Beispiel #1
0
void _POSIX_signals_Action_handler(
  Thread_Control  *executing,
  Thread_Action   *action,
  Per_CPU_Control *cpu,
  ISR_Level        level
)
{
  POSIX_API_Control  *api;
  int                 signo;
  ISR_lock_Context    lock_context;
  int                 hold_errno;

  (void) action;
  _Thread_Action_release_and_ISR_enable( cpu, level );

  api = executing->API_Extensions[ THREAD_API_POSIX ];

  /*
   *  We need to ensure that if the signal handler executes a call
   *  which overwrites the unblocking status, we restore it.
   */
  hold_errno = executing->Wait.return_code;

  /*
   * api may be NULL in case of a thread close in progress
   */
  if ( !api )
    return;

  /*
   *  If we invoke any user code, there is the possibility that
   *  a new signal has been posted that we should process so we
   *  restart the loop if a signal handler was invoked.
   *
   *  The first thing done is to check there are any signals to be
   *  processed at all.  No point in doing this loop otherwise.
   */
  while (1) {
    _POSIX_signals_Acquire( &lock_context );
      if ( !(~api->signals_blocked &
            (api->signals_pending | _POSIX_signals_Pending)) ) {
       _POSIX_signals_Release( &lock_context );
       break;
     }
    _POSIX_signals_Release( &lock_context );

    for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) {
      _POSIX_signals_Check_signal( api, signo, false );
      _POSIX_signals_Check_signal( api, signo, true );
    }
    /* Unfortunately - nothing like __SIGFIRSTNOTRT in newlib signal .h */

    for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) {
      _POSIX_signals_Check_signal( api, signo, false );
      _POSIX_signals_Check_signal( api, signo, true );
    }
  }

  executing->Wait.return_code = hold_errno;
}
Beispiel #2
0
bool _Thread_Set_life_protection( bool protect )
{
  bool previous_life_protection;
  ISR_Level level;
  Per_CPU_Control *cpu;
  Thread_Control *executing;
  Thread_Life_state previous_life_state;

  cpu = _Thread_Action_ISR_disable_and_acquire_for_executing( &level );
  executing = cpu->executing;

  previous_life_state = executing->Life.state;
  previous_life_protection = _Thread_Is_life_protected( previous_life_state );

  if ( protect ) {
    executing->Life.state = previous_life_state | THREAD_LIFE_PROTECTED;
  } else {
    executing->Life.state = previous_life_state & ~THREAD_LIFE_PROTECTED;
  }

  _Thread_Action_release_and_ISR_enable( cpu, level );

#if defined(RTEMS_SMP)
  /*
   * On SMP configurations it is possible that a life change of an executing
   * thread is requested, but this thread didn't notice it yet.  The life
   * change is first marked in the life state field and then all scheduling and
   * other thread state updates are performed.  The last step is to issues an
   * inter-processor interrupt if necessary.  Since this takes some time we
   * have to synchronize here.
   */
  if (
    !_Thread_Is_life_protected( previous_life_state )
      && _Thread_Is_life_changing( previous_life_state )
  ) {
    _Thread_Disable_dispatch();
    _Thread_Enable_dispatch();
  }
#endif

  if (
    !protect
      && _Thread_Is_life_changing( previous_life_state )
  ) {
    _Thread_Disable_dispatch();
    _Thread_Start_life_change_for_executing( executing );
    _Thread_Enable_dispatch();
  }

  return previous_life_protection;
}
Beispiel #3
0
static void _Thread_Request_life_change(
  Thread_Control    *the_thread,
  Thread_Control    *executing,
  Priority_Control   priority,
  Thread_Life_state  additional_life_state
)
{
  Thread_Life_state previous_life_state;
  Per_CPU_Control *cpu;
  ISR_Level level;
  const Scheduler_Control *scheduler;

  cpu = _Thread_Action_ISR_disable_and_acquire( the_thread, &level );
  previous_life_state = the_thread->Life.state;
  the_thread->Life.state = previous_life_state | additional_life_state;
  _Thread_Action_release_and_ISR_enable( cpu, level );

  scheduler = _Scheduler_Get( the_thread );
  if ( the_thread == executing ) {
    executing->real_priority = priority;

    _Scheduler_Set_priority_if_higher( scheduler, the_thread, priority );
    _Thread_Start_life_change_for_executing( executing );
  } else if ( previous_life_state == THREAD_LIFE_NORMAL ) {
    _Thread_Start_life_change( the_thread, scheduler, priority );
  } else {
    _Thread_Clear_state( the_thread, STATES_SUSPENDED );

    if ( _Thread_Is_life_terminating( additional_life_state ) ) {
      the_thread->real_priority = _Scheduler_Highest_priority_of_two(
        scheduler,
        the_thread->real_priority,
        priority
      );

      _Scheduler_Change_priority_if_higher(
        scheduler,
        the_thread,
        priority,
        false
      );
    }
  }
}
Beispiel #4
0
static void _Thread_Run_post_switch_actions( Thread_Control *executing )
{
  ISR_Level        level;
  Per_CPU_Control *cpu_self;
  Thread_Action   *action;

  cpu_self = _Thread_Action_ISR_disable_and_acquire( executing, &level );
  action = _Thread_Get_post_switch_action( executing );

  while ( action != NULL ) {
    _Chain_Set_off_chain( &action->Node );

    ( *action->handler )( executing, action, cpu_self, level );

    cpu_self = _Thread_Action_ISR_disable_and_acquire( executing, &level );
    action = _Thread_Get_post_switch_action( executing );
  }

  _Thread_Action_release_and_ISR_enable( cpu_self, level );
}
Beispiel #5
0
void _Thread_Life_action_handler(
  Thread_Control  *executing,
  Thread_Action   *action,
  Per_CPU_Control *cpu,
  ISR_Level        level
)
{
  Thread_Life_state previous_life_state;

  (void) action;

  previous_life_state = executing->Life.state;
  executing->Life.state = THREAD_LIFE_PROTECTED;

  _Thread_Action_release_and_ISR_enable( cpu, level );

  if ( _Thread_Is_life_terminating( previous_life_state ) ) {
    _User_extensions_Thread_terminate( executing );
  } else {
    _Assert( _Thread_Is_life_restarting( previous_life_state ) );

    _User_extensions_Thread_restart( executing );
  }

  _Thread_Disable_dispatch();

  if ( _Thread_Is_life_terminating( previous_life_state ) ) {
    _Thread_Make_zombie( executing );

    if ( executing->Life.terminator != NULL ) {
      _Thread_Clear_state(
        executing->Life.terminator,
        STATES_WAITING_FOR_TERMINATION
      );
    }

    _Thread_Enable_dispatch();

    _Assert_Not_reached();
  } else {
    _Assert( _Thread_Is_life_restarting( previous_life_state ) );

    if ( _Thread_Is_life_terminating( executing->Life.state ) ) {
      /* Someone deleted us in the mean-time */
      _Thread_Start_life_change_for_executing( executing );
    } else {
      _Assert( executing->Timer.state == WATCHDOG_INACTIVE );
      _Assert(
        executing->current_state == STATES_READY
          || executing->current_state == STATES_SUSPENDED
      );

      executing->Life.state = THREAD_LIFE_NORMAL;

      _Thread_Load_environment( executing );
      _Thread_Restart_self( executing );

      _Assert_Not_reached();
    }
  }
}