iOS 线程间共享资源添加排它锁

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#import "ViewController.h"

@interface ViewController ()

@property(nonatomic,strong)NSThread *thread1;

@property(nonatomic,strong)NSThread *thread2;

@property(nonatomic,strong)NSThread *thread3;

//剩余票

@property(nonatomic,assign)NSInteger leftTickets;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.leftTickets=100;//总票数

    // 初始化三个卖票窗口

    self.thread1 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTickets:) object:@"1号窗口"];

    self.thread2 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTickets:) object:@"2号窗口"];

    self.thread3 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTickets:) object:@"3号窗口"];

}

-(void)touchesBegan:(NSSet *)touches withEvent:( UIEvent *)event

{

    //开始买票

    [self.thread1 start];

    [self.thread2 start];

    [self.thread3 start];

}

-(void)saleTickets:(NSString*)str

{

    while (1) {

        @synchronized(self) {

            [NSThread sleepForTimeInterval:0.5];

            if(self.leftTickets>0)

            {

                self.leftTickets--;

                NSLog(@"余票:%ld,买票的进程:%@",self.leftTickets,[NSThread currentThread]);

            }

            else

            {

                return;

            }

        }

    }

}

iOS 线程间共享资源添加排它锁

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原文地址：http://www.cnblogs.com/tangranyang/p/4713672.html