/**
* @file
*
* @brief Inlined Routines in the Core Message Handler
*
* This include file contains the static inline implementation of all
* inlined routines in the Core Message Handler.
*/
/*
* 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.com/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_COREMSGIMPL_H
#define _RTEMS_SCORE_COREMSGIMPL_H
#include <rtems/score/coremsg.h>
#include <rtems/score/chainimpl.h>
#include <limits.h>
#include <string.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @addtogroup ScoreMessageQueue
*/
/**@{**/
/**
* @brief Used when appending messages onto a message queue.
*
* This is the priority constant used when appending messages onto
* a message queue.
*/
#define CORE_MESSAGE_QUEUE_SEND_REQUEST INT_MAX
/**
* @brief Used when prepending messages onto a message queue.
*
* This is the priority constant used when prepending messages onto
* a message queue.
*/
#define CORE_MESSAGE_QUEUE_URGENT_REQUEST INT_MIN
/**
* @brief The modes in which a message may be submitted to a message queue.
*
* The following type details the modes in which a message
* may be submitted to a message queue. The message may be posted
* in a send or urgent fashion.
*
* @note All other values are message priorities. Numerically smaller
* priorities indicate higher priority messages.
*/
typedef int CORE_message_queue_Submit_types;
/**
* @brief The possible set of Core Message Queue handler return statuses.
*
* This enumerated type defines the possible set of Core Message
* Queue handler return statuses.
*/
typedef enum {
/** This value indicates the operation completed sucessfully. */
CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL,
/** This value indicates that the message was too large for this queue. */
CORE_MESSAGE_QUEUE_STATUS_INVALID_SIZE,
/** This value indicates that there are too many messages pending. */
CORE_MESSAGE_QUEUE_STATUS_TOO_MANY,
/** This value indicates that a receive was unsuccessful. */
CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED,
/** This value indicates that a blocking send was unsuccessful. */
CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_NOWAIT,
/** This value indicates that the message queue being blocked upon
* was deleted while the thread was waiting.
*/
CORE_MESSAGE_QUEUE_STATUS_WAS_DELETED,
/** This value indicates that the thread had to timeout while waiting
* to receive a message because one did not become available.
*/
CORE_MESSAGE_QUEUE_STATUS_TIMEOUT,
/** This value indicates that a blocking receive was unsuccessful. */
CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_WAIT
} CORE_message_queue_Status;
/**
* @brief Core message queue last status value.
*
* This is the last status value.
*/
#define CORE_MESSAGE_QUEUE_STATUS_LAST CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_WAIT
/**
* @brief Callout provides to support global/multiprocessor operations.
*
* The following type defines the callout which the API provides
* to support global/multiprocessor operations on message_queues.
*/
typedef void ( *CORE_message_queue_API_mp_support_callout )(
Thread_Control *,
Objects_Id
);
/**
* @brief Initialize a message queue.
*
* DESCRIPTION:
*
* This package is the implementation of the CORE Message Queue Handler.
* This core object provides task synchronization and communication functions
* via messages passed to queue objects.
*
* This routine initializes @a the_message_queue
* based on the parameters passed.
*
* @param[in] the_message_queue points to the message queue to initialize
* @param[in] the_message_queue_attributes points to the attributes that
* will be used with this message queue instance
* @param[in] maximum_pending_messages is the maximum number of messages
* that will be allowed to pend at any given time
* @param[in] maximum_message_size is the size of largest message that
* may be sent to this message queue instance
*
* @retval true if the message queue can be initialized. In general,
* false will only be returned if memory for the pending
* messages cannot be allocated.
*/
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
);
/**
* @brief Close a message queue.
*
* DESCRIPTION:
* This package is the implementation of the CORE Message Queue Handler.
* This core object provides task synchronization and communication functions
* via messages passed to queue objects
*
* This function closes a message by returning all allocated space and
* flushing @a the_message_queue's task wait queue.
*
* @param[in] the_message_queue points to the message queue to close
* @param[in] remote_extract_callout is the routine to call for each thread
* that is extracted from the set of waiting threads
* @param[in] status is the status that each waiting thread will return
* from it's blocking service
*/
void _CORE_message_queue_Close(
CORE_message_queue_Control *the_message_queue,
Thread_queue_Flush_callout remote_extract_callout,
uint32_t status
);
/**
* @brief Flush pending messages.
