Can it write a text file in a MC_CTHREAD?

Hi,

I write to a text file in a MC_CTHREAD. I find that it can write before an IO write method and wait(). Then, nothing is written to the file any more.

I do not know where this is written on the manual. Could you explain it to me?

I attach the text file in this post. In this file, the MC_CTHREAD function can write "shift[0000000000]" to the text file while it cannot write "shift[0]" to the text file. Is there some rule about this?

Thanks,