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Add ASDispatchAsync and use it in ASCollectionLayout
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| // | ||
| // 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 | ||
| // | ||
|
|
||
| #import <AsyncDisplayKit/ASDispatch.h> | ||
| #import <stdatomic.h> | ||
|
|
||
| /** | ||
| * 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); | ||
| }; | ||
|
|
||
| /** | ||
| * 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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