线程终止太早

我有一个应用程序可以通过Mac/iPhone的gdata objc客户端上传到谷歌电子表格。它工作得很好。我正在尝试在它自己的线程上获取上载部分,我正在尝试在一个新线程上调用上载方法。

看:

-(void)establishNewThreadToUpload {
    [NSThread detachNewThreadSelector:@selector(uploadToGoogle) toTarget:self withObject:nil];
}

-(void)uploadToGoogle {
    NSAutoReleasePool *pool = [[NSAutoReleasePool alloc] init];
    //works fine
    [helper setNewServiceWithName:username password:password];
    //works fine
    [helper fetchUserSpreadsheetFeed];
    //inside the helper class, fetchUserSpreadsheet feed calls ANOTHER method, which
    //calls ANOTHER METHOD and so on, until the object is either uploaded or fails
    //However, once the class gets to the end of fetchUserSpreadsheetFeed
    //control is passed back to this method, and
    [pool release];
    //is called.  The thread terminates and nothing ever happens.
}

如果我忘记使用一个单独的线程,所有的工作都会像它应该的那样。我是新来的线程编程,所以如果有什么我错过了,请提示我!

谢谢!