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/**
* @file
*
* @brief RTEMS Task Mode
* @ingroup ClassicTasks
*/
/*
* 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/tasks.h>
#include <rtems/rtems/asrimpl.h>
#include <rtems/rtems/modesimpl.h>
#include <rtems/score/threadimpl.h>
#include <rtems/config.h>
static void _RTEMS_Tasks_Dispatch_if_necessary(
Thread_Control *executing,
bool needs_asr_dispatching
)
{
if ( _Thread_Dispatch_is_enabled() ) {
bool dispatch_necessary = needs_asr_dispatching;
/*
* FIXME: This locking approach is brittle. It only works since the
* current simple SMP scheduler has no support for the non-preempt mode.
*/
#if defined( RTEMS_SMP )
ISR_Level level;
_ISR_Disable_without_giant( level );
#endif
if ( !_Thread_Is_heir( executing ) && executing->is_preemptible ) {
dispatch_necessary = true;
_Thread_Dispatch_necessary = dispatch_necessary;
}
#if defined( RTEMS_SMP )
_ISR_Enable_without_giant( level );
#endif
if ( dispatch_necessary ) {
_Thread_Dispatch();
}
}
}
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;
bool needs_asr_dispatching;
rtems_mode old_mode;
if ( !previous_mode_set )
return RTEMS_INVALID_ADDRESS;
executing = _Thread_Get_executing();
api = executing->API_Extensions[ THREAD_API_RTEMS ];
asr = &api->Signal;
old_mode = (executing->is_preemptible) ? RTEMS_PREEMPT : RTEMS_NO_PREEMPT;
if ( executing->budget_algorithm == THREAD_CPU_BUDGET_ALGORITHM_NONE )
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;
/*
* These are generic thread scheduling characteristics.
*/
if ( mask & RTEMS_PREEMPT_MASK ) {
#if defined( RTEMS_SMP )
if ( rtems_configuration_is_smp_enabled() &&
!_Modes_Is_preempt( mode_set ) ) {
return RTEMS_NOT_IMPLEMENTED;
}
#endif
executing->is_preemptible = _Modes_Is_preempt( mode_set );
}
if ( mask & RTEMS_TIMESLICE_MASK ) {
if ( _Modes_Is_timeslice(mode_set) ) {
executing->budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE;
executing->cpu_time_budget =
rtems_configuration_get_ticks_per_timeslice();
} else
executing->budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
}
/*
* Set the new interrupt level
*/
if ( mask & RTEMS_INTERRUPT_MASK )
_Modes_Set_interrupt_level( mode_set );
/*
* This is specific to the RTEMS API
*/
needs_asr_dispatching = false;
if ( mask & RTEMS_ASR_MASK ) {
bool is_asr_enabled = !_Modes_Is_asr_disabled( mode_set );
if ( is_asr_enabled != asr->is_enabled ) {
asr->is_enabled = is_asr_enabled;
_ASR_Swap_signals( asr );
if ( _ASR_Are_signals_pending( asr ) ) {
needs_asr_dispatching = true;
_Thread_Add_post_switch_action(
executing,
&api->Signal_action
);
}
}
}
_RTEMS_Tasks_Dispatch_if_necessary( executing, needs_asr_dispatching );
return RTEMS_SUCCESSFUL;
}
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