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Dumped Mach-specific test-and-set in favour of ordinary C11.

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This commit is contained in:
Thomas Harte 2017-04-15 21:41:59 -04:00
parent 4127350abe
commit 92a8b68859
1 changed files with 9 additions and 5 deletions
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14
OSBindings/Mac/Clock Signal/Updater/CSBestEffortUpdater.m
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@ -8,10 +8,12 @@
#import "CSBestEffortUpdater.h"
#include <stdatomic.h>
@implementation CSBestEffortUpdater
{
// these are inherently handled only by thread-safe constructions
uint32_t _updateIsOngoing;
atomic_flag _updateIsOngoing;
dispatch_queue_t _serialDispatchQueue;
// these are permitted for modification on _serialDispatchQueue only
@ -25,16 +27,18 @@
if(self = [super init])
{
_serialDispatchQueue = dispatch_queue_create("Best Effort Updater", DISPATCH_QUEUE_SERIAL);
// This is a workaround for assigning the correct initial value within Objective-C's form.
atomic_flag initialFlagValue = ATOMIC_FLAG_INIT;
_updateIsOngoing = initialFlagValue;
}
return self;
}
- (void)update
{
const uint32_t processingMask = 0x01;
// Always post an -openGLView:didUpdateToTime: if a previous one isn't still ongoing. This is the hook upon which the substantial processing occurs.
if(!OSAtomicTestAndSet(processingMask, &_updateIsOngoing))
if(!atomic_flag_test_and_set(&_updateIsOngoing))
{
dispatch_async(_serialDispatchQueue, ^{
NSTimeInterval timeInterval = [NSDate timeIntervalSinceReferenceDate];
@ -52,7 +56,7 @@
}
_previousTimeInterval = timeInterval;
_hasSkipped = NO;
OSAtomicTestAndClear(processingMask, &_updateIsOngoing);
atomic_flag_clear(&_updateIsOngoing);
});
}
else