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/*

 *  Thread Handler

 *

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: thread.c,v 1.2 2001-09-27 11:59:34 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/apiext.h>

#include <rtems/score/context.h>

#include <rtems/score/interr.h>

#include <rtems/score/isr.h>

#include <rtems/score/object.h>

#include <rtems/score/priority.h>

#include <rtems/score/states.h>

#include <rtems/score/sysstate.h>

#include <rtems/score/thread.h>

#include <rtems/score/threadq.h>

#include <rtems/score/userext.h>

#include <rtems/score/wkspace.h>

/*PAGE

 *

 *  _Thread_Handler_initialization

 *

 *  This routine initializes all thread manager related data structures.

 *

 *  Input parameters:

 *    ticks_per_timeslice - clock ticks per quantum

 *    maximum_proxies     - number of proxies to initialize

 *

 *  Output parameters:  NONE

 */

void _Thread_Handler_initialization(

  unsigned32   ticks_per_timeslice,

  unsigned32   maximum_extensions,

  unsigned32   maximum_proxies

)

{

  unsigned32      index;

  /*

   * BOTH stacks hooks must be set or both must be NULL.

   * Do not allow mixture.

   */

  if ( !( ( _CPU_Table.stack_allocate_hook == 0 )

       == ( _CPU_Table.stack_free_hook == 0 ) ) )

    _Internal_error_Occurred(

      INTERNAL_ERROR_CORE,

      TRUE,

      INTERNAL_ERROR_BAD_STACK_HOOK

    );

  _Context_Switch_necessary = FALSE;

  _Thread_Executing         = NULL;

  _Thread_Heir              = NULL;

  _Thread_Allocated_fp      = NULL;

  _Thread_Do_post_task_switch_extension = 0;

  _Thread_Maximum_extensions = maximum_extensions;

  _Thread_Ticks_per_timeslice  = ticks_per_timeslice;

  _Thread_Ready_chain = (Chain_Control *) _Workspace_Allocate_or_fatal_error(

    (PRIORITY_MAXIMUM + 1) * sizeof(Chain_Control)

  );

  for ( index=0; index <= PRIORITY_MAXIMUM ; index++ )

    _Chain_Initialize_empty( &_Thread_Ready_chain[ index ] );

#if defined(RTEMS_MULTIPROCESSING)

  _Thread_MP_Handler_initialization( maximum_proxies );

#endif

  /*

   *  Initialize this class of objects.

   */

  _Objects_Initialize_information(

    &_Thread_Internal_information,

    OBJECTS_INTERNAL_THREADS,

    FALSE,

    ( _System_state_Is_multiprocessing ) ?  2 : 1,

    sizeof( Thread_Control ),

    TRUE,

    8,

    TRUE

  );

}