Is function "zgtsv_" reentrant ?

[hidingw]

I use CLAPACK-3.1.1-VisualStudio to do some simulation.
I only use the function "zgtsv_" in the code.
When I use multi-thread compulting, I allocate seperate working spaces for different thread.
However, there is an error when running the program: "complex division by zero"

Someone can help me about this problme? 3x.