C++ (Cpp) _Per_CPU_Wait_for_state示例

示例#1

void rtems_smp_secondary_cpu_initialize( void )
{
  Per_CPU_Control *self_cpu = _Per_CPU_Get();
  Thread_Control  *heir;

  #if defined(RTEMS_DEBUG)
    printk( "Made it to %d -- ", _Per_CPU_Get_index( self_cpu ) );
  #endif

  _Per_CPU_Change_state( self_cpu, PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING );

  _Per_CPU_Wait_for_state( self_cpu, PER_CPU_STATE_BEGIN_MULTITASKING );

  _Per_CPU_Change_state( self_cpu, PER_CPU_STATE_UP );

  /*
   *  The Scheduler will have selected the heir thread for each CPU core.
   *  Now we have been requested to perform the first context switch.  So
   *  force a switch to the designated heir and make it executing on
   *  THIS core.
   */
  heir = self_cpu->heir;
  heir->is_executing = true;
  self_cpu->executing->is_executing = false;
  self_cpu->executing = heir;
  self_cpu->dispatch_necessary = false;

  /*
   * Threads begin execution in the _Thread_Handler() function.   This function
   * will call _Thread_Enable_dispatch().
   */
  _Thread_Disable_dispatch();

  _CPU_Context_switch_to_first_task_smp( &heir->Registers );
}

示例#2

void _SMP_Request_other_cores_to_shutdown( void )
{
  uint32_t self = _SMP_Get_current_processor();
  uint32_t ncpus = _SMP_Get_processor_count();
  uint32_t cpu;

  _SMP_Broadcast_message( RTEMS_BSP_SMP_SHUTDOWN );

  for ( cpu = 0 ; cpu < ncpus ; ++cpu ) {
    if ( cpu != self ) {
      _Per_CPU_Wait_for_state(
        _Per_CPU_Get_by_index( cpu ),
        PER_CPU_STATE_SHUTDOWN
      );
    }
  }
}

示例#3

  void _SMP_Handler_initialize(void)
  {
    uint32_t max_cpus = rtems_configuration_get_maximum_processors();
    uint32_t cpu;

    /*
     *  Initialize per cpu pointer table
     */
    _Per_CPU_Information_p[0] = _Per_CPU_Get_by_index( 0 );
    for ( cpu = 1 ; cpu < max_cpus; ++cpu ) {

      Per_CPU_Control *p = _Per_CPU_Get_by_index( cpu );

      _Per_CPU_Information_p[cpu] = p;

#if CPU_ALLOCATE_INTERRUPT_STACK == TRUE
      {
        size_t size = rtems_configuration_get_interrupt_stack_size();
        uintptr_t ptr;

        p->interrupt_stack_low = _Workspace_Allocate_or_fatal_error( size );

        ptr = (uintptr_t) _Addresses_Add_offset( p->interrupt_stack_low, size );
        ptr &= ~(CPU_STACK_ALIGNMENT - 1);
        p->interrupt_stack_high = (void *)ptr;
      }
#endif
    }

    /*
     * Discover and initialize the secondary cores in an SMP system.
     */
    max_cpus = bsp_smp_initialize( max_cpus );

    _SMP_Processor_count = max_cpus;

    for ( cpu = 1 ; cpu < max_cpus; ++cpu ) {
      const Per_CPU_Control *per_cpu = _Per_CPU_Get_by_index( cpu );

      _Per_CPU_Wait_for_state(
        per_cpu,
        PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING
      );
    }
  }