Modify select_next_thread() in thread.c to handle THREAD_INTENTION_EX…

[yeonjjeong]

127

Modify select_next_thread() in thread.c to handle THREAD_INTENTION_EXITED & THREAD_INTENTION_BLOCKED. This will fix Exception error and Not finishing when AIM7 runs with IO offload

THREAD_INTENTION_EXITED

• change the condition to call the idle thread and add tcb_unlock() which is omitted. From: if (get_current()->id == next_tcb->id) { refill_time_slice(g_idle_thread_list[cid]);

  return g_idle_thread_list[cid];

  } To: if (per_cpu(runnable_list).count == 1) { refill_time_slice(g_idle_thread_list[cid]);

  tcb_unlock(next_tcb);
  return g_idle_thread_list[cid];

  }

• delete the codes which remove tcb from runnable_list and destroy tcb. the codes already exists in __post_context_switch()

THREAD_INTENTION_BLOCKED

• add the condition to call the idle thread and remove the codes which tcb from runnable_list and add it to blocked_list.

[seungjunn]

The fix has no direct effect on errors, Rather, another error may occur when exiting one's own thread.