int main(void *args)
{
int pid1, pid2;
int r;
int arg = 0;
(void)args;
assert(getprio(getpid()) == 128);
pid1 = start("busy1", 4000, 64, (void *) arg);
assert(pid1 > 0);
pid2 = start("busy2", 4000, 64, (void *) pid1);
assert(pid2 > 0);
printf("1 -");
r = chprio(getpid(), 32);
assert(r == 128);
printf(" - 2");
r = kill(pid1);
assert(r == 0);
assert(waitpid(pid1, 0) == pid1);
r = kill(pid2);
assert(r < 0); /* kill d'un processus zombie */
assert(waitpid(pid2, 0) == pid2);
printf(" 3");
r = chprio(getpid(), 128);
assert(r == 32);
printf(" 4.\n");
return 0;
}
procchprio(char c) {
int i;
int count = 0;
while (count++ < LOOP/6) {
kprintf("%c", c);
for (i = 0; i < 10000000; i++);
}
chprio(prB,200);
kprintf("X");
while (count++ < LOOP) {
kprintf("%c", c);
for (i = 0; i < 10000000; i++);
}
}
// Priority Inheritance chprio test
void pinh_chprio_test() {
int lck;
int rd1;
int wr1, wr2;
int lp;
kprintf("\nBasic Priority chprio Test\n"
"Once looper process is started readers/writers will be\n"
"starved until chprio() is used to change prio of reader C\n"
"(currently waiting on lock) to 30\n"
" lock acquisition is:\n"
"writer A\n"
"writer B\n"
"reader C\n");
lck = lcreate();
// Create a process that is always ready to run at priority 15
lp = create(looper, 2000, 15, "looper", 0, NULL);
wr1 = create(writer, 2000, 10, "writer", 4, "writer A p10 l20", lck, 20, 5);
wr2 = create(writer, 2000, 11, "writer", 4, "writer B p11 l30", lck, 30, 2);
rd1 = create(reader, 2000, 12, "reader", 4, "reader C p12 l20", lck, 20, 1);
kprintf("-start writer A (pprio 10, lprio 20), then sleep 1s.\n");
resume(wr1);
sleep(1);
kprintf("-start writer B (pprio 11, lprio 30), then sleep 1s.\n");
resume(wr2);
sleep(1);
kprintf("-start reader C (pprio 12, lprio 20), then sleep 1s.\n");
resume(rd1);
sleep(1);
// This will guarantee that writer B will never get chosen unless
// we boost its priority.
kprintf("-start looper process (pprio 15), then sleep 8s.\n");
resume(lp);
sleep(8);
//chprio
kprintf("-chprio of reader C to 30 --> All readers/writers will have effective priority 30.\n");
chprio(rd1, 30);
sleep (10);
kprintf ("Test finished, verify readers/writers were hung until chprio!\n");
}
