relibc_pthreads-emb/pthread_attr_init.c

/*
 * pthread_attr_init.c
 *
 * Description:
 * This translation unit implements operations on thread attribute objects.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
 *      Copyright(C) 2008 Jason Schmidlapp
 *
 *      Contact Email: jschmidlapp@users.sourceforge.net
 *
 *
 *      Based upon Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
 *
 *      Contact Email: rpj@callisto.canberra.edu.au
 *
 *      The original list of contributors to the Pthreads-win32 project
 *      is contained in the file CONTRIBUTORS.ptw32 included with the
 *      source code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *      http://sources.redhat.com/pthreads-win32/contributors.html
 *
 *      This library is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU Lesser General Public
 *      License as published by the Free Software Foundation; either
 *      version 2 of the License, or (at your option) any later version.
 *
 *      This library is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *      Lesser General Public License for more details.
 *
 *      You should have received a copy of the GNU Lesser General Public
 *      License along with this library in the file COPYING.LIB;
 *      if not, write to the Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include <stdlib.h>

#include "pthread.h"
#include "implement.h"


int
pthread_attr_init (pthread_attr_t * attr)
/*
 * ------------------------------------------------------
 * DOCPUBLIC
 *      Initializes a thread attributes object with default
 *      attributes.
 *
 * PARAMETERS
 *      attr
 *              pointer to an instance of pthread_attr_t
 *
 *
 * DESCRIPTION
 *      Initializes a thread attributes object with default
 *      attributes.
 *
 *      NOTES:
 *              1)      Used to define thread attributes
 *
 * RESULTS
 *              0               successfully initialized attr,
 *              ENOMEM          insufficient memory for attr.
 *
 * ------------------------------------------------------
 */
{
  pthread_attr_t attr_result;

  if (attr == NULL)
    {
      /* This is disallowed. */
      return EINVAL;
    }

  attr_result = (pthread_attr_t) malloc (sizeof (*attr_result));

  if (attr_result == NULL)
    {
      return ENOMEM;
    }

#ifdef _POSIX_THREAD_ATTR_STACKSIZE
  /*
   * Default to zero size?
   */
  attr_result->stacksize = 0;
#endif

#ifdef _POSIX_THREAD_ATTR_STACKADDR
  /* FIXME: Set this to something sensible when we support it. */
  attr_result->stackaddr = NULL;
#endif

  attr_result->detachstate = PTHREAD_CREATE_JOINABLE;

  /*
   * Win32 sets new threads to THREAD_PRIORITY_NORMAL and
   * not to that of the parent thread. We choose to default to
   * this arrangement.
   */
  attr_result->param.sched_priority = pte_osThreadGetDefaultPriority();
  attr_result->inheritsched = PTHREAD_EXPLICIT_SCHED;
  attr_result->contentionscope = PTHREAD_SCOPE_SYSTEM;

  attr_result->valid = PTE_ATTR_VALID;

  *attr = attr_result;

  return 0;
}