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authorSebastian Huber <sebastian.huber@embedded-brains.de>2020-06-24 06:34:49 +0200
committerSebastian Huber <sebastian.huber@embedded-brains.de>2021-04-23 08:33:32 +0200
commit73a0175406f734852e7ef083a9a15726e38ce678 (patch)
tree0ddbca56546418039d10608ca4f7ea9620601d45 /cpukit/include/rtems/rtems/message.h
parentrtems: Check for NULL config in task construct (diff)
downloadrtems-73a0175406f734852e7ef083a9a15726e38ce678.tar.bz2
rtems: Generate <rtems/rtems/message.h>
Change license to BSD-2-Clause according to file histories and documentation re-licensing agreement. Update #3899. Update #3993.
Diffstat (limited to '')
-rw-r--r--cpukit/include/rtems/rtems/message.h903
1 files changed, 720 insertions, 183 deletions
diff --git a/cpukit/include/rtems/rtems/message.h b/cpukit/include/rtems/rtems/message.h
index 14083b8cd0..a8ea7c1814 100644
--- a/cpukit/include/rtems/rtems/message.h
+++ b/cpukit/include/rtems/rtems/message.h
@@ -1,22 +1,61 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
/**
* @file
*
- * @ingroup ClassicMessageQueue
- *
- * @brief Classic Message Queue Manager API
+ * @brief This header file defines the Message Manager API.
+ */
+
+/*
+ * Copyright (C) 2020, 2021 embedded brains GmbH (http://www.embedded-brains.de)
+ * Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
*/
-/* COPYRIGHT (c) 1989-2013.
- * On-Line Applications Research Corporation (OAR).
+/*
+ * This file is part of the RTEMS quality process and was automatically
+ * generated. If you find something that needs to be fixed or
+ * worded better please post a report or patch to an RTEMS mailing list
+ * or raise a bug report:
*
- * 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.
+ * https://www.rtems.org/bugs.html
+ *
+ * For information on updating and regenerating please refer to the How-To
+ * section in the Software Requirements Engineering chapter of the
+ * RTEMS Software Engineering manual. The manual is provided as a part of
+ * a release. For development sources please refer to the online
+ * documentation at:
+ *
+ * https://docs.rtems.org
*/
+/* Generated from spec:/rtems/message/if/header */
+
#ifndef _RTEMS_RTEMS_MESSAGE_H
#define _RTEMS_RTEMS_MESSAGE_H
+#include <stddef.h>
+#include <stdint.h>
#include <rtems/rtems/attr.h>
#include <rtems/rtems/options.h>
#include <rtems/rtems/status.h>
@@ -27,17 +66,22 @@
extern "C" {
#endif
+/* Generated from spec:/rtems/message/if/group */
+
/**
- * @defgroup ClassicMessageQueue Message Queues
+ * @defgroup RTEMSAPIClassicMessage Message Manager
*
- * @ingroup RTEMSAPIClassic
+ * @ingroup RTEMSAPIClassic
*
- * This encapsulates functionality related to the Classic API Message Queue
- * Manager.
+ * @brief The Message Manager provides communication and synchronization
+ * capabilities using RTEMS message queues.
*/
-/**@{*/
+
+/* Generated from spec:/rtems/message/if/config */
/**
+ * @ingroup RTEMSAPIClassicMessage
+ *
* @brief This structure defines the configuration of a message queue
* constructed by rtems_message_queue_construct().
*/
@@ -90,51 +134,173 @@ typedef struct {
rtems_attribute attributes;
} rtems_message_queue_config;
+/* Generated from spec:/rtems/message/if/create */
+
/**
- * @brief Defines a structure which can be used as a message queue buffer for
- * messages of the specified maximum size.
+ * @ingroup RTEMSAPIClassicMessage
*
- * Use this macro to define the message buffer storage area for
- * rtems_message_queue_construct().
+ * @brief Creates a message queue.
*
- * @param _maximum_message_size is the maximum message size in bytes.
+ * @param name is the object name of the message queue.
+ *
+ * @param count is the maximum count of pending messages supported by the
+ * message queue.
+ *
+ * @param max_message_size is the maximum size in bytes of a message supported
+ * by the message queue.
+ *
+ * @param attribute_set is the attribute set of the message queue.
+ *
+ * @param[out] id is the pointer to an object identifier variable. When the
+ * directive call is successful, the identifier of the created message queue
+ * will be stored in this variable.
+ *
+ * This directive creates a message queue which resides on the local node. The
+ * message queue has the user-defined object name specified in ``name``.
+ * Memory is allocated from the RTEMS Workspace for the count of messages
+ * specified in ``count``, each of ``max_message_size`` bytes in length. The
+ * assigned object identifier is returned in ``id``. This identifier is used
+ * to access the message queue with other message queue related directives.
