How to suppress the debug info from zthread

[xdwjack]

Hi All,
When I was trying to practice multithread programming using zthread, I always got the output mixed with a lot of debug info like "1 user-thread added"(shown below). Is it possible for me to get output purely by myself?

1 user-thread added.
Thread starting...
LiftOff!
Thread joining...
##Thread exiting...
2insertPendingThread()
1 pending-thread added.
:Waiting for LiftOff##1
1Thread joining...
## ##completedThread exiting...

Thank you very much!
Cheers,
Dongwei