这里用autoreleasepool的意义是什么

```objc
+ (void)monitorThreadEntryPoint
{
    @autoreleasepool {
        [[NSThread currentThread] setName:@"FluencyMonitor"];
        NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
        [runLoop addPort:[NSMachPort port] forMode:NSDefaultRunLoopMode];
        [runLoop run];
    }
}
```
有哪些对象需要尽快回收？