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スレッドセーフに1回だけ実行させる

Last updated at Posted at 2014-02-08

シングルトンとかで使う感じかな。

+ (HKSQLite *) sharedSQLite
{
	static HKSQLite *_SQLite;
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
		_SQLite = [[HKSQLite alloc] initWithPath:self.path];
		[_SQLite setup];
	});
	return _SQLite;
}
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