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/**
* @file
*
* @ingroup RTEMSImplClassicTask
*
* @brief This source file contains the implementation of
* rtems_task_mode().
*/
/*
* COPYRIGHT (c) 1989-2014.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/tasksdata.h>
#include <rtems/rtems/modesimpl.h>
#include <rtems/rtems/signalimpl.h>
#include <rtems/score/isrlevel.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/smpimpl.h>
#include <rtems/score/threadimpl.h>
rtems_status_code rtems_task_mode(
rtems_mode mode_set,
rtems_mode mask,
rtems_mode *previous_mode_set
)
{
Thread_Control *executing;
RTEMS_API_Control *api;
ASR_Information *asr;
rtems_mode old_mode;
executing = _Thread_Get_executing();
if ( !previous_mode_set )
return RTEMS_INVALID_ADDRESS;
#if defined(RTEMS_SMP)
if (
( mask & RTEMS_PREEMPT_MASK ) != 0 &&
!_Modes_Is_preempt_mode_supported( mode_set, executing )
) {
return RTEMS_NOT_IMPLEMENTED;
}
#endif
#if defined(RTEMS_SMP) || CPU_ENABLE_ROBUST_THREAD_DISPATCH == TRUE
if (
( mask & RTEMS_INTERRUPT_MASK ) != 0 &&
!_Modes_Is_interrupt_level_supported( mode_set )
) {
return RTEMS_NOT_IMPLEMENTED;
}
#endif
/*
* Complete all error checking before doing any operations which
* impact the executing thread. There should be no errors returned
* past this point.
*/
api = executing->API_Extensions[ THREAD_API_RTEMS ];
asr = &api->Signal;
old_mode = (executing->is_preemptible) ? RTEMS_PREEMPT : RTEMS_NO_PREEMPT;
if ( executing->CPU_budget.operations == NULL )
old_mode |= RTEMS_NO_TIMESLICE;
else
old_mode |= RTEMS_TIMESLICE;
old_mode |= (asr->is_enabled) ? RTEMS_ASR : RTEMS_NO_ASR;
old_mode |= _ISR_Get_level();
*previous_mode_set = old_mode;
if ( ( mask & RTEMS_TIMESLICE_MASK ) != 0 ) {
_Modes_Apply_timeslice_to_thread( mode_set, executing );
}
if ( ( mask & RTEMS_INTERRUPT_MASK ) != 0 ) {
_ISR_Set_level( _Modes_Get_interrupt_level( mode_set ) );
}
if ( ( mask & ( RTEMS_ASR_MASK | RTEMS_PREEMPT_MASK ) ) != 0 ) {
bool need_thread_dispatch;
ISR_lock_Context lock_context;
need_thread_dispatch = false;
_Thread_State_acquire( executing, &lock_context );
if ( ( mask & RTEMS_ASR_MASK ) != 0 ) {
bool previous_asr_is_enabled;
previous_asr_is_enabled = asr->is_enabled;
asr->is_enabled = !_Modes_Is_asr_disabled( mode_set );
if (
!previous_asr_is_enabled &&
asr->is_enabled &&
asr->signals_pending != 0
) {
need_thread_dispatch = true;
_Thread_Append_post_switch_action( executing, &api->Signal_action );
}
}
if ( ( mask & RTEMS_PREEMPT_MASK ) != 0 ) {
bool previous_is_preemptible;
previous_is_preemptible = executing->is_preemptible;
executing->is_preemptible = _Modes_Is_preempt( mode_set );
if ( executing->is_preemptible && !previous_is_preemptible ) {
need_thread_dispatch = true;
_Scheduler_Schedule( executing );
}
}
if ( need_thread_dispatch ) {
Per_CPU_Control *cpu_self;
cpu_self = _Thread_Dispatch_disable_critical( &lock_context );
_Thread_State_release( executing, &lock_context );
_Thread_Dispatch_direct( cpu_self );
} else {
_Thread_State_release( executing, &lock_context );
}
}
return RTEMS_SUCCESSFUL;
}
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