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Add custom run loop source to signal if new jobs are enqueued in ASRunLoopQueue

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It is not guaranteed that the runloop will turn if it has no scheduled work, and this causes processing of the queue to stop. Attaching a custom loop source to the run loop and signal it if new work needs to be done
This commit is contained in:
Michael Schneider
2016-03-18 14:02:27 -07:00
parent c8cbd2ec4a
commit d1756baae7
1 changed files with 20 additions and 0 deletions
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20
AsyncDisplayKit/ASRunLoopQueue.mm
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@@ -11,9 +11,14 @@
#import <deque>
static void runLoopSourceCallback(void *info) {
// No-op
}
@interface ASRunLoopQueue () {
CFRunLoopRef _runLoop;
CFRunLoopObserverRef _runLoopObserver;
CFRunLoopSourceRef _runLoopSource;
std::deque<id> _internalQueue;
ASDN::RecursiveMutex _internalQueueLock;
}
@@ -36,12 +41,24 @@
};
_runLoopObserver = CFRunLoopObserverCreateWithHandler(NULL, kCFRunLoopBeforeWaiting, true, 0, handlerBlock);
CFRunLoopAddObserver(_runLoop, _runLoopObserver, kCFRunLoopCommonModes);
// It is not guaranteed that the runloop will turn if it has no scheduled work, and this causes processing of
// the queue to stop. Attaching a custom loop source to the run loop and signal it if new work needs to be done
CFRunLoopSourceContext runLoopSourceContext = {0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &runLoopSourceCallback};
_runLoopSource = CFRunLoopSourceCreate(NULL, 0, &runLoopSourceContext);
CFRunLoopAddSource(runloop, _runLoopSource, kCFRunLoopCommonModes);
}
return self;
}
- (void)dealloc
{
if (CFRunLoopContainsSource(_runLoop, _runLoopSource, kCFRunLoopCommonModes)) {
CFRunLoopRemoveSource(_runLoop, _runLoopSource, kCFRunLoopCommonModes);
}
CFRelease(_runLoopSource);
_runLoopSource = nil;
if (CFRunLoopObserverIsValid(_runLoopObserver)) {
CFRunLoopObserverInvalidate(_runLoopObserver);
}
@@ -103,6 +120,9 @@
if (!foundObject) {
_internalQueue.push_back(object);
CFRunLoopSourceSignal(_runLoopSource);
CFRunLoopWakeUp(_runLoop);
}
}