Tswitch
Clients for Tswitch
Clients for the F06 Assignment
This is a simple test driver which shows how the
regsave and
regrest transfer control. Notice how the
regrest call transfers
control back to
regsave, and how return values are used to
get different behavior after
regsave returns from different places.
The output is
A: t = 1, rs = 0
B: t = 1
A: t = 14, rs = 1
D: t = 14
A: t = 55, rs = 2
C: t = 55
A: t = -4, rs = 3
E: t = -4
#include <stdio.h>
#include <tswitch.h>
regbuf_t rb;
main()
{
int t = 1;
int rs = regsave(rb);
printf("A: t = %d, rs = %d\n", t, rs);
if(rs == 0) {
printf("B: t = %d\n", t);
t = 14;
regrest(rb, 1);
} else if(rs == 2) {
printf("C: t = %d\n", t);
t = -4;
regrest(rb, 3);
} else if(rs == 1) {
printf("D: t = %d\n", t);
t = 55;
regrest(rb, 2);
}
printf("E: t = %d\n", t);
}
Dr. Bennet
