int main(int argc, char *argv[])
{
pid_t pid1, pid2, pidx, pidy;
int status;
pid1 = fork();
if (pid1 < 0)
{ printf("Fork 1 failed\n");
}
else if (pid1 == 0)
{ /* TASK 1 */
printf("Task 1 starting\n");
worry(argc+5);
printf("Task 1 has had %d seconds\n", argc+5);
exit(0);
}
else
{ printf("Task 1 has pid %d\n", pid1);
pid2 = fork();
if (pid2 < 0)
{ printf("Fork 2 failed\n");
kill(pid1, SIGKILL);
waitpid(pid1, &status, 0);
printf("Task 1 killed\n");
}
else if (pid2 == 0)
{ /* TASK 2 */
printf("Task 2 starting\n");
worry(7);
printf("Task 2 has had 7 seconds\n");
exit(0);
}
else
{ printf("Task 2 has pid %d\n", pid2);
pidx = wait(&status);
printf("First signal was from task %d\n", pidx);
if (!WIFEXITED(status))
{ printf("Task did not exit cleanly\n");
kill(pid1, SIGKILL);
kill(pid2, SIGKILL);
waitpid(pid1, &status, 0);
waitpid(pid2, &status, 0);
printf("Both tasks now dead\n");
}
pidy = pidx == pid1 ? pid2 : pid1;
kill(pidy, SIGKILL);
waitpid(pidy, &status, 0);
printf("Other task (%d) now dead\n", pidy);
}
}
printf("All done\n");
return 0;
}
/* Unmask an IRQ
* Parameters:
* irq - the IRQ number (NOT the raw interrupt number)
*
* Returns:
* true if IRQ was unmasked, false if it was already unmasked
*/
bool int_unmask_irq(uint8_t irq)
{
KASSERT(VALID_IRQ(irq));
KASSERT(irq != 2);
uint16_t irq_bit = 1 << irq;
// Check if the IRQ is already unmasked
if (!(irq_mask & irq_bit))
{
char buf[40];
sprintf(buf, "masking already masked IRQ %u\n", irq);
worry(buf);
return false;
}
set_raw_mask(irq_mask & ~irq_bit);
return true;
}
