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74 lines
1.5 KiB
74 lines
1.5 KiB
/*
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* Copyright (c) 2014 - Facebook.
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* All rights reserved.
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*/
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#import <Foundation/Foundation.h>
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@interface A : NSObject {
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int x;
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}
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@end
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@implementation A
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+ (int)dispatch_once_example
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{ static A* a = nil;
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//dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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a = [[A alloc] init];
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a->x = 10;
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});
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return a->x;
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}
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+ (int)dispatch_async_example
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{ static A* a = nil;
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
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a = [[A alloc] init];
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a->x = 10;
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});
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return a->x;
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}
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+ (int)dispatch_after_example
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{ static A* a = nil;
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)),
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dispatch_get_main_queue(), ^{
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a = [[A alloc] init];
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a->x = 10;
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});
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return a->x;
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}
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+ (int)dispatch_group_example
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{ static A* a = nil;
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dispatch_group_async(NULL, dispatch_get_main_queue(), ^{
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a = [[A alloc] init];
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a->x = 10;
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});
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return a->x;
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}
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+ (int)dispatch_group_notify_example
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{ static A* a = nil;
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dispatch_group_async(NULL, dispatch_get_main_queue(), ^{
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a = [[A alloc] init];
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a->x = 10;
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});
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return a->x;
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}
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+ (int)dispatch_barrier_example
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{ static A* a = nil;
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dispatch_barrier_async(dispatch_get_main_queue(), ^{
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a = [[A alloc] init];
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a->x = 10;
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});
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return a->x;
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}
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@end
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