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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [threadrotatequeue.c] - Blame information for rev 173

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1 30 unneback
/*
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 *  Thread Handler
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 *
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: threadrotatequeue.c,v 1.2 2001-09-27 11:59:34 chris Exp $
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 */
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#include <rtems/system.h>
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#include <rtems/score/apiext.h>
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#include <rtems/score/context.h>
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#include <rtems/score/interr.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/object.h>
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#include <rtems/score/priority.h>
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#include <rtems/score/states.h>
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#include <rtems/score/sysstate.h>
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#include <rtems/score/thread.h>
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#include <rtems/score/threadq.h>
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#include <rtems/score/userext.h>
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#include <rtems/score/wkspace.h>
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/*PAGE
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 *
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 *  _Thread_Rotate_Ready_Queue
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 *
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 *  This kernel routine will rotate the ready queue.
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 *  remove the running THREAD from the ready chain
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 *  and place it immediatly at the rear of this chain.  Reset timeslice
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 *  and yield the processor functions both use this routine, therefore if
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 *  reset is TRUE and this is the only thread on the chain then the
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 *  timeslice counter is reset.  The heir THREAD will be updated if the
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 *  running is also the currently the heir.
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 *
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 *  Input parameters:
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 *      Priority of the queue we wish to modify.
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 *
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 *  Output parameters:  NONE
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 *
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 *  INTERRUPT LATENCY:
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 *    ready chain
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 *    select heir
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 */
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void _Thread_Rotate_Ready_Queue(
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  Priority_Control  priority
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)
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{
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  ISR_Level       level;
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  Thread_Control *executing;
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  Chain_Control  *ready;
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  Chain_Node     *node;
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  ready     = &_Thread_Ready_chain[ priority ];
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  executing = _Thread_Executing;
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  if ( ready == executing->ready ) {
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    _Thread_Yield_processor();
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    return;
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  }
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  _ISR_Disable( level );
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  if ( !_Chain_Is_empty( ready ) ) {
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    if (!_Chain_Has_only_one_node( ready ) ) {
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      node = _Chain_Get_first_unprotected( ready );
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      _Chain_Append_unprotected( ready, node );
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    }
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  }
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  _ISR_Flash( level );
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  if ( _Thread_Heir->ready == ready )
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    _Thread_Heir = (Thread_Control *) ready->first;
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  if ( executing != _Thread_Heir )
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    _Context_Switch_necessary = TRUE;
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  _ISR_Enable( level );
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}
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