threaddispatch.h

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/*
 * COPYRIGHT (c) 1989-2009.
 * 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.
 */

#ifndef _RTEMS_SCORE_THREADDISPATCH_H
#define _RTEMS_SCORE_THREADDISPATCH_H

#include <rtems/score/percpu.h>
#include <rtems/score/isrlock.h>
#include <rtems/score/profiling.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#if defined(RTEMS_SMP) || ( CPU_ENABLE_ROBUST_THREAD_DISPATCH == TRUE )

#define RTEMS_SCORE_ROBUST_THREAD_DISPATCH
#endif

RTEMS_INLINE_ROUTINE bool _Thread_Dispatch_is_enabled(void)
{
  bool enabled;

#if defined(RTEMS_SMP)
  ISR_Level level;

  _ISR_Local_disable( level );
#endif

  enabled = _Thread_Dispatch_disable_level == 0;

#if defined(RTEMS_SMP)
  _ISR_Local_enable( level );
#endif

  return enabled;
}

RTEMS_INLINE_ROUTINE uint32_t _Thread_Dispatch_get_disable_level(void)
{
  return _Thread_Dispatch_disable_level;
}

RTEMS_INLINE_ROUTINE void _Thread_Dispatch_initialization( void )
{
  _Thread_Dispatch_disable_level = 1;
}

void _Thread_Dispatch( void );

void _Thread_Dispatch_direct( Per_CPU_Control *cpu_self );

void _Thread_Do_dispatch( Per_CPU_Control *cpu_self, ISR_Level level );

RTEMS_INLINE_ROUTINE Per_CPU_Control *_Thread_Dispatch_disable_with_CPU(
  Per_CPU_Control        *cpu_self,
  const ISR_lock_Context *lock_context
)
{
  uint32_t disable_level;

  disable_level = cpu_self->thread_dispatch_disable_level;
  _Profiling_Thread_dispatch_disable_critical(
    cpu_self,
    disable_level,
    lock_context
  );
  cpu_self->thread_dispatch_disable_level = disable_level + 1;

  return cpu_self;
}

RTEMS_INLINE_ROUTINE Per_CPU_Control *_Thread_Dispatch_disable_critical(
  const ISR_lock_Context *lock_context
)
{
  return _Thread_Dispatch_disable_with_CPU( _Per_CPU_Get(), lock_context );
}

RTEMS_INLINE_ROUTINE Per_CPU_Control *_Thread_Dispatch_disable( void )
{
  Per_CPU_Control  *cpu_self;
  ISR_lock_Context  lock_context;

#if defined( RTEMS_SMP ) || defined( RTEMS_PROFILING )
  _ISR_lock_ISR_disable( &lock_context );
#endif

  cpu_self = _Thread_Dispatch_disable_critical( &lock_context );

#if defined( RTEMS_SMP ) || defined( RTEMS_PROFILING )
  _ISR_lock_ISR_enable( &lock_context );
#endif

  return cpu_self;
}

void _Thread_Dispatch_enable( Per_CPU_Control *cpu_self );

RTEMS_INLINE_ROUTINE void _Thread_Dispatch_unnest( Per_CPU_Control *cpu_self )
{
  _Assert( cpu_self->thread_dispatch_disable_level > 0 );
  --cpu_self->thread_dispatch_disable_level;
}

RTEMS_INLINE_ROUTINE void _Thread_Dispatch_request(
  Per_CPU_Control *cpu_self,
  Per_CPU_Control *cpu_target
)
{
#if defined( RTEMS_SMP )
  if ( cpu_self == cpu_target ) {
    cpu_self->dispatch_necessary = true;
  } else {
    _Atomic_Fetch_or_ulong( &cpu_target->message, 0, ATOMIC_ORDER_RELEASE );
    _CPU_SMP_Send_interrupt( _Per_CPU_Get_index( cpu_target ) );
  }
#else
 cpu_self->dispatch_necessary = true;
 (void) cpu_target;
#endif
}

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* _RTEMS_SCORE_THREADDISPATCH_H */