Проблема с NSThread

У меня есть проблема с моим кодом, я хочу создать 2 других экземпляра с NSThread, но я думаю в своей проблеме, их не происходит. Можно ли взять мой решение для моей проблемы. Я отправляю свой код, если Вы можете, можно ли показать пример решения?Спасибо

@implementation myClass


-(void)detectMove:(NSNumber*)arrayIndex{

    NSMutableDictionary *myDictionary = [[NSMutableDictionary alloc] init];  
    [myDictionary setObject:arrayIndex forKey:@"arrayIndex"];  

    identificationMove *identifier = [[identificationMove alloc]init];
    [identifier setArrayIndex:(NSNumber*)arrayIndex];
    [identifier detectionMove];

    [identifier release];

}


-(void)callDectectionMove:(NSNumber*)arrayIndex{

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];  

    [self performSelectorOnMainThread:@selector(detectMove:) withObject:(NSNumber*)arrayIndex waitUntilDone:NO];  

    [pool release];
}


-(void)detectPositionMovement{


    for(int i = 0; i< [self.arrayMovement count]; i++){

        if((actualAccelerometerX+sensibilityMovement) > [[[[self.arrayMovement      objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueX] && (actualAccelerometerX-sensibilityMovement) < [[[[self.arrayMovement      objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueX] &&
           (actualAccelerometerY+sensibilityMovement) > [[[[self.arrayMovement      objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueY] && (actualAccelerometerY-sensibilityMovement) < [[[[self.arrayMovement      objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueY] &&
           (actualAccelerometerZ+sensibilityMovement) > [[[[self.arrayMovement      objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueZ] && (actualAccelerometerZ-sensibilityMovement) < [[[[self.arrayMovement      objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueZ])

                    //I'm not sure that these istruction can start a 2 different and indipendent thread
            [NSThread detachNewThreadSelector:@selector(callDectectionMove:) toTarget:self withObject:[NSNumber numberWithInt:(int)i]];  

        }
}

@end