NSCondition模拟买票的过程的简单实现

@interface ViewController ()

@property (nonatomic, strong) NSMutableArray * array;

@property (nonatomic, strong) NSCondition * condition;

@property (nonatomic, strong) NSTimer * timer;

@end


@implementation ViewController

//初始化

- (NSMutableArray *)array

{

    if (!_array) {

        _array = [NSMutableArray array];

    }

    return _array;

}


- (NSCondition *)condition

{

    if (!_condition) {

        _condition = [[NSCondition alloc] init];

    }

    return  _condition;

}


//加载

- (void)viewDidLoad {

    [super viewDidLoad];

    

    //购买

    for (int i = 0; i<3; i++)

    {

        [self performSelectorInBackground:@selector(_consumer) withObject:nil];

    }

    

    //生产

    self.timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(_productor) userInfo:nil repeats:YES];

    

}


- (void)_productor

{

    [self.condition lock];

    

    if (self.array.count != 0)

    {

        NSLog(@"结束");

        [self.timer invalidate];

        self.timer = nil;

    }

    else

    {

        [self.array addObject:@"aaa"];

        NSLog(@"生产完成！");

        [self.condition signal];

    }

    

    [self.condition unlock];

    

    

}



- (void)_consumer

{

    [self.condition lock];

    

    if (self.array.count <= 0)

    {

        NSLog(@"正在等待！");

        [self.condition wait];

    }

    

    [self.array removeLastObject];

    NSLog(@"购买成功！");

    

    [self.condition unlock];

}



@end

标签：

版权申明：本站文章部分自网络，如有侵权，请联系：west999com@outlook.com
特别注意：本站所有转载文章言论不代表本站观点！
本站所提供的图片等素材，版权归原作者所有，如需使用，请与原作者联系。