Function nxtask_exit

sched/task/task_exit.c:75–161

 ****************************************************************************/

int nxtask_exit(void)
{
  FAR struct tcb_s *dtcb;
  FAR struct tcb_s *rtcb;
  int ret;
#ifdef CONFIG_SMP
  /* Avoid using this_task() because it may assume a state that is not
   * appropriate for an exiting task.
   */

  dtcb = current_task(this_cpu());
#else
  dtcb = this_task();
#endif

  sinfo("%s pid=%d,TCB=%p\n", get_task_name(dtcb),
        dtcb->pid, dtcb);

  /* Remove the TCB of the current task from the ready-to-run list.  A
   * context switch will definitely be necessary -- that must be done
   * by the architecture-specific logic.
   *
   * nxsched_remove_readytorun will mark the task at the head of the
   * ready-to-run with state == TSTATE_TASK_RUNNING
   */

  nxsched_remove_self(dtcb);

  /* Get the new task at the head of the ready to run list */

#ifdef CONFIG_SMP
  rtcb = current_task(this_cpu());
#else
  rtcb = this_task();
#endif

  /* We are now in a bad state -- the head of the ready to run task list
   * does not correspond to the thread that is running.  Disabling pre-
   * emption on this TCB and marking the new ready-to-run task as not
   * running.
   *
   * We disable pre-emption here by directly incrementing the lockcount
   * (vs. calling sched_lock()).
   */

  rtcb->lockcount++;

  rtcb->task_state = TSTATE_TASK_READYTORUN;

#ifdef CONFIG_SMP
  /* NOTE:
   * During nxtask_terminate(), enter_critical_section() will be called
   * to deallocate tcb. However, this would acquire g_cpu_irqlock if
   * rtcb->irqcount = 0, event though we are in critical section.
   * To prevent from acquiring, increment rtcb->irqcount here.
   */

  rtcb->irqcount++;