source: rtems/cpukit/include/rtems/posix/mqueueimpl.h @ 7038271

/**
 * @file
 *
 * @brief Private Inlined Routines for POSIX Message Queue
 * 
 * This include file contains the static inline implementation of the private 
 * inlined routines for POSIX Message Queue.
 */

/*
 *  COPYRIGHT (c) 1989-2013.
 *  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_POSIX_MQUEUE_INL
#define _RTEMS_POSIX_MQUEUE_INL

#include <rtems/posix/mqueue.h>
#include <rtems/posix/posixapi.h>
#include <rtems/score/coremsgimpl.h>
#include <rtems/score/threadqimpl.h>

#include <rtems/seterr.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 *  This defines the information control block used to manage
 *  this class of objects.
 */
extern Objects_Information _POSIX_Message_queue_Information;

/**
 * @brief Delete a POSIX Message Queue
 *
 * This routine supports the mq_unlink and mq_close routines by
 * doing most of the work involved with removing a message queue.
 */
void _POSIX_Message_queue_Delete(
  POSIX_Message_queue_Control *the_mq,
  Thread_queue_Context        *queue_context
);

/*@
 *  @brief POSIX Message Queue Receive Support
 *
 *  This routine supports the various flavors of receiving a message.
 *
 *  @note The structure of the routines is identical to that of POSIX
 *        Message_queues to leave the option of having unnamed message
 *        queues at a future date.  They are currently not part of the
 *        POSIX standard but unnamed message_queues are.  This is also
 *        the reason for the apparently unnecessary tracking of
 *        the process_shared attribute.  [In addition to the fact that
 *        it would be trivial to add pshared to the mq_attr structure
 *        and have process private message queues.]
 *
 * @note This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open time.
 */
ssize_t _POSIX_Message_queue_Receive_support(
  mqd_t                         mqdes,
  char                         *msg_ptr,
  size_t                        msg_len,
  unsigned int                 *msg_prio,
  const struct timespec        *abstime,
  Thread_queue_Enqueue_callout  enqueue_callout
);

/**
 *  @brief POSIX Message Queue Send Support
 *
 *  This routine posts a message to a specified message queue.
 */
int _POSIX_Message_queue_Send_support(
  mqd_t                         mqdes,
  const char                   *msg_ptr,
  size_t                        msg_len,
  unsigned int                  msg_prio,
  const struct timespec        *abstime,
  Thread_queue_Enqueue_callout  enqueue_callout
);

RTEMS_INLINE_ROUTINE POSIX_Message_queue_Control *
  _POSIX_Message_queue_Allocate_unprotected( void )
{
  return (POSIX_Message_queue_Control *)
    _Objects_Allocate_unprotected( &_POSIX_Message_queue_Information );
}

/**
 *  @brief POSIX Message Queue Free
 *
 *  This routine frees a message queue control block to the
 *  inactive chain of free message queue control blocks.
 */
RTEMS_INLINE_ROUTINE void _POSIX_Message_queue_Free(
  POSIX_Message_queue_Control *the_mq
)
{
  _Objects_Free( &_POSIX_Message_queue_Information, &the_mq->Object );
}


RTEMS_INLINE_ROUTINE POSIX_Message_queue_Control *_POSIX_Message_queue_Get(
  Objects_Id            id,
  Thread_queue_Context *queue_context
)
{
  _Thread_queue_Context_initialize( queue_context );
  return (POSIX_Message_queue_Control *) _Objects_Get(
    id,
    &queue_context->Lock_context.Lock_context,
    &_POSIX_Message_queue_Information
  );
}

/*
 *  @brief POSIX Message Queue Convert Message Priority to Score
 *
 *  This method converts a POSIX message priority to the priorities used
 *  by the Score.
 */
RTEMS_INLINE_ROUTINE CORE_message_queue_Submit_types
  _POSIX_Message_queue_Priority_to_core(
  unsigned int priority
)
{
  return (CORE_message_queue_Submit_types) priority * -1;
}


/*
 *  @brief POSIX Message Queue Convert Message Priority from Score
 *
 *  This method converts a POSIX message priority from the priorities used
 *  by the Score.
 */
RTEMS_INLINE_ROUTINE unsigned int _POSIX_Message_queue_Priority_from_core(
  CORE_message_queue_Submit_types priority
)
{
  /* absolute value without a library dependency */
  return (unsigned int) ((priority >= 0) ? priority : -priority);
}

/**
 *  @brief POSIX Message Queue Remove from Namespace
 */
RTEMS_INLINE_ROUTINE void _POSIX_Message_queue_Namespace_remove (
  POSIX_Message_queue_Control *the_mq
)
{
  _Objects_Namespace_remove_string(
    &_POSIX_Message_queue_Information,
    &the_mq->Object
  );
}

RTEMS_INLINE_ROUTINE POSIX_Message_queue_Control *
_POSIX_Message_queue_Get_by_name(
  const char                *name,
  size_t                    *name_length_p,
  Objects_Get_by_name_error *error
)
{
  return (POSIX_Message_queue_Control *) _Objects_Get_by_name(
    &_POSIX_Message_queue_Information,
    name,
    name_length_p,
    error
  );
}

#ifdef __cplusplus
}
#endif

#endif
/*  end of include file */