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???????????? ???????[ 2012/10/24 10:37:01 ] ????????

???????????????????????????????????????????????????????????????????檔????????????chg_pri_mutex???????????????change_interal_task_priority??????ж???????????????????????ж???ζ????????????????????????????????????????????????????

RAW_U8 chg_pri_mutex(RAW_TASK_OBJ *tcb?? RAW_U8 priority?? RAW_U16 *error)
{
RAW_MUTEX *mtxcb;
RAW_U8 hi_pri?? low_pri?? pri;
RAW_TASK_OBJ *first_block_task;
LIST *block_list_head;

hi_pri = priority;
low_pri = 0;

mtxcb = (RAW_MUTEX *)(tcb->block_obj);

if (mtxcb) {

/*if it is blocked on mutex*/
if (mtxcb->common_block_obj.object_type == RAW_MUTEX_OBJ_TYPE) {

   if (mtxcb->policy == RAW_MUTEX_CEILING_POLICY) {
    pri = mtxcb->ceiling_prio;

    if (pri > low_pri) {
     low_pri = pri;
    }
   }
}
}

/* Locked Mutex */
pri = hi_pri;
for (mtxcb = tcb->mtxlist; mtxcb != 0; mtxcb = mtxcb->mtxlist) {
switch (mtxcb->policy) {

    case RAW_MUTEX_CEILING_POLICY:
   pri = mtxcb->ceiling_prio;
   if ( pri > low_pri ) {
    low_pri = pri;
   }
   break;

    case RAW_MUTEX_INHERIT_POLICY:

   block_list_head = &mtxcb->common_block_obj.block_list;

   if (!is_list_empty(block_list_head)) {
    first_block_task = list_entry(block_list_head->next?? RAW_TASK_OBJ?? task_list);
    pri = first_block_task->priority;
   }

   break;

    default:
   /* nothing to do */
   break;
}
if ( pri < hi_pri ) {
   hi_pri = pri;
}
}