nuttx/libc/pthread/pthread_attr_setinheritsched.c

/****************************************************************************
 * libc/pthread/pthread_attr_setinheritsched.c
 *
 *   Copyright (C) 2007, 2009, 2011 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,
 * 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 <stdint.h>
#include <pthread.h>
#include <string.h>
#include <debug.h>
#include <errno.h>

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

/****************************************************************************
 * Name:  pthread_attr_setinheritsched
 *
 * Description:
 *   Indicate whether the scheduling info in the pthread
 *   attributes will be used or if the thread will
 *   inherit the properties of the parent.
 *
 * Parameters:
 *   attr
 *   policy
 *
 * Returned Value:
 *   0 if successful.  Otherwise, an error code.
 *
 * Assumptions:
 *
 ****************************************************************************/

int pthread_attr_setinheritsched(FAR pthread_attr_t *attr,
                                 int inheritsched)
{
  int ret;

  linfo("inheritsched=%d\n", inheritsched);

  if (!attr ||
      (inheritsched != PTHREAD_INHERIT_SCHED &&
       inheritsched != PTHREAD_EXPLICIT_SCHED))
    {
      ret = EINVAL;
    }
  else
    {
      attr->inheritsched = (uint8_t)inheritsched;
      ret = OK;
    }

  linfo("Returning %d\n", ret);
  return ret;
}