's run.  Use a local pool for any autoreleased
   // objects if the app is not currently handling a UI event to ensure they're
   // released promptly even in the absence of UI events.
   MessagePumpScopedAutoreleasePool autorelease_pool(this);
   // Call DoIdleWork once, and if something was done, arrange to come back here
   // again as long as the loop is still running.
   bool did_work = delegate_->DoIdleWork();
   if (did_work) {
     CFRunLoopSourceSignal(idle_work_source_);
   }
   return did_work;
 }
 // Called from the run loop.
 // static
 void MessagePumpCFRunLoopBase::RunNestingDeferredWorkSource(void* info) {
   MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info);
   self->RunNestingDeferredWork();
 }
 // Called by MessagePumpCFRunLoopBase::RunNestingDeferredWorkSource.
 bool MessagePumpCFRunLoopBase::RunNestingDeferredWork() {
   if (!delegate_) {
     // This point can be reached with a NULL delegate_ if Run is not on the
     // stack but foreign code is spinning the CFRunLoop.  There's no sense in
     // attempting to do any work or signalling the work sources because
     // without a delegate, work is not possible.
     return false;
   }
   // Immediately try work in priority order.
   if (!RunWork()) {
     if (!RunDelayedWork()) {
       if (!RunIdleWork()) {
         return false;
       }
     } else {
       // There was no work, and delayed work was done.  Arrange for the loop
       // to try non-nestable idle work on a subsequent pass.
       CFRunLoopSourceSignal(idle_work_source_);
     }
   } else {
     // Work was done.  Arrange for the loop to try non-nestable delayed and
     // idle work on a subsequent pass.
     CFRunLoopSourceSignal(delayed_work_source_);
     CFRunLoopSourceSignal(idle_work_source_);
   }
   return true;
 }
 // Called before the run loop goes to sleep or exits, or processes sources.
 void MessagePumpCFRunLoopBase::MaybeScheduleNestingDeferredWork() {
   // deepest_nesting_level_ is set as run loops are entered.  If the deepest
   // level encountered is deeper than the current level, a nested loop
   // (relative to the current level) ran since the last time nesting-deferred
   // work was scheduled.  When that situation is encountered, schedule
   // nesting-deferred work in case any work was deferred because nested work
   // was disallowed.
   if (deepest_nesting_level_ > nesting_level_) {
     deepest_nesting_level_ = nesting_level_;
     CFRunLoopSourceSignal(nesting_deferred_work_source_);
   }
 }
 // Called from the run loop.
 // static
 void MessagePumpCFRunLoopBase::PreWaitObserver(CFRunLoopObserverRef observer,
                                                CFRunLoopActivity activity,
                                                void* info) {
   MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info);
   // Attempt to do some idle work before going to sleep.
   self->RunIdleWork();
   // The run loop is about to go to sleep.  If any of the work done since it
   // started or woke up resulted in a nested run loop running,
   // nesting-deferred work may have accumulated.  Schedule it for processing
   // if appropriate.
   self->MaybeScheduleNestingDeferredWork();
 }
 // Called from the run loop.
 // static
 void MessagePumpCFRunLoopBase::PreSourceObserver(CFRunLoopObserverRef observer,
                                                  CFRunLoopActivity activity,
                                                  void* info) {
   MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info);
   // The run loop has reached the top of the loop and is about to begin
   // processing sources.  If the last iteration of the loop at this nesting
   // level did not sleep or exit, nesting-deferred work may have accumulated
   // if a nested loop ran.  Schedule nesting-deferred work for processing if
   // appropriate.
   self->MaybeScheduleNestingDeferredWork();
 }
 // Called from the run loop.
