//  DYFViewController.m//  623-05-线程同步问题////  Created by dyf on 14-6-23.//  Copyright (c) 2014年 ___FULLUSERNAME___. All rights reserved.//#import "DYFViewController.h"@interface DYFViewController ()@property (nonatomic, assign) int leftCount;@property (nonatomic, strong) NSThread *thread0;@property (nonatomic, strong) NSThread *thread1;@property (nonatomic, strong) NSThread *thread2;@end@implementation DYFViewController- (void)viewDidLoad{    [super viewDidLoad];	// Do any additional setup after loading the view, typically from a nib.        // 默认有100张    self.leftCount = 100;    // 开启多条线程同时卖票    self.thread0 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:@"000"];    self.thread0.name = @"0000";    // 优先级    self.thread0.threadPriority = 1.0;        self.thread1 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:@"000"];    self.thread1.name = @"1111";    self.thread1.threadPriority = 0.0;        self.thread2 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:@"000"];    self.thread2.name = @"2222";    self.thread2.threadPriority = 0.0;        }/** *  卖票 */- (void)saleTicket{//    NSLock *lock = [[NSLock alloc] init];//    lock.tryLock//    lock.lock        while (1) {            @synchronized(self){ // 开始枷锁                // 1.先检查票数        int count = [self leftCount];        if (count > 0) {            // 票数 - 1            [self setLeftCount:(count - 1)];            // 暂停            [NSThread sleepForTimeInterval:0.0004];            NSThread *currentT = [NSThread currentThread];            NSLog(@"%@,-------%d", currentT.name, self.leftCount);        }else        {            // 退出线程            [NSThread exit];        }        } // 解锁    }}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    [self.thread0 start];    [self.thread1 start];    [self.thread2 start];}@end