while loop memory problem - iphone

Question

The problem with this code is that when the while loop is executing, the memory usage is increasing continuously. I want to know why does this code keeps on increasing memory when its in while loop.
Which object here is eating the memory. What can i do so that the memory does not increase in the loop.
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSNumber *totalTime = [[self nowPlayingItem] valueForProperty:MPMediaItemPropertyPlaybackDuration];
while (self.currentPlaybackTime < [totalTime floatValue])
{
NSNumber *currentTime = [[NSNumber alloc] initWithFloat:self.currentPlaybackTime];
if([[NSThread currentThread] isCancelled])
{
[NSThread exit];
[newThread release];
}
else if([totalTime intValue] - [currentTime intValue] == 1.0)
{
if(currentTime)
[currentTime release];
break;
}
[currentTime release];
}
[pool release]

Answer 1

That is some inefficient code you have there.... Heres a replacement that doesn't go mental allocating memory for no reason, further more you might want to put a sleep in there so it doesn't eat CPU
// not needed any more
//NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int totalTime = [[[self nowPlayingItem] valueForProperty:MPMediaItemPropertyPlaybackDuration] intValue];
while (self.currentPlaybackTime < totalTime)
{
//not needed any more
//NSNumber *currentTime = [[NSNumber alloc] initWithFloat:self.currentPlaybackTime];
if([[NSThread currentThread] isCancelled])
{
[NSThread exit];
[newThread release];
}
else if((totalTime - self.currentPlaybackTime) <= 1.0) // you may never hit 1
{
break;
}
}
//[pool release]

Answer 2

I have solved this problem. Replaced the while loop with Timer and made few changes.
Created a timer which fires every second
timer = [NSTimer timerWithTimeInterval:1
target:self
selector:#selector(performAction)
userInfo:nil
repeats:YES];
then in performAction, check for the current playback time and invalidate the timer it the difference in time is <= 1 sec
int totalTime = [[[self nowPlayingItem] valueForProperty:MPMediaItemPropertyPlaybackDuration] intValue];
if((totalTime - self.currentPlaybackTime) <= 1.0)
{
if(timer)
[timer invalidate];
/* Performed my desired action here.... */
}