??????????????????????????????

???????????? ???????[ 2012/9/18 10:19:11 ] ????????

??????δ??????????????????????β??????????????δ???????????????????????????????????????????????????rawos?汾?в???????????е??????????????????????????????????????

??????1???ж??????????

??????2???ж??????????????????????????????????????????

??????3?????????????????????????

??????4????????????????????

??????5?????????????????????

??????6????????????????????????????????????????????

????????a??????????ready???????????????????????????????????У?

????????b??????????sleep??????????????????????

????????c??????????pend?????????????????????????????pend?б?????????????????????

??????7?????????pend??????????????????棻

??????8????????????????????л?????????????У?

??????9???????ε?????е??????task???????????

???????????????????????????????????????????????????????????????????????????????????????????????

RAW_U16 raw_mutex_put(RAW_MUTEX *mutex_ptr)
{

   LIST *block_list_head;

   RAW_SR_ALLOC();

   #if (RAW_MUTEX_FUNCTION_CHECK > 0)

   if (mutex_ptr == 0) {
    return RAW_NULL_OBJECT;
   }

   #endif

   block_list_head = &mutex_ptr->common_block_obj.block_list;

   RAW_CRITICAL_ENTER();

   /*Must release the mutex by self*/
   if (raw_task_active != mutex_ptr->occupy) {
    RAW_CRITICAL_EXIT();
    return RAW_MUTEX_NOT_RELEASE_BY_OCCYPY;
   }

   /*if no block task on this list just return*/
   if (is_list_empty(block_list_head)) {
    mutex_ptr->count   = 1;
    RAW_CRITICAL_EXIT();
    return RAW_SUCCESS;
   }

     /*if priority was changed?? just change it back to original priority*/

   if (raw_task_active->priority != mutex_ptr->occupy_original_priority) {

    remove_ready_list(&raw_ready_queue?? raw_task_active);
    raw_task_active->priority = mutex_ptr->occupy_original_priority;
    add_ready_list_end(&raw_ready_queue?? raw_task_active);

   }

   /* there must have task blocked on this mutex object*/
   mutex_ptr->occupy       =   list_entry(block_list_head->next?? RAW_TASK_OBJ?? task_list);
   /*the first blocked task became the occupy task*/
   mutex_ptr->occupy_original_priority = mutex_ptr->occupy->priority;
   /*mutex resource is occupied*/
   mutex_ptr->count   = 0;

   /*Wake up the occupy task?? which is the highst priority task on the list*/
   raw_wake_object(mutex_ptr->occupy);

   RAW_CRITICAL_EXIT();

   raw_sched();

   return RAW_SUCCESS;

}