nuttx/sched/sched_removeblocked.c

/************************************************************************
 * sched/sched_removeblocked.c
 *
 *   Copyright (C) 2007, 2009 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 NuttX 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,
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 ************************************************************************/

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

#include <nuttx/config.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_removeblocked
 *
 * Description:
 *   This function removes a TCB from one of the blocked
 *   state task lists as inferreded from the task_state
 *   inside the TCB.
 *
 * Inputs:
 *   btcb - Points to the TCB that is blocked
 *
 * Return Value:
 *   None
 *
 * Assumptions:
 * - The caller has established a critical section before
 *   calling this function.
 *
 ************************************************************************/

void sched_removeblocked(FAR _TCB *btcb)
{
  tstate_t task_state = btcb->task_state;

  /* Make sure the TCB is in a valid blocked state */

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

  /* Remove the TCB from the blocked task list associated
   * with this state
   */

  dq_rem((FAR dq_entry_t*)btcb, (dq_queue_t*)g_tasklisttable[task_state].list);

  /* Make sure the TCB's state corresponds to not being in
   * any list
   */

  btcb->task_state = TSTATE_TASK_INVALID;
}