#import "ViewController.h"@interface ViewController ()/// 销售员01@property (strong, nonatomic) NSThread *thread01;/// 销售员02@property (strong, nonatomic) NSThread *thread02;/// 销售员03@property (strong, nonatomic) NSThread *thread03;/// 票的总数@property (assign, nonatomic) NSInteger ticketCount;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.ticketCount = 100;        self.thread01 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:nil];    self.thread01.name = @"销售员01";    self.thread02 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:nil];    self.thread02.name = @"销售员02";    self.thread03 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:nil];    self.thread03.name = @"销售员03";}- (void)touchesBegan:(NSSet
    
      *)touches withEvent:(UIEvent *)event {    [self.thread01 start];    [self.thread02 start];    [self.thread03 start];}- (void)saleTicket{    while (1) {        @synchronized(self) {            // 取出总数            NSInteger count = self.ticketCount;            if (count > 0) {                self.ticketCount = count -1;                NSLog(@"%@卖了一张，还剩下%zd张",[NSThread currentThread],self.ticketCount);            } else {                NSLog(@"票已经卖完了");                break;            }        }    }}@end