@interface ViewController ()
{
//NSLock * lock;
NSCondition * condition;
}
//媒介，缓冲池
@property (nonatomic, strong) NSMutableArray * array;
@end
@implementation ViewController
- (NSMutableArray *)array
{
if (!_array)
{
_array = [NSMutableArray array];
}
return _array;
}
- (void)viewDidLoad {
[super viewDidLoad];
//创建按钮
//初始化
condition = [[NSCondition alloc] init];
UIButton * btn = [UIButton buttonWithType:UIButtonTypeContactAdd];
btn.center = self.view.center;
[self.view addSubview:btn];
[btn addTarget:self action:@selector(_productor) forControlEvents:UIControlEventTouchUpInside];
//生产与购买
//通过多线程访问这两个方法
for (int i = 0; i<5; i++)
{
[self performSelectorInBackground:@selector(_consumer) withObject:nil];
}
}
//生产者
- (void)_productor
{
[condition lock];
[NSThread sleepForTimeInterval:.5];
if (self.array.count != 0)//缓冲池中一般规定只有一个，所以做一个判断，进来之后，什么都不做。
{
// [condition wait];
}
else
{
[self.array addObject:@"产品"];
NSLog(@"产品生产成功");
[condition signal];//随机唤醒一个等待的消费者
//[condition broadcast];
}
[condition unlock];
}
//消费者
- (void)_consumer
{
[condition lock];
if (self.array.count <= 0)
{
NSLog(@"池子没货物,等待生产");
[condition wait];//wait之后，当前线程阻塞，其他线程还可以进来
}
NSLog(@"产品购买成功");
[self.array removeLastObject];
//[condition signal];
[condition unlock];
}