*
* DESCRIPTION:
* This package is the implementation of the CORE Message Queue Handler.
* This core object provides task synchronization and communication functions
* via messages passed to queue objects.
*
* This function flushes @a the_message_queue's pending message queue. The
* number of messages flushed from the queue is returned.
*
* @param[in] the_message_queue points to the message queue to flush
*
* @retval This method returns the number of message pending messages flushed.
*/
uint32_t _CORE_message_queue_Flush(
CORE_message_queue_Control *the_message_queue
);
/**
* @brief Flush all outstanding messages.
*
* This routine flushes all outstanding messages and returns
* them to the inactive message chain.
*
* @param[in] the_message_queue points to the message queue to flush
*
* @retval This method returns the number of pending messages flushed.
*
* - INTERRUPT LATENCY:
* + single case
*/
uint32_t _CORE_message_queue_Flush_support(
CORE_message_queue_Control *the_message_queue
);
#if defined(FUNCTIONALITY_NOT_CURRENTLY_USED_BY_ANY_API)
/**
* @brief Flush waiting threads.
*
* This function flushes the threads which are blocked on
* @a the_message_queue's pending message queue. They are
* unblocked whether blocked sending or receiving. It returns
* the number of messages flushed from the queue.
*
* @param[in] the_message_queue points to the message queue to flush
* @retval number of messages flushed from the queue
*/
void _CORE_message_queue_Flush_waiting_threads(
CORE_message_queue_Control *the_message_queue
);
#endif
/**
* @brief Broadcast a message to the message queue.
*
* DESCRIPTION:
* This package is the implementation of the CORE Message Queue Handler.
* This core object provides task synchronization and communication functions
* via messages passed to queue objects.
*
* This function sends a message for every thread waiting on the queue and
* returns the number of threads made ready by the message.
*
* @param[in] the_message_queue points to the message queue
* @param[in] buffer is the starting address of the message to broadcast
* @param[in] size is the size of the message being broadcast
* @param[in] id is the RTEMS object Id associated with this message queue.
* It is used when unblocking a remote thread.
* @param[in] api_message_queue_mp_support is the routine to invoke if
* a thread that is unblocked is actually a remote thread.
* @param[out] count points to the variable that will contain the
* number of tasks that are sent this message
* @retval @a *count will contain the number of messages sent
* @retval indication of the successful completion or reason for failure
*/
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
);
/**
* @brief Submit a message to the message queue.
*
* This routine implements the send and urgent message functions. It
* processes a message that is to be submitted to the designated
* message queue. The message will either be processed as a
* send message which it will be inserted at the rear of the queue
* or it will be processed as an urgent message which will be inserted
* at the front of the queue.
*
* @param[in] the_message_queue points to the message queue
* @param[in] buffer is the starting address of the message to send
* @param[in] size is the size of the message being send
* @param[in] id is the RTEMS object Id associated with this message queue.
* It is used when unblocking a remote thread.
* @param[in] api_message_queue_mp_support is the routine to invoke if
* a thread that is unblocked is actually a remote thread.
* @param[in] submit_type determines whether the message is prepended,
* appended, or enqueued in priority order.
* @param[in] wait indicates whether the calling thread is willing to block
* if the message queue is full.
* @param[in] timeout is the maximum number of clock ticks that the calling
* thread is willing to block if the message queue is full.
* @retval indication of the successful completion or reason for failure
*/
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
);
/**
* @brief Size a message from the message queue.
*
* DESCRIPTION:
* This package is the implementation of the CORE Message Queue Handler.
* This core object provides task synchronization and communication functions
* via messages passed to queue objects.
*
* This kernel routine dequeues a message, copies the message buffer to
* a given destination buffer, and frees the message buffer to the
* inactive message pool. The thread will be blocked if wait is true,
* otherwise an error will be given to the thread if no messages are available.
*
* @param[in] the_message_queue points to the message queue
* @param[in] id is the RTEMS object Id associated with this message queue.
* It is used when unblocking a remote thread.
