nuttx/sched/task/task_starthook.c

/****************************************************************************
 * sched/task/task_starthook.c
 *
 *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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 <nuttx/sched.h>

#include "task/task.h"

#ifdef CONFIG_SCHED_STARTHOOK

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

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

/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

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

/****************************************************************************
 * Private Functions
 ****************************************************************************/

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

/****************************************************************************
 * Name: task_starthook
 *
 * Description:
 *   Configure a start hook... a function that will be called on the thread
 *   of the new task before the new task's main entry point is called.
 *   The start hook is useful, for example, for setting up automatic
 *   configuration of C++ constructors.
 *
 * Inputs:
 *   tcb - The new, unstarted task task that needs the start hook
 *   starthook - The pointer to the start hook function
 *   arg - The argument to pass to the start hook function.
 *
 * Return:
 *   None
 *
 ****************************************************************************/

void task_starthook(FAR struct task_tcb_s *tcb, starthook_t starthook,
                    FAR void *arg)
{
  /* Only tasks can have starthooks.  The starthook will be called when the
   * task is started (or restarted).
   */

#ifndef CONFIG_DISABLE_PTHREAD
  DEBUGASSERT(tcb &&
             (tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_PTHREAD);
#endif

  /* Set up the start hook */

  tcb->starthook    = starthook;
  tcb->starthookarg = arg;
}

#endif /* CONFIG_SCHED_STARTHOOK */