#import "ViewController.h"
#import <pthread.h>
@interface ViewController ()
@property (nonatomic, strong) NSCondition *lock;
@property (nonatomic, strong) NSMutableArray *data;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.lock = [[NSCondition alloc]init];
self.data = [NSMutableArray array];
[self test];
// Do any additional setup after loading the view.
}
//同时执行 删除 添加操作
-(void)test{
[[[NSThread alloc]initWithTarget:self selector:@selector(add) object:nil] start];
[[[NSThread alloc]initWithTarget:self selector:@selector(remove) object:nil] start];
}
-(void)add{
sleep(1);
[self.lock lock];
[self.data addObject:@"A"];
NSLog(@"添加数据");
//发送信号通知条件能继续往下执行
[self.lock signal];
//广播信号 对应的条件能往下继续执行了
// [self.lock broadcast];
[self.lock unlock];
}
-(void)remove{
NSLog(@"开始删除数据");
[self.lock lock];
if (self.data.count==0) {
//这时候会等待条件、并且打开当前锁、
//收到条件信号之后会重新加锁并执行后面的代码
[self.lock wait];
}
[self.data removeLastObject];
[self.lock unlock];
NSLog(@"删除数据");
}
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic, strong) NSConditionLock *lock;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.lock=[[NSConditionLock alloc]initWithCondition:1];
[[[NSThread alloc]initWithTarget:self selector:@selector(one) object:nil] start];
[[[NSThread alloc]initWithTarget:self selector:@selector(two) object:nil] start];
[[[NSThread alloc]initWithTarget:self selector:@selector(three) object:nil] start];
// Do any additional setup after loading the view.
}
-(void)one{
//条件依赖，当满足Condition为1时才会解锁 否 则会等待条件满足时进行加锁
[self.lock lockWhenCondition:1];
NSLog(@"one");
[self.lock unlockWithCondition:2];
}
-(void)two{
[self.lock lockWhenCondition:2];
NSLog(@"two");
[self.lock unlockWithCondition:3];
}
-(void)three{
[self.lock lockWhenCondition:3];
NSLog(@"three");
[self.lock unlock];
}
@end
