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thread_loop_c 获取subthread层的值似乎有点问题，见https://muchong.com/html/201211/5150612_2.html，最好是用mp_thread_loop_c，配合**pt和C_VOF(c, pt[0])来进行取值。
@gemini 谢谢。刚刚试了您的方法，解决了！
