using setjmp

[JS]

When setjmp is called how can the if statement evaluate to true or false
when setjmp only returns 0 or non-zero?
struct pcb {
void *(*start_routin e) (void *);
void *arg;
jmp_buf state;
int stack[1024];
};
struct pcb *pcb_pointer;
pcb_pointer = (struct pcb *) malloc(sizeof(s truct pcb));
if(setjmp(pcb_p ointer->state)) {
current->start_routine( current->arg);
printf("Thread returned\n");
exit(0);
}

[pete]

Mark Odell wrote:

Ben Pfaff wrote:

Mark Odell <od*******@hotm ail.com> writes:

I have found that 0 (zero) and !0 (not zero) work well for false and
true checking.

I have found that 1 works well as !0.

Yeah but that breaks my "no numbers except zero" rule. :-) Besides,
sometimes 1 looks like l (ell).

ITYM == 0 and != 0 work well for false and true checking.

--
pete