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Add ASDispatchAsync and use it in ASCollectionLayout
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// | ||
// ASDispatch.m | ||
// Texture | ||
// | ||
// Copyright (c) 2017-present, Pinterest, Inc. All rights reserved. | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
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#import <AsyncDisplayKit/ASDispatch.h> | ||
#import <stdatomic.h> | ||
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/** | ||
* Like dispatch_apply, but you can set the thread count. 0 means 2*active CPUs. | ||
* | ||
* Note: The actual number of threads may be lower than threadCount, if libdispatch | ||
* decides the system can't handle it. In reality this rarely happens. | ||
*/ | ||
void ASDispatchApply(size_t iterationCount, dispatch_queue_t queue, NSUInteger threadCount, NS_NOESCAPE void(^work)(size_t i)) { | ||
if (threadCount == 0) { | ||
threadCount = NSProcessInfo.processInfo.activeProcessorCount * 2; | ||
} | ||
dispatch_group_t group = dispatch_group_create(); | ||
__block atomic_size_t counter = ATOMIC_VAR_INIT(0); | ||
for (NSUInteger t = 0; t < threadCount; t++) { | ||
dispatch_group_async(group, queue, ^{ | ||
size_t i; | ||
while ((i = atomic_fetch_add(&counter, 1)) < iterationCount) { | ||
work(i); | ||
} | ||
}); | ||
} | ||
dispatch_group_wait(group, DISPATCH_TIME_FOREVER); | ||
}; | ||
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||
/** | ||
* Like dispatch_async, but you can set the thread count. 0 means 2*active CPUs. | ||
* | ||
* Note: The actual number of threads may be lower than threadCount, if libdispatch | ||
* decides the system can't handle it. In reality this rarely happens. | ||
*/ | ||
void ASDispatchAsync(size_t iterationCount, dispatch_queue_t queue, NSUInteger threadCount, NS_NOESCAPE void(^work)(size_t i)) { | ||
if (threadCount == 0) { | ||
threadCount = NSProcessInfo.processInfo.activeProcessorCount * 2; | ||
} | ||
__block atomic_size_t counter = ATOMIC_VAR_INIT(0); | ||
for (NSUInteger t = 0; t < threadCount; t++) { | ||
dispatch_async(queue, ^{ | ||
size_t i; | ||
while ((i = atomic_fetch_add(&counter, 1)) < iterationCount) { | ||
work(i); | ||
} | ||
}); | ||
} | ||
}; | ||
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