在类中，进行编辑下面的代码：

nslog(@main thread begin...);

[self performselectorinbackground:@selector(dosomething:) withobject:nil];

nslog(@main thread end.....);

- (void) dosomething:(id)sender

{

nslog( @one thread begin... );

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

for (int i=0; i<self.starname_final.count; i++) {

[self savetodatabase:[starname_final objectatindex:i]];

}

nslog( @one thread end... );

[pool release];

}

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