source: rtems/cpukit/rtems/src/taskcreate.c

/* SPDX-License-Identifier: BSD-2-Clause */

/**
 * @file
 *
 * @ingroup RTEMSImplClassicTask
 *
 * @brief This source file contains the implementation of
 *   rtems_task_create().
 */

/*
 * Copyright (C) 2020 embedded brains GmbH & Co. KG
 *
 * 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.
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <rtems/rtems/tasksimpl.h>
#include <rtems/score/stackimpl.h>

#include <string.h>

static rtems_status_code _RTEMS_tasks_Allocate_and_prepare_stack(
  Thread_Configuration    *thread_config,
  const rtems_task_config *config
)
{
  size_t size;

  thread_config->stack_free = _Stack_Free;
  size = _Stack_Ensure_minimum( config->storage_size );
  size = _Stack_Extend_size( size, thread_config->is_fp );
  thread_config->stack_size = size;
  thread_config->stack_area = _Stack_Allocate( size );

  if ( thread_config->stack_area == NULL ) {
    return RTEMS_UNSATISFIED;
  }

  return RTEMS_SUCCESSFUL;
}

rtems_status_code rtems_task_create(
  rtems_name           name,
  rtems_task_priority  initial_priority,
  size_t               stack_size,
  rtems_mode           initial_modes,
  rtems_attribute      attribute_set,
  rtems_id            *id
)
{
  rtems_task_config config;

  memset( &config, 0, sizeof( config ) );
  config.name = name;
  config.initial_priority = initial_priority;
  config.storage_size = stack_size;
  config.initial_modes = initial_modes;
  config.attributes = attribute_set;

  return _RTEMS_tasks_Create(
    &config,
    id,
    _RTEMS_tasks_Allocate_and_prepare_stack
  );
}