iOS 線程間共用資源添加排它鎖

標籤：

#import "ViewController.h"

@interface ViewController ()

@property(nonatomic,strong)NSThread *thread1;

@property(nonatomic,strong)NSThread *thread2;

@property(nonatomic,strong)NSThread *thread3;

//剩餘票

@property(nonatomic,assign)NSInteger leftTickets;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.leftTickets=100;//總票數

    

    // 初始化三個賣票視窗

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

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

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

    

}

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

{

    //開始買票

    [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(@"餘票:%ld,買票的進程:%@",self.leftTickets,[NSThread currentThread]);

            }

            else

            {

                return;

            }

        }

    }

}

iOS 線程間共用資源添加排它鎖