NSLock为什么不能锁住
#import <Foundation/Foundation.h>
@interface MainUI : NSObject
{
NSLock* _lock;
}
-(void)initialize;
@property(nonatomic, retain) NSLock* _enterEmShopLock;
@property(atomic, assign) volatile BOOL _bEnterEmShop;
@end
#import "MainUI.h"
@implementation MainUI
@synthesize _bEnterEmShop=bEnterEmShop;
@synthesize _enterEmShopLock=enterEmShopLock;
-(void)initialize
{
[NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:nil];
[NSThread mainThread].name = @"Main";
NSLog(@"main thread name is %@", [[NSThread mainThread]name]);
bEnterEmShop = YES;
[enterEmShopLock lock];
NSLog(@"cur thread name is %@ and enter lock", [[NSThread currentThread]name]);
[NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:2]];
NSLog(@"cur thread name is %@ and exit unlock", [[NSThread currentThread]name]);
[enterEmShopLock unlock];
}
-(void)run:(MainUI*)mainUI
{
[NSThread currentThread].name = @"Sub";
if(!mainUI._bEnterEmShop)
{
NSLog(@"cur thread name is %@", [[NSThread currentThread]name]);
[[mainUI _enterEmShopLock]lock];
NSLog(@"cur thread name is %@ and enter lock", [[NSThread currentThread]name]);
[NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:2]];
NSLog(@"cur thread name is %@ and exit unlock", [[NSThread currentThread]name]);
[[mainUI _enterEmShopLock]unlock];
}
else {
NSLog(@"cur thread name is %@ and can't be allowed to do anything", [[NSThread currentThread]name]);
}
}
@end
出现的结果：
2013-10-13 16:50:41.368 ThreadSynPrj[18231:f803] main thread name is Main
2013-10-13 16:50:41.368 ThreadSynPrj[18231:1290b] cur thread name is Sub
2013-10-13 16:50:41.370 ThreadSynPrj[18231:f803] cur thread name is Main and enter lock
2013-10-13 16:50:41.370 ThreadSynPrj[18231:1290b] cur thread name is Sub and enter lock
2013-10-13 16:50:43.372 ThreadSynPrj[18231:f803] cur thread name is Main and exit unlock
2013-10-13 16:50:43.372 ThreadSynPrj[18231:1290b] cur thread name is Sub and exit unlock
为什么主线程没有退出，子线程又进来了？NSLock不是互斥锁嘛？
请高手指导，谢谢！ NSLock ios同步 多线程 锁 --------------------编程问答--------------------
[NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:self];
[NSThread mainThread].name = @"Main";
NSLog(@"main thread name is %@", [[NSThread mainThread]name]);
bEnterEmShop = YES;
enterEmShopLock = [[NSLock alloc]init];
[enterEmShopLock lock];
NSLog(@"cur thread name is %@ and enter lock", [[NSThread currentThread]name]);
[NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:2]];
NSLog(@"cur thread name is %@ and exit unlock", [[NSThread currentThread]name]);
[enterEmShopLock unlock];
头文件忘记初始化了，不过这样也还是不行，还是会出现上述问题，不知道什么原因！ --------------------编程问答-------------------- 原来是我自己写错了，在启动子线程的时候，detachNewThreadSelector 是立即启动，这个时候我的初始化放在他的后面，这样当执行子线程的时候，就是未初始化的数据。
补充：移动开发 , iPhone
