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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.
*
* $Id$
*/
#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_Suspend
*
* This kernel routine sets the SUSPEND state in the THREAD. The
* THREAD chain and suspend count are adjusted if necessary.
*
* Input parameters:
* the_thread - pointer to thread control block
*
* Output parameters: NONE
*
* INTERRUPT LATENCY:
* ready chain
* select map
*/
void _Thread_Suspend(
Thread_Control *the_thread
)
{
ISR_Level level;
Chain_Control *ready;
ready = the_thread->ready;
_ISR_Disable( level );
the_thread->suspend_count++;
if ( !_States_Is_ready( the_thread->current_state ) ) {
the_thread->current_state =
_States_Set( STATES_SUSPENDED, the_thread->current_state );
_ISR_Enable( level );
return;
}
the_thread->current_state = STATES_SUSPENDED;
if ( _Chain_Has_only_one_node( ready ) ) {
_Chain_Initialize_empty( ready );
_Priority_Remove_from_bit_map( &the_thread->Priority_map );
} else
_Chain_Extract_unprotected( &the_thread->Object.Node );
_ISR_Flash( level );
if ( _Thread_Is_heir( the_thread ) )
_Thread_Calculate_heir();
if ( _Thread_Is_executing( the_thread ) )
_Context_Switch_necessary = TRUE;
_ISR_Enable( level );
}
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