* @param[in] buffer is the starting address of the message buffer to
* to be filled in with a message
* @param[in] size_p is a pointer to the size of the @a buffer and
* indicates the maximum size message that the caller can receive.
* @param[in] wait indicates whether the calling thread is willing to block
* if the message queue is empty.
* @param[in] timeout is the maximum number of clock ticks that the calling
* thread is willing to block if the message queue is empty.
*
* @retval indication of the successful completion or reason for failure.
* On success, the location pointed to @a size_p will contain the
* size of the received message.
*
* @note Returns message priority via return area in TCB.
*
* - INTERRUPT LATENCY:
* + available
* + wait
*/
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
);
/**
* @brief Insert a message into the message queue.
*
* This kernel routine inserts the specified message into the
* message queue. It is assumed that the message has been filled
* in before this routine is called.
*
* @param[in] the_message_queue points to the message queue
* @param[in] the_message is the message to enqueue
* @param[in] submit_type determines whether the message is prepended,
* appended, or enqueued in priority order.
*
* - INTERRUPT LATENCY:
* + insert
*/
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
);
/**
* This routine sends a message to the end of the specified message queue.
*/
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
)
{
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 */
);
}
/**
* This routine sends a message to the front of the specified message queue.
*/
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
)
{
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 */
);
}
/**
* This routine copies the contents of the source message buffer
* to the destination message buffer.
*/
RTEMS_INLINE_ROUTINE void _CORE_message_queue_Copy_buffer (
const void *source,
void *destination,
size_t size
)
{
memcpy(destination, source, size);
}
/**
* This function allocates a message buffer from the inactive
* message buffer chain.
*/
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( &the_message_queue->Inactive_messages );
}
/**
* This routine frees a message buffer to the inactive
* message buffer chain.
*/
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( &the_message_queue->Inactive_messages, &the_message->Node );
}
/**
* This function returns the priority of @a the_message.
*
* @note It encapsulates the optional behavior that message priority is
* disabled if no API requires it.
*/
RTEMS_INLINE_ROUTINE int _CORE_message_queue_Get_message_priority (
CORE_message_queue_Buffer_control *the_message
)
{
#if defined(RTEMS_SCORE_COREMSG_ENABLE_MESSAGE_PRIORITY)
return the_message->priority;
#else
return 0;
#endif
}
/**
* This function sets the priority of @a the_message.
*
* @note It encapsulates the optional behavior that message priority is
* disabled if no API requires it.
*/
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
}
/**
* This function removes the first message from the_message_queue
* and returns a pointer to it.
*/
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 );
}
/**
* This function returns true if the priority attribute is
* enabled in the attribute_set and false otherwise.
*/
RTEMS_INLINE_ROUTINE bool _CORE_message_queue_Is_priority(
CORE_message_queue_Attributes *the_attribute
)
{
return
(the_attribute->discipline == CORE_MESSAGE_QUEUE_DISCIPLINES_PRIORITY);
}
/**
* This routine places the_message at the rear of the outstanding
* messages on the_message_queue.
*/
RTEMS_INLINE_ROUTINE void _CORE_message_queue_Append_unprotected (
CORE_message_queue_Control *the_message_queue,
CORE_message_queue_Buffer_control *the_message
)
{
_Chain_Append_unprotected(
&the_message_queue->Pending_messages,
&the_message->Node
);
}
/**
* This routine places the_message at the front of the outstanding
* messages on the_message_queue.
*/
RTEMS_INLINE_ROUTINE void _CORE_message_queue_Prepend_unprotected (
CORE_message_queue_Control *the_message_queue,
CORE_message_queue_Buffer_control *the_message
)
{
_Chain_Prepend_unprotected(
&the_message_queue->Pending_messages,
&the_message->Node
);
}
/**
* This function returns true if the_message_queue is true and false otherwise.
*/
RTEMS_INLINE_ROUTINE bool _CORE_message_queue_Is_null (
CORE_message_queue_Control *the_message_queue
)
{
return ( the_message_queue == NULL );
}
#if defined(RTEMS_SCORE_COREMSG_ENABLE_NOTIFICATION)
/**
* This function returns true if notification is enabled on this message
* queue and false otherwise.
*/
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
/**
* This routine initializes the notification information for
* @a the_message_queue.
*/
#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
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
