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33 lines
999 B
Objective-C
33 lines
999 B
Objective-C
//
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// ASDispatch.h
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// AsyncDisplayKit
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//
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// Created by Adlai Holler on 8/25/16.
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// Copyright © 2016 Facebook. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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/**
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* Like dispatch_apply, but you can set the thread count. 0 means 2*active CPUs.
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*
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* Note: The actual number of threads may be lower than threadCount, if libdispatch
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* decides the system can't handle it. In reality this rarely happens.
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*/
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static void ASDispatchApply(size_t iterationCount, dispatch_queue_t queue, NSUInteger threadCount, void(^work)(size_t i)) {
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if (threadCount == 0) {
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threadCount = [NSProcessInfo processInfo].activeProcessorCount * 2;
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}
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dispatch_group_t group = dispatch_group_create();
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__block size_t trueI = 0;
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for (NSUInteger t = 0; t < threadCount; t++) {
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dispatch_group_async(group, queue, ^{
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size_t i;
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while ((i = __sync_fetch_and_add(&trueI, 1)) < iterationCount) {
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work(i);
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}
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});
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}
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dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
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};
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