chenBright opened a new pull request, #2520:

   ### What problem does this PR solve?
   Issue Number:
   Problem Summary: 
   目前`get_leaky_singleton`是基于pthread_once实现的,也存在#2517 提到的死锁问题。
   ### What is changed and the side effects?
   1. 支持bthread_once。
   2. 基于bthread_once实现bthread singleton,解决死锁问题。
   Side effects:
   - Performance effects(性能影响):
   - Breaking backward compatibility(向后兼容性): 
   ### Check List:
   - Please make sure your changes are compilable(请确保你的更改可以通过编译).
   - When providing us with a new feature, it is best to add related 
tests(如果你向我们增加一个新的功能, 请添加相关测试).
   - Please follow [Contributor Covenant Code of 

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