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Merge pull request #119 from TomHarte/C11
Ejects the deprecated OSAtomicTestAnd[Re]Set test-and-[re]set in favour of C11's atomic_flag.
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commit
26cb903b08
@ -8,10 +8,12 @@
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#import "CSBestEffortUpdater.h"
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#include <stdatomic.h>
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@implementation CSBestEffortUpdater
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{
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// these are inherently handled only by thread-safe constructions
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uint32_t _updateIsOngoing;
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atomic_flag _updateIsOngoing;
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dispatch_queue_t _serialDispatchQueue;
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// these are permitted for modification on _serialDispatchQueue only
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@ -25,16 +27,18 @@
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if(self = [super init])
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{
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_serialDispatchQueue = dispatch_queue_create("Best Effort Updater", DISPATCH_QUEUE_SERIAL);
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// This is a workaround for assigning the correct initial value within Objective-C's form.
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atomic_flag initialFlagValue = ATOMIC_FLAG_INIT;
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_updateIsOngoing = initialFlagValue;
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}
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return self;
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}
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- (void)update
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{
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const uint32_t processingMask = 0x01;
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// Always post an -openGLView:didUpdateToTime: if a previous one isn't still ongoing. This is the hook upon which the substantial processing occurs.
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if(!OSAtomicTestAndSet(processingMask, &_updateIsOngoing))
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if(!atomic_flag_test_and_set(&_updateIsOngoing))
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{
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dispatch_async(_serialDispatchQueue, ^{
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NSTimeInterval timeInterval = [NSDate timeIntervalSinceReferenceDate];
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@ -52,7 +56,7 @@
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}
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_previousTimeInterval = timeInterval;
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_hasSkipped = NO;
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OSAtomicTestAndClear(processingMask, &_updateIsOngoing);
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atomic_flag_clear(&_updateIsOngoing);
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});
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}
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else
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