Function _exit

sched/task/exit.c:56–100

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

void _exit(int status)
{
  FAR struct tcb_s *tcb = this_task();

  /* Only the lower 8-bits of status are used */

  status &= 0xff;

#ifdef HAVE_GROUP_MEMBERS
  /* Kill all of the children of the group, preserving only this thread.
   * exit() is normally called from the main thread of the task.  pthreads
   * exit through a different mechanism.
   */

  if ((tcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_KERNEL)
    {
      group_kill_children(tcb);
    }

#endif

  /* Make sure that we are in a critical section with local interrupts.
   * The IRQ state will be restored when the next task is started.
   */

  enter_critical_section();

  /* Perform common task termination logic.  This will get called again later
   * through logic kicked off by up_exit().
   *
   * REVISIT: Tt should not be necessary to call this here, but releasing the
   * task group (especially the group file list) requires that it is done
   * here.
   *
   * The reason? up_exit removes the current process from the ready-to-run
   * list and trying to execute code that depends on this_task() crashes at
   * once, or does something very naughty.
   */

  tcb->flags |= TCB_FLAG_EXIT_PROCESSING;

  nxtask_exithook(tcb, status);

  up_exit(status);
}