forked from Imagelibrary/rtems
797c232dad
* libi2c/README_libi2c: Correct spelling error. * score/src/threadclearstate.c: Improve comment.
98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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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.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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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_Clear_state
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*
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* This kernel routine clears the appropriate states in the
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* requested thread. The thread ready chain is adjusted if
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* necessary and the Heir thread is set accordingly.
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*
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* Input parameters:
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* the_thread - pointer to thread control block
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* state - state set to clear
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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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* priority map
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* select heir
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*/
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void _Thread_Clear_state(
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Thread_Control *the_thread,
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States_Control state
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)
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{
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ISR_Level level;
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States_Control current_state;
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_ISR_Disable( level );
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current_state = the_thread->current_state;
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if ( current_state & state ) {
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current_state =
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the_thread->current_state = _States_Clear( state, current_state );
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if ( _States_Is_ready( current_state ) ) {
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_Priority_Add_to_bit_map( &the_thread->Priority_map );
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_Chain_Append_unprotected(the_thread->ready, &the_thread->Object.Node);
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_ISR_Flash( level );
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/*
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* If the thread that was unblocked is more important than the heir,
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* then we have a new heir. This may or may not result in a
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* context switch.
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*
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* Normal case:
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* If the current thread is preemptible, then we need to do
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* a context switch.
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* Pseudo-ISR case:
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* Even if the thread isn't preemptible, if the new heir is
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* a pseudo-ISR system task, we need to do a context switch.
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*/
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if ( the_thread->current_priority < _Thread_Heir->current_priority ) {
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_Thread_Heir = the_thread;
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if ( _Thread_Executing->is_preemptible ||
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the_thread->current_priority == 0 )
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_Context_Switch_necessary = TRUE;
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}
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}
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}
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_ISR_Enable( level );
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}
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