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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_Resume
*
* This kernel routine clears the SUSPEND state if the suspend_count
* drops below one. If the force parameter is set the suspend_count
* is forced back to zero. The thread ready chain is adjusted if
* necessary and the Heir thread is set accordingly.
*
* Input parameters:
* the_thread - pointer to thread control block
* force - force the suspend count back to 0
*
* Output parameters: NONE
*
* INTERRUPT LATENCY:
* priority map
* select heir
*/
void _Thread_Resume(
Thread_Control *the_thread,
boolean force
)
{
ISR_Level level;
States_Control current_state;
_ISR_Disable( level );
if ( force == TRUE )
the_thread->suspend_count = 0;
else
the_thread->suspend_count--;
if ( the_thread->suspend_count > 0 ) {
_ISR_Enable( level );
return;
}
current_state = the_thread->current_state;
if ( current_state & STATES_SUSPENDED ) {
current_state =
the_thread->current_state = _States_Clear(STATES_SUSPENDED, current_state);
if ( _States_Is_ready( current_state ) ) {
_Priority_Add_to_bit_map( &the_thread->Priority_map );
_Chain_Append_unprotected(the_thread->ready, &the_thread->Object.Node);
_ISR_Flash( level );
if ( the_thread->current_priority < _Thread_Heir->current_priority ) {
_Thread_Heir = the_thread;
if ( _Thread_Executing->is_preemptible ||
the_thread->current_priority == 0 )
_Context_Switch_necessary = TRUE;
}
}
}
_ISR_Enable( level );
}
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