 // static
 void MessagePumpCFRunLoopBase::EnterExitObserver(CFRunLoopObserverRef observer,
                                                  CFRunLoopActivity activity,
                                                  void* info) {
   MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info);
   switch (activity) {
     case kCFRunLoopEntry:
       ++self->nesting_level_;
       if (self->nesting_level_ > self->deepest_nesting_level_) {
         self->deepest_nesting_level_ = self->nesting_level_;
       }
       break;
     case kCFRunLoopExit:
       // Not all run loops go to sleep.  If a run loop is stopped before it
       // goes to sleep due to a CFRunLoopStop call, or if the timeout passed
       // to CFRunLoopRunInMode expires, the run loop may proceed directly from
       // handling sources to exiting without any sleep.  This most commonly
       // occurs when CFRunLoopRunInMode is passed a timeout of 0, causing it
       // to make a single pass through the loop and exit without sleep.  Some
       // native loops use CFRunLoop in this way.  Because PreWaitObserver will
       // not be called in these case, MaybeScheduleNestingDeferredWork needs
       // to be called here, as the run loop exits.
       //
       // MaybeScheduleNestingDeferredWork consults self->nesting_level_
       // to determine whether to schedule nesting-deferred work.  It expects
       // the nesting level to be set to the depth of the loop that is going
       // to sleep or exiting.  It must be called before decrementing the
       // value so that the value still corresponds to the level of the exiting
       // loop.
       self->MaybeScheduleNestingDeferredWork();
       --self->nesting_level_;
       break;
     default:
       break;
   }
   self->EnterExitRunLoop(activity);
 }
 // Called from the run loop.
 // static
 void MessagePumpCFRunLoopBase::PowerStateNotification(void* info,
                                                       io_service_t service,
                                                       uint32_t message_type,
                                                       void* message_argument) {
   // CFRunLoopTimer (NSTimer) is scheduled in terms of CFAbsoluteTime, which
   // measures the number of seconds since 2001-01-01 00:00:00.0 Z.  It is
   // implemented in terms of kernel ticks, as in mach_absolute_time.  While an
   // offset and scale factor can be applied to convert between the two time
   // bases at any time after boot, the kernel clock stops while the system is
   // asleep, altering the offset.  (The offset will also change when the
   // real-time clock is adjusted.)  CFRunLoopTimers are not readjusted to take
   // this into account when the system wakes up, so any timers that were
   // pending while the system was asleep will be delayed by the sleep
   // duration.
   //
   // The MessagePump interface assumes that scheduled delayed work will be
   // performed at the time ScheduleDelayedWork was asked to perform it.  The
   // delay caused by the CFRunLoopTimer not firing at the appropriate time
   // results in a stall of queued delayed work when the system wakes up.
   // With this limitation, scheduled work would not be performed until
   // (system wake time + scheduled work time - system sleep time), while it
   // would be expected to be performed at (scheduled work time).
   //
   // To work around this problem, when the system wakes up from sleep, if a
   // delayed work timer is pending, it is rescheduled to fire at the original
   // time that it was scheduled to fire.
   //
   // This mechanism is not resilient if the real-time clock does not maintain
   // stable time while the system is sleeping, but it matches the behavior of
   // the various other MessagePump implementations, and MessageLoop seems to
   // be limited in the same way.
   //
   // References
   //  - Chris Kane, "NSTimer and deep sleep," cocoa-dev@lists.apple.com,
   //    http://lists.apple.com/archives/Cocoa-dev/2002/May/msg01547.html
   //  - Apple Technical Q&A QA1340, "Registering and unregistering for sleep
   //    and wake notifications,"
   //    http://developer.apple.com/mac/library/qa/qa2004/qa1340.html
   //  - Core Foundation source code, CF-550/CFRunLoop.c and CF-550/CFDate.c,
   //    http://www.opensource.apple.com/
   MessagePumpCFRunLoopBase* self = static_cast<MessagePumpCFRunLoopBase*>(info);
   switch (message_type) {
     case kIOMessageSystemWillPowerOn:
       if (self->delayed_work_fire_time_ != kCFTimeIntervalMax) {
         CFRunLoopTimerSetNextFireDate(self->delayed_work_timer_,
                                       self->delayed_work_fire_time_);
       }
       break;
     case kIOMessageSystemWillSleep:
     case kIOMessageCanSystemSleep:
       // The system will wait for 30 seconds before entering sleep if neither
       // IOAllowPowerChange nor IOCancelPowerChange are called.  That would be
       // pretty antisocial.
