1 #import "AppDelegate.h"
2
3 @interface AppDelegate ()
4
5 @end
6
7 @implementation AppDelegate
8
9 -(void)dealloc{
10
11 [_window release];
12 [super dealloc];
13 }
14
15
16 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
17 self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
18 self.window.backgroundColor = [UIColor blackColor];
19
20 [self.window makeKeyAndVisible];
21
22 [_window release];
23
24 //线程互斥 线程没有自己独立的栈堆空间，都是使用进程内部的内存空间，所以有可能多个线程同时访问同一块内存，这时就会出问题，针对多线程访问共享资源是就会采用线程互斥方式，加线程锁
25 NSLock *lk = [[NSLock alloc]init];
26
27 NSThread *thread1 = [[NSThread alloc]initWithTarget:self selector:@selector(therad:) object:lk];
28
29 thread1.name = @"1号窗口";
30
31 [thread1 start];
32
33
34
35 NSThread *therad2 = [[NSThread alloc]initWithTarget:self selector:@selector(therad:) object:lk];
36
37 therad2.name = @"2号窗口" ;
38
39 // therad2.threadPriority = 0.9 ;
40
41 [therad2 start];
42
43
44
45 NSThread *therad3 = [[NSThread alloc]initWithTarget:self selector:@selector(therad:) object:lk];
46
47 therad3.name = @"3号窗口" ;
48
49 therad3.threadPriority = 1 ;
50
51 [therad3 start];
52
53
54
55
56
57
58 return YES;
59 }
60
61
62 //模拟售票
63 -(void)therad:(id)object{
64
65 NSLock *lk = (NSLock *)object ;
66
67 //票数100张
68 static int number = 100 ;
69
70 while (1) {
71
72 // 加线程锁，提高数据访问的安全性
73 [lk lock];
74
75 number -- ;
76
77 NSLog(@"%@ %d",[[NSThread currentThread]name],number);
78
79 //休眠1秒
80 sleep(1);
81
82 if (number == 0) {
83 break ;
84 }
85
86 [lk unlock] ;
87 }
88
89 }
