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/*

 *  $Id: keycreate.c,v 1.2 2001-09-27 11:59:17 chris Exp $

 */

#include <errno.h>

#include <limits.h>

#include <pthread.h>

#include <string.h>

#include <rtems/system.h>

#include <rtems/score/thread.h>

#include <rtems/score/wkspace.h>

#include <rtems/posix/key.h>

/*PAGE

 *

 *  17.1.1 Thread-Specific Data Key Create, P1003.1c/Draft 10, p. 163

 */

int pthread_key_create(

  pthread_key_t  *key,

  void          (*destructor)( void * )

)

{

  POSIX_Keys_Control  *the_key;

  void                *table;

  unsigned32           the_class;

  unsigned32           bytes_to_allocate;

  _Thread_Disable_dispatch();

  the_key = _POSIX_Keys_Allocate();

  if ( !the_key ) {

    _Thread_Enable_dispatch();

    return EAGAIN;

  }

  the_key->destructor = destructor;

  /*

   *  This is a bit more complex than one might initially expect because

   *  APIs are optional.  Thus there may be no ITRON tasks to have keys

   *  for.  [NOTE: Currently RTEMS Classic API tasks are not always enabled.]

   */

  for ( the_class = OBJECTS_CLASSES_FIRST_THREAD_CLASS;

        the_class <= OBJECTS_CLASSES_LAST_THREAD_CLASS;

        the_class++ ) {

    if ( _Objects_Information_table[ the_class ] ) {

      bytes_to_allocate = sizeof( void * ) *

        (_Objects_Information_table[ the_class ]->maximum + 1);

      table = _Workspace_Allocate( bytes_to_allocate );

      if ( !table ) {

        for ( --the_class;

              the_class >= OBJECTS_CLASSES_FIRST_THREAD_CLASS;

              the_class-- )

          _Workspace_Free( the_key->Values[ the_class ] );

        _POSIX_Keys_Free( the_key );

        _Thread_Enable_dispatch();

        return ENOMEM;

      }

      the_key->Values[ the_class ] = table;

      memset( table, '\0', bytes_to_allocate );

    } else {

      the_key->Values[ the_class ] = NULL;

    }

  }

  the_key->is_active = TRUE;

  _Objects_Open( &_POSIX_Keys_Information, &the_key->Object, 0 );

  *key = the_key->Object.id;

  _Thread_Enable_dispatch();

  return 0;

}