       IOAllowPowerChange(self->root_power_domain_,
                          reinterpret_cast<long>(message_argument));
       break;
     default:
       break;
   }
 }
 // Called by MessagePumpCFRunLoopBase::EnterExitRunLoop.  The default
 // implementation is a no-op.
 void MessagePumpCFRunLoopBase::EnterExitRunLoop(CFRunLoopActivity activity) {
 }
 // Base version returns a standard NSAutoreleasePool.
 NSAutoreleasePool* MessagePumpCFRunLoopBase::CreateAutoreleasePool() {
   return [[NSAutoreleasePool alloc] init];
 }
 MessagePumpCFRunLoop::MessagePumpCFRunLoop()
     : quit_pending_(false) {
 }
 // Called by MessagePumpCFRunLoopBase::DoRun.  If other CFRunLoopRun loops were
 // running lower on the run loop thread's stack when this object was created,
 // the same number of CFRunLoopRun loops must be running for the outermost call
 // to Run.  Run/DoRun are reentrant after that point.
 void MessagePumpCFRunLoop::DoRun(Delegate* delegate) {
   // This is completely identical to calling CFRunLoopRun(), except autorelease
   // pool management is introduced.
   int result;
   do {
     MessagePumpScopedAutoreleasePool autorelease_pool(this);
     result = CFRunLoopRunInMode(kCFRunLoopDefaultMode,
                                 kCFTimeIntervalMax,
                                 false);
   } while (result != kCFRunLoopRunStopped && result != kCFRunLoopRunFinished);
 }
 // Must be called on the run loop thread.
 void MessagePumpCFRunLoop::Quit() {
   // Stop the innermost run loop managed by this MessagePumpCFRunLoop object.
   if (nesting_level() == run_nesting_level()) {
     // This object is running the innermost loop, just stop it.
     CFRunLoopStop(run_loop());
   } else {
     // There's another loop running inside the loop managed by this object.
     // In other words, someone else called CFRunLoopRunInMode on the same
     // thread, deeper on the stack than the deepest Run call.  Don't preempt
     // other run loops, just mark this object to quit the innermost Run as
     // soon as the other inner loops not managed by Run are done.
     quit_pending_ = true;
   }
 }
 // Called by MessagePumpCFRunLoopBase::EnterExitObserver.
 void MessagePumpCFRunLoop::EnterExitRunLoop(CFRunLoopActivity activity) {
   if (activity == kCFRunLoopExit &&
       nesting_level() == run_nesting_level() &&
       quit_pending_) {
     // Quit was called while loops other than those managed by this object
     // were running further inside a run loop managed by this object.  Now
     // that all unmanaged inner run loops are gone, stop the loop running
     // just inside Run.
     CFRunLoopStop(run_loop());
     quit_pending_ = false;
   }
 }
 MessagePumpNSRunLoop::MessagePumpNSRunLoop()
     : keep_running_(true) {
   CFRunLoopSourceContext source_context = CFRunLoopSourceContext();
   source_context.perform = NoOp;
   quit_source_ = CFRunLoopSourceCreate(NULL,  // allocator
 ,     // priority
                                        &source_context);
   CFRunLoopAddSource(run_loop(), quit_source_, kCFRunLoopCommonModes);
 }
 MessagePumpNSRunLoop::~MessagePumpNSRunLoop() {
   CFRunLoopRemoveSource(run_loop(), quit_source_, kCFRunLoopCommonModes);
   CFRelease(quit_source_);
 }
 void MessagePumpNSRunLoop::DoRun(Delegate* delegate) {
   while (keep_running_) {
     // NSRunLoop manages autorelease pools itself.
