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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [threadqextractpriority.c] - Blame information for rev 609

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Line No. Rev Author Line
1 30 unneback
/*
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 *  Thread Queue 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 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: threadqextractpriority.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/chain.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/states.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/tqdata.h>
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/*PAGE
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 *
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 *  _Thread_queue_Extract_priority
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 *
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 *  This routine removes a specific thread from the specified threadq,
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 *  deletes any timeout, and unblocks the thread.
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 *
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 *  Input parameters:
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 *    the_thread_queue - pointer to a threadq header
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 *    the_thread       - pointer to a thread control block
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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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 *    EXTRACT_PRIORITY
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 */
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void _Thread_queue_Extract_priority(
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  Thread_queue_Control *the_thread_queue,
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  Thread_Control       *the_thread
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)
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{
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  ISR_Level              level;
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  Chain_Node     *the_node;
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  Chain_Node     *next_node;
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  Chain_Node     *previous_node;
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  Thread_Control *new_first_thread;
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  Chain_Node     *new_first_node;
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  Chain_Node     *new_second_node;
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  Chain_Node     *last_node;
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  the_node = (Chain_Node *) the_thread;
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  _ISR_Disable( level );
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  if ( _States_Is_waiting_on_thread_queue( the_thread->current_state ) ) {
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    next_node     = the_node->next;
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    previous_node = the_node->previous;
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    if ( !_Chain_Is_empty( &the_thread->Wait.Block2n ) ) {
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      new_first_node   = the_thread->Wait.Block2n.first;
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      new_first_thread = (Thread_Control *) new_first_node;
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      last_node        = the_thread->Wait.Block2n.last;
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      new_second_node  = new_first_node->next;
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      previous_node->next      = new_first_node;
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      next_node->previous      = new_first_node;
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      new_first_node->next     = next_node;
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      new_first_node->previous = previous_node;
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      if ( !_Chain_Has_only_one_node( &the_thread->Wait.Block2n ) ) {
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                                          /* > two threads on 2-n */
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        new_second_node->previous =
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                  _Chain_Head( &new_first_thread->Wait.Block2n );
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        new_first_thread->Wait.Block2n.first = new_second_node;
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        new_first_thread->Wait.Block2n.last = last_node;
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        last_node->next = _Chain_Tail( &new_first_thread->Wait.Block2n );
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      }
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    } else {
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      previous_node->next = next_node;
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      next_node->previous = previous_node;
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    }
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    if ( !_Watchdog_Is_active( &the_thread->Timer ) ) {
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      _ISR_Enable( level );
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      _Thread_Unblock( the_thread );
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    } else {
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      _Watchdog_Deactivate( &the_thread->Timer );
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      _ISR_Enable( level );
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      (void) _Watchdog_Remove( &the_thread->Timer );
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      _Thread_Unblock( the_thread );
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    }
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#if defined(RTEMS_MULTIPROCESSING)
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    if ( !_Objects_Is_local_id( the_thread->Object.id ) )
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      _Thread_MP_Free_proxy( the_thread );
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#endif
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  }
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  else
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    _ISR_Enable( level );
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}
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