pid_t
sys_waitpid(pid_t pid, int * status, int options, int *retval){
int result = valid_pid(pid);
if(result){
return result;
}
//If there is an option attached, FAIL. NO OPTIONS FOR YOU
else if(options != 0){
return EINVAL;
}
//If pointer is not aligned, throw an error. NO EXIT CODE FOR YOU
else if((int)status%4 != 0){
return EFAULT;
}
acquire_lock(pid);
//While the process has not exited yet,
while(has_exit_code(pid) == false){
put_to_sleep(pid);
}
*status = _MKWAIT_EXIT(get_exit_code(pid));
release_lock(pid);
release_pid(pid);
*retval = pid;
return 0;
}
void
process_destroy(pid_t pid)
{
bool manageLock = processtable_biglock_do_i_hold();
if(manageLock == false)
{
processtable_biglock_acquire();
}
KASSERT(processtable_biglock_do_i_hold());
struct process *process = get_process(pid);
release_pid(pid);
kfree(process->p_name);
// lock_destroy(process->p_waitlock);
sem_destroy(process->p_waitsem);
// sem_destroy(process->p_forksem);
// cv_destroy(process->p_waitcv);
//processlist_cleanup(&process->p_waiters);
kfree(process);
int num = (int) pid;
processtable[num] = NULL;
parentprocesslist[pid] = -1;
if(manageLock == false)
{
processtable_biglock_release();
}
// kprintf("Cleaning process%d\n",pid);
}