     [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
                              beforeDate:[NSDate distantFuture]];
   }
   keep_running_ = true;
 }
 void MessagePumpNSRunLoop::Quit() {
   keep_running_ = false;
   CFRunLoopSourceSignal(quit_source_);
   CFRunLoopWakeUp(run_loop());
 }
 MessagePumpNSApplication::MessagePumpNSApplication()
     : keep_running_(true),
       running_own_loop_(false) {
 }
 void MessagePumpNSApplication::DoRun(Delegate* delegate) {
   bool last_running_own_loop_ = running_own_loop_;
   // TODO(dmaclach): Get rid of this gratuitous sharedApplication.
   // Tests should be setting up their applications on their own.
   [CrApplication sharedApplication];
   if (![NSApp isRunning]) {
     running_own_loop_ = false;
     // NSApplication manages autorelease pools itself when run this way.
     [NSApp run];
   } else {
     running_own_loop_ = true;
     NSDate* distant_future = [NSDate distantFuture];
     while (keep_running_) {
       MessagePumpScopedAutoreleasePool autorelease_pool(this);
       NSEvent* event = [NSApp nextEventMatchingMask:NSAnyEventMask
                                           untilDate:distant_future
                                              inMode:NSDefaultRunLoopMode
                                             dequeue:YES];
       if (event) {
         [NSApp sendEvent:event];
       }
     }
     keep_running_ = true;
   }
   running_own_loop_ = last_running_own_loop_;
 }
 void MessagePumpNSApplication::Quit() {
   if (!running_own_loop_) {
     [NSApp stop:nil];
   } else {
     keep_running_ = false;
   }
   // Send a fake event to wake the loop up.
   [NSApp postEvent:[NSEvent otherEventWithType:NSApplicationDefined
                                       location:NSMakePoint(0, 0)
                                  modifierFlags:0
                                      timestamp:0
                                   windowNumber:0
                                        context:NULL
                                        subtype:0
                                          data1:0
                                          data2:0]
            atStart:NO];
 }
 // Prevents an autorelease pool from being created if the app is in the midst of
 // handling a UI event because various parts of AppKit depend on objects that
 // are created while handling a UI event to be autoreleased in the event loop.
 // An example of this is NSWindowController. When a window with a window
 // controller is closed it goes through a stack like this:
 // (Several stack frames elided for clarity)
 //
 // #0 [NSWindowController autorelease]
 // #1 DoAClose
 // #2 MessagePumpCFRunLoopBase::DoWork()
 // #3 [NSRunLoop run]
 // #4 [NSButton performClick:]
 // #5 [NSWindow sendEvent:]
 // #6 [NSApp sendEvent:]
 // #7 [NSApp run]
 //
 // -performClick: spins a nested run loop. If the pool created in DoWork was a
 // standard NSAutoreleasePool, it would release the objects that were
 // autoreleased into it once DoWork released it. This would cause the window
 // controller, which autoreleased itself in frame #0, to release itself, and
 // possibly free itself. Unfortunately this window controller controls the
 // window in frame #5. When the stack is unwound to frame #5, the window would
 // no longer exists and crashes may occur. Apple gets around this by never
 // releasing the pool it creates in frame #4, and letting frame #7 clean it up
 // when it cleans up the pool that wraps frame #7. When an autorelease pool is
 // released it releases all other pools that were created after it on the
 // autorelease pool stack.
 //
 // CrApplication is responsible for setting handlingSendEvent to true just
 // before it sends the event throught the event handling mechanism, and
 // returning it to its previous value once the event has been sent.
 NSAutoreleasePool* MessagePumpNSApplication::CreateAutoreleasePool() {
   NSAutoreleasePool* pool = nil;
   DCHECK([NSApp isKindOfClass:[CrApplication class]]);
   if (![static_cast<CrApplication*>(NSApp) isHandlingSendEvent]) {
     pool = MessagePumpCFRunLoopBase::CreateAutoreleasePool();
   }
   return pool;
 }
 // static
 MessagePump* MessagePumpMac::Create() {
   if ([NSThread isMainThread]) {
     return new MessagePumpNSApplication;
   }
   return new MessagePumpNSRunLoop;
 }
 }  // namespace base

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ipc/chromium/src/base/message_pump_mac.mm@6474c204b198 (annotated)

ipc/chromium/src/base/message_pump_mac.mm