updated alarmtest

This commit is contained in:
Robert Morris 2019-10-03 15:02:19 -04:00
parent 78f863f8ae
commit 56583b1402
6 changed files with 32 additions and 25 deletions

View file

@ -21,7 +21,7 @@ main(int argc, char *argv[])
{
test0();
test1();
exit();
exit(0);
}
volatile static int count;
@ -44,7 +44,7 @@ test0()
count = 0;
sigalarm(2, periodic);
for(i = 0; i < 1000*500000; i++){
if((i % 250000) == 0)
if((i % 1000000) == 0)
write(2, ".", 1);
if(count > 0)
break;
@ -53,7 +53,7 @@ test0()
if(count > 0){
printf("test0 passed\n");
} else {
printf("test0 failed\n");
printf("\ntest0 failed: the kernel never called the alarm handler\n");
}
}
@ -64,6 +64,14 @@ void __attribute__ ((noinline)) foo(int i, int *j) {
*j += 1;
}
//
// tests that the kernel calls the handler multiple times.
//
// tests that, when the handler returns, it returns to
// the point in the program where the timer interrupt
// occurred, with all registers holding the same values they
// held when the interrupt occurred.
//
void
test1()
{
@ -79,9 +87,19 @@ test1()
break;
foo(i, &j);
}
if(i != j || count < 10){
// i should equal j
printf("test1 failed\n");
if(count < 10){
printf("\ntest1 failed: too few calls to the handler\n");
exit(1);
} else if(i != j){
// the loop should have called foo() i times, and foo() should
// have incremented j once per call, so j should equal i.
// once possible source of errors is that the handler may
// return somewhere other than where the timer interrupt
// occurred; another is that that registers may not be
// restored correctly, causing i or j or the address ofj
// to get an incorrect value.
printf("\ntest1 failed: foo() executed fewer times than it was called\n");
exit(1);
} else {
printf("test1 passed\n");
}