nuttx/sched/task_init.c

/************************************************************
 * task_init.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 <nuttx/config.h>
#include <sys/types.h>
#include <sched.h>
#include <nuttx/arch.h>
#include "os_internal.h"

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

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

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

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

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

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

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

/************************************************************
 * Name: task_init
 *
 * Description:
 *   This function initializes a Task Control Block (TCB)
 *   in preparation for starting a new thread.  It performs a
 *   subset of the functionality of task_create()
 *
 *   Unlike task_create(), task_init() does not activate the
 *   task. This must be done by calling task_activate().
 *
 * Input Parameters:
 *   tcb        - Address of the new task's TCB
 *   name       - Name of the new task (not used)
 *   priority   - Priority of the new task
 *   stack      - Start of the pre-allocated stack
 *   stack_size - Size (in bytes) of the stack allocated
 *   entry      - Application start point of the new task
 *   arg        - A pointer to an array of input parameters.
 *                Up to  CONFIG_MAX_TASK_ARG parameters may
 *                be provided.  If fewer than CONFIG_MAX_TASK_ARG
 *                parameters are passed, the list should be
 *                terminated with a NULL argv[] value.
 *                If no parameters are required, argv may be
 *                NULL.
 *
 * Return Value:
 *   OK on success; ERROR on failure.  (See task_schedsetup()
 *   for possible failure conditions).
 *
 ************************************************************/

#ifndef CONFIG_CUSTOM_STACK
STATUS task_init(FAR _TCB *tcb, const char *name, int priority,
                 FAR uint32 *stack, uint32 stack_size,
                 main_t entry, const char *argv[])
#else
STATUS task_init(FAR _TCB *tcb, const char *name, int priority,
                 main_t entry, const char *argv[])
#endif
{
  STATUS ret;

  /* Configure the user provided stack region */

#ifndef CONFIG_CUSTOM_STACK
  up_use_stack(tcb, stack, stack_size);
#endif

  /* Initialize the task control block */

  ret = task_schedsetup(tcb, priority, task_start, entry);
  if (ret == OK)
    {
      /* Setup to pass parameters to the new task */

      (void)task_argsetup(tcb, name, argv);
    }
  return ret;
 }