對象沒有池自動釋放到位

Question

我使用XCode4下列代碼上的多線程工作：

#import <Foundation/Foundation.h> 

bool trigger = false; 
NSLock *theLock=[NSLock new]; 

@interface Metronome : NSObject 
+(void)tick:(id)param; 
@end 

@implementation Metronome 
+(void)tick:(id)param{ 
while(1) 
    { 
      NSLog(@"TICK\n"); 
      usleep(1000000); 
      [theLock lock]; 
      trigger = true; 
      [theLock unlock]; 
    } 
} 
@end 

int main() 
{ 
    [NSThread detachNewThreadSelector:@selector(tick:) 
toTarget:[Metronome class] withObject:nil]; 
} 

沒有編譯錯誤，但在執行過程中控制檯彈出如下警告：

objc[688]: Object 0x100300ff0 of class NSThread autoreleased with no pool 
in place - just leaking - break on objc_autoreleaseNoPool() to debug 

我不熟悉obj-C的內存管理。誰可以給我解釋一下這個？非常感謝！

Answer 1

你必須創建爲每個線程NSAutoreleasePool需要調用autorelease包括主線程

int main() 
{ 
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 
    [NSThread detachNewThreadSelector:@selector(tick:) 
toTarget:[Metronome class] withObject:nil]; 
    [pool release]; 
} 

Answer 2

你需要一個線程池。

-(void)someMethod { 
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 

    //code that should be run in the new thread goes here 

    [pool release]; 
} 

你也可以考慮使用弧。 http://longweekendmobile.com/2011/09/07/objc-automatic-reference-counting-in-xcode-explained/