coremsgimpl.h

Go to the documentation of this file.

/*
 *  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_COREMSGIMPL_H
#define _RTEMS_SCORE_COREMSGIMPL_H

#include <rtems/score/coremsg.h>
#include <rtems/score/chainimpl.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/threadqimpl.h>

#include <limits.h>
#include <string.h>

#ifdef __cplusplus
extern "C" {
#endif

#define  CORE_MESSAGE_QUEUE_SEND_REQUEST   INT_MAX

#define  CORE_MESSAGE_QUEUE_URGENT_REQUEST INT_MIN

typedef int CORE_message_queue_Submit_types;

typedef enum {
  CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL,
  CORE_MESSAGE_QUEUE_STATUS_INVALID_SIZE,
  CORE_MESSAGE_QUEUE_STATUS_TOO_MANY,
  CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED,
  CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_NOWAIT,
  CORE_MESSAGE_QUEUE_STATUS_WAS_DELETED,
  CORE_MESSAGE_QUEUE_STATUS_TIMEOUT,
  CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_WAIT
}   CORE_message_queue_Status;

#define CORE_MESSAGE_QUEUE_STATUS_LAST CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_WAIT

typedef void ( *CORE_message_queue_API_mp_support_callout )(
                 Thread_Control *,
                 Objects_Id
             );

bool _CORE_message_queue_Initialize(
  CORE_message_queue_Control    *the_message_queue,
  CORE_message_queue_Attributes *the_message_queue_attributes,
  uint32_t                       maximum_pending_messages,
  size_t                         maximum_message_size
);

void _CORE_message_queue_Close(
  CORE_message_queue_Control *the_message_queue,
  Thread_queue_Flush_callout  remote_extract_callout,
  uint32_t                    status
);

uint32_t   _CORE_message_queue_Flush(
  CORE_message_queue_Control *the_message_queue,
  ISR_lock_Context           *lock_context
);

#if defined(FUNCTIONALITY_NOT_CURRENTLY_USED_BY_ANY_API)

  void _CORE_message_queue_Flush_waiting_threads(
    CORE_message_queue_Control *the_message_queue
  );
#endif

CORE_message_queue_Status _CORE_message_queue_Broadcast(
  CORE_message_queue_Control                *the_message_queue,
  const void                                *buffer,
  size_t                                     size,
  Objects_Id                                 id,
  CORE_message_queue_API_mp_support_callout  api_message_queue_mp_support,
  uint32_t                                  *count,
  ISR_lock_Context                          *lock_context
);

CORE_message_queue_Status _CORE_message_queue_Submit(
  CORE_message_queue_Control                *the_message_queue,
  Thread_Control                            *executing,
  const void                                *buffer,
  size_t                                     size,
  Objects_Id                                 id,
  CORE_message_queue_API_mp_support_callout  api_message_queue_mp_support,
  CORE_message_queue_Submit_types            submit_type,
  bool                                       wait,
  Watchdog_Interval                          timeout,
  ISR_lock_Context                          *lock_context
);

void _CORE_message_queue_Seize(
  CORE_message_queue_Control      *the_message_queue,
  Thread_Control                  *executing,
  Objects_Id                       id,
  void                            *buffer,
  size_t                          *size_p,
  bool                             wait,
  Watchdog_Interval                timeout,
  ISR_lock_Context                *lock_context
);

void _CORE_message_queue_Insert_message(
  CORE_message_queue_Control        *the_message_queue,
  CORE_message_queue_Buffer_control *the_message,
  CORE_message_queue_Submit_types    submit_type
);

RTEMS_INLINE_ROUTINE CORE_message_queue_Status _CORE_message_queue_Send(
  CORE_message_queue_Control                *the_message_queue,
  const void                                *buffer,
  size_t                                     size,
  Objects_Id                                 id,
  CORE_message_queue_API_mp_support_callout  api_message_queue_mp_support,
  bool                                       wait,
  Watchdog_Interval                          timeout,
  ISR_lock_Context                          *lock_context
)
{
  return _CORE_message_queue_Submit(
    the_message_queue,
    _Thread_Executing,
    buffer,
    size,
    id,
    api_message_queue_mp_support,
    CORE_MESSAGE_QUEUE_SEND_REQUEST,
    wait,     /* sender may block */
    timeout,  /* timeout interval */
    lock_context
  );
}

RTEMS_INLINE_ROUTINE CORE_message_queue_Status _CORE_message_queue_Urgent(
  CORE_message_queue_Control                *the_message_queue,
  const void                                *buffer,
  size_t                                     size,
  Objects_Id                                 id,
  CORE_message_queue_API_mp_support_callout  api_message_queue_mp_support,
  bool                                       wait,
  Watchdog_Interval                          timeout,
  ISR_lock_Context                          *lock_context
)
{
  return _CORE_message_queue_Submit(
    the_message_queue,
    _Thread_Executing,
    buffer,
    size,
    id,
    api_message_queue_mp_support,
    CORE_MESSAGE_QUEUE_URGENT_REQUEST,
    wait,     /* sender may block */
    timeout,  /* timeout interval */
    lock_context
 );
}

RTEMS_INLINE_ROUTINE void _CORE_message_queue_Acquire(
  CORE_message_queue_Control *the_message_queue,
  ISR_lock_Context           *lock_context
)
{
  _Thread_queue_Acquire( &the_message_queue->Wait_queue, lock_context );
}

