communicate between c and IDL

Dear groups,

I am a new comer in IDL,  and I have a question during developing my
program. For example , I sent a 2-d array from IDL to c function ,did
some calculation and then got the result back.It woks if the size
array is small. And I wonder that is there a limit memory size for the
communication between IDL and C, just like the stack used in C is
limited , if you create an array exceed the limit, segmentation fault
will occur.If there is limit in IDL, what about the size? If anyone
can help me , please accept my great appreciate.

Thanks in advance.