Hi,

I have a code that alternates between 2 funcs unlimitedly. I am curious 
to know the following lines in switch_to() as to what it does
if(!called_once[1] && func==1) {
       asm("movl %0,%%esp\n\t"\
          : "=m"(func_stack));
         called_once[func]=1;

Also, can anyone give me a suggestion as to what needs to be done for 
getting this sequence

main to A;
A to main; /* jump back to main without finishing A */
main to B;
B to main; /* jump back to main without finishing A */
main to A; /* without calling A */
....
....

Thanks
Prasanta