RTEMS_INLINE_ROUTINE void _CORE_message_queue_Acquire_critical(
  CORE_message_queue_Control *the_message_queue,
  ISR_lock_Context           *lock_context
)
{
  _Thread_queue_Acquire_critical( &the_message_queue->Wait_queue, lock_context );

  #if defined(RTEMS_MULTIPROCESSING)
    /*
     * In case RTEMS_MULTIPROCESSING is enabled, then we have to prevent
     * deletion of the executing thread after the thread queue operations.
     */
    _Thread_Dispatch_disable();
  #endif
}

RTEMS_INLINE_ROUTINE void _CORE_message_queue_Release(
  CORE_message_queue_Control *the_message_queue,
  ISR_lock_Context           *lock_context
)
{
  _Thread_queue_Release( &the_message_queue->Wait_queue, lock_context );
  #if defined(RTEMS_MULTIPROCESSING)
    _Thread_Dispatch_enable( _Per_CPU_Get() );
  #endif
}

RTEMS_INLINE_ROUTINE void _CORE_message_queue_Copy_buffer (
  const void *source,
  void       *destination,
  size_t      size
)
{
  memcpy(destination, source, size);
}

RTEMS_INLINE_ROUTINE CORE_message_queue_Buffer_control *
_CORE_message_queue_Allocate_message_buffer (
    CORE_message_queue_Control *the_message_queue
)
{
   return (CORE_message_queue_Buffer_control *)
     _Chain_Get_unprotected( &the_message_queue->Inactive_messages );
}

RTEMS_INLINE_ROUTINE void _CORE_message_queue_Free_message_buffer (
  CORE_message_queue_Control        *the_message_queue,
  CORE_message_queue_Buffer_control *the_message
)
{
  _Chain_Append_unprotected( &the_message_queue->Inactive_messages, &the_message->Node );
}

RTEMS_INLINE_ROUTINE int _CORE_message_queue_Get_message_priority (
  const CORE_message_queue_Buffer_control *the_message
)
{
  #if defined(RTEMS_SCORE_COREMSG_ENABLE_MESSAGE_PRIORITY)
    return the_message->priority;
  #else
    return 0;
  #endif
}

RTEMS_INLINE_ROUTINE void _CORE_message_queue_Set_message_priority (
  CORE_message_queue_Buffer_control *the_message,
  int                                priority
)
{
  #if defined(RTEMS_SCORE_COREMSG_ENABLE_MESSAGE_PRIORITY)
    the_message->priority = priority;
  #endif
}

RTEMS_INLINE_ROUTINE
  CORE_message_queue_Buffer_control *_CORE_message_queue_Get_pending_message (
  CORE_message_queue_Control *the_message_queue
)
{
  return (CORE_message_queue_Buffer_control *)
    _Chain_Get_unprotected( &the_message_queue->Pending_messages );
}

RTEMS_INLINE_ROUTINE bool _CORE_message_queue_Is_priority(
  CORE_message_queue_Attributes *the_attribute
)
{
  return
    (the_attribute->discipline == CORE_MESSAGE_QUEUE_DISCIPLINES_PRIORITY);
}

#if defined(RTEMS_SCORE_COREMSG_ENABLE_NOTIFICATION)

  RTEMS_INLINE_ROUTINE bool _CORE_message_queue_Is_notify_enabled (
    CORE_message_queue_Control *the_message_queue
  )
  {
    return (the_message_queue->notify_handler != NULL);
  }
#endif

#if defined(RTEMS_SCORE_COREMSG_ENABLE_NOTIFICATION)
  RTEMS_INLINE_ROUTINE void _CORE_message_queue_Set_notify (
    CORE_message_queue_Control        *the_message_queue,
    CORE_message_queue_Notify_Handler  the_handler,
    void                              *the_argument
  )
  {
    the_message_queue->notify_handler  = the_handler;
    the_message_queue->notify_argument = the_argument;
  }
#else
  /* turn it into nothing if not enabled */
  #define _CORE_message_queue_Set_notify( \
           the_message_queue, the_handler, the_argument )
#endif

RTEMS_INLINE_ROUTINE Thread_Control *_CORE_message_queue_Dequeue_receiver(
  CORE_message_queue_Control      *the_message_queue,
  const void                      *buffer,
  size_t                           size,
  CORE_message_queue_Submit_types  submit_type,
  ISR_lock_Context                *lock_context
)
{
  Thread_Control *the_thread;

  /*
   *  If there are pending messages, then there can't be threads
   *  waiting for us to send them a message.
   *
   *  NOTE: This check is critical because threads can block on
   *        send and receive and this ensures that we are broadcasting
   *        the message to threads waiting to receive -- not to send.
   */
  if ( the_message_queue->number_of_pending_messages != 0 ) {
    return NULL;
  }

  /*
   *  There must be no pending messages if there is a thread waiting to
   *  receive a message.
   */
  the_thread = _Thread_queue_First_locked( &the_message_queue->Wait_queue );
  if ( the_thread == NULL ) {
    return NULL;
  }

   *(size_t *) the_thread->Wait.return_argument = size;
   the_thread->Wait.count = (uint32_t) submit_type;

  _CORE_message_queue_Copy_buffer(
    buffer,
    the_thread->Wait.return_argument_second.mutable_object,
    size
  );

  _Thread_queue_Extract_critical(
    &the_message_queue->Wait_queue,
    the_thread,
    lock_context
  );

  return the_thread;
}

#ifdef __cplusplus
}
#endif

#endif
/* end of include file */