Objective-C NSThread引用计数约定(保留vs自动释放)

// alloc autorelease pool somewhere before
NSArray *blah = [NSArray arrayWithObject: @"moo"];
[self performSelectorOnMainThread: @selector(boonk:) withObject: blah
      waitUntilDone: NO];
// release autorelease pool somewhere after

现在,这似乎对我来说是错误的,因为自动释放池可以在选择器boonk：完成执行之前释放,这会导致崩溃.

所以,我接下来的自然行动将是：

// alloc autorelease pool somewhere before
NSArray *blah = [[NSArray alloc] initWithObject: @"moo"];
[self performSelectorOnMainThread: @selector(boonk:) withObject: blah
      waitUntilDone: NO];
// release autorelease pool somewhere after


- (void)boonk: (id)data
{
   // do something with data
   [data release];   // release the ref count the thread added
}

这绝对没有错误,但……似乎不自然.是否有一个objective-c引用计数约定或协议来处理这种情况(交叉线程等待发布),或者是第二种解决方案,它的工作方式是什么？