nuttx/sched/sched_addblocked.c

/************************************************************
 * sched_addblocked.c
 *
 *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name Gregory Nutt nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ************************************************************/

/************************************************************
 * Included Files
 ************************************************************/

#include <sys/types.h>
#include <queue.h>
#include <assert.h>
#include "os_internal.h"

/************************************************************
 * Definitions
 ************************************************************/

/************************************************************
 * Private Type Declarations
 ************************************************************/

/************************************************************
 * Global Variables
 ************************************************************/

/************************************************************
 * Private Variables
 ************************************************************/

/************************************************************
 * Private Function Prototypes
 ************************************************************/

/************************************************************
 * Public Functions
 ************************************************************/

/************************************************************
 * Name: sched_addblocked
 *
 * Description:
 *   This function adds a TCB to one of the blocked state
 *   task lists as inferreded from task_state.
 *
 * Inputs:
 *   btcb - Points to the TCB that is blocked
 *   task_state - identifies the state of the blocked task
 *
 * Return Value:
 *   None
 *
 * Assumptions:
 * - The caller has established a critical section before
 *   calling this function.
 *
 ************************************************************/

void sched_addblocked(_TCB *btcb, tstate_t task_state)
{
   /* Make sure that we received a valid blocked state */

   ASSERT(task_state >= FIRST_BLOCKED_STATE &&
          task_state <= LAST_BLOCKED_STATE);

   /* Add the TCB to the blocked task list associated with
    * this state. First, determine if the task is to be added
    * to a prioritized task list
    */

   if (g_tasklisttable[task_state].prioritized)
     {
       /* Add the task to a prioritized list */

       sched_addprioritized(btcb, g_tasklisttable[task_state].list);
     }
   else
     {
       /* Add the task to a non-prioritized list */

       dq_addlast((dq_entry_t*)btcb, g_tasklisttable[task_state].list);
     }

   /* Make sure the TCB's state corresponds to the list */

   btcb->task_state = task_state;
}