+ *
+ * The **attribute set** specified in ``attribute_set`` is built through a
+ * *bitwise or* of the attribute constants described below. Not all
+ * combinations of attributes are allowed. Some attributes are mutually
+ * exclusive. If mutually exclusive attributes are combined, the behaviour is
+ * undefined. Attributes not mentioned below are not evaluated by this
+ * directive and have no effect. Default attributes can be selected by using
+ * the #RTEMS_DEFAULT_ATTRIBUTES constant. The attribute set defines
+ *
+ * * the scope of the message queue: #RTEMS_LOCAL (default) or #RTEMS_GLOBAL
+ * and
+ *
+ * * the task wait queue discipline used by the message queue: #RTEMS_FIFO
+ * (default) or #RTEMS_PRIORITY.
+ *
+ * The message queue has a local or global **scope** in a multiprocessing
+ * network (this attribute does not refer to SMP systems). The scope is
+ * selected by the mutually exclusive #RTEMS_LOCAL and #RTEMS_GLOBAL
+ * attributes.
+ *
+ * * A **local scope** is the default and can be emphasized through the use of
+ * the #RTEMS_LOCAL attribute. A local message queue can be only used by the
+ * node which created it.
+ *
+ * * A **global scope** is established if the #RTEMS_GLOBAL attribute is set.
+ * Setting the global attribute in a single node system has no effect.
+ *
+ * The **task wait queue discipline** is selected by the mutually exclusive
+ * #RTEMS_FIFO and #RTEMS_PRIORITY attributes. The discipline defines the order
+ * in which tasks wait for a message to receive on a currently empty message
+ * queue.
+ *
+ * * The **FIFO discipline** is the default and can be emphasized through use
+ * of the #RTEMS_FIFO attribute.
+ *
+ * * The **priority discipline** is selected by the #RTEMS_PRIORITY attribute.
+ *
+ * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
+ *
+ * @retval ::RTEMS_INVALID_NAME The ``name`` parameter was invalid.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``id`` parameter was NULL.
+ *
+ * @retval ::RTEMS_INVALID_NUMBER The ``count`` parameter was invalid.
+ *
+ * @retval ::RTEMS_INVALID_SIZE The ``max_message_size`` parameter was invalid.
+ *
+ * @retval ::RTEMS_TOO_MANY There was no inactive object available to create a
+ * message queue. The number of message queue available to the application
+ * is configured through the #CONFIGURE_MAXIMUM_MESSAGE_QUEUES application
+ * configuration option.
+ *
+ * @retval ::RTEMS_TOO_MANY In multiprocessing configurations, there was no
+ * inactive global object available to create a global message queue. The
+ * number of global objects available to the application is configured
+ * through the #CONFIGURE_MP_MAXIMUM_GLOBAL_OBJECTS application configuration
+ * option.
+ *
+ * @retval ::RTEMS_INVALID_NUMBER The product of ``count`` and
+ * ``max_message_size`` is greater than the maximum storage size.
+ *
+ * @retval ::RTEMS_UNSATISFIED There was not enough memory available in the
+ * RTEMS Workspace to allocate the message buffers for the message queue.
+ *
+ * @par Notes
+ * @parblock
+ * For message queues with a global scope, the maximum message size is
+ * effectively limited to the longest message which the MPCI is capable of
+ * transmitting.
+ *
+ * For control and maintenance of the message queue, RTEMS allocates a QCB from
+ * the local QCB free pool and initializes it.
+ *
+ * The QCB for a global message queue is allocated on the local node. Message
+ * queues should not be made global unless remote tasks must interact with the
+ * message queue. This is to avoid the system overhead incurred by the
+ * creation of a global message queue. When a global message queue is created,
+ * the message queue's name and identifier must be transmitted to every node in
+ * the system for insertion in the local copy of the global object table.
+ * @endparblock
+ *
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
+ *
+ * * The directive may be called from within device driver initialization
+ * context.
+ *
+ * * The directive may be called from within task context.
+ *
+ * * The directive may obtain and release the object allocator mutex. This may
+ * cause the calling task to be preempted.
+ *
+ * * When the directive operates on a global object, the directive sends a
+ * message to remote nodes. This may preempt the calling task.
+ *
+ * * The number of message queues available to the application is configured
+ * through the #CONFIGURE_MAXIMUM_MESSAGE_QUEUES application configuration
+ * option.
+ *
+ * * Where the object class corresponding to the directive is configured to use
+ * unlimited objects, the directive may allocate memory from the RTEMS
+ * Workspace.
+ *
+ * * The number of global objects available to the application is configured
+ * through the #CONFIGURE_MP_MAXIMUM_GLOBAL_OBJECTS application configuration
+ * option.
+ * @endparblock
*/
-#define RTEMS_MESSAGE_QUEUE_BUFFER( _maximum_message_size ) \
- struct { \
- CORE_message_queue_Buffer _buffer; \
- char _message[ _maximum_message_size ]; \
- }
+rtems_status_code rtems_message_queue_create(
+ rtems_name name,
+ uint32_t count,
+ size_t max_message_size,
+ rtems_attribute attribute_set,
+ rtems_id *id
+);
+
+/* Generated from spec:/rtems/message/if/construct */
/**
+ * @ingroup RTEMSAPIClassicMessage
+ *
* @brief Constructs a message queue from the specified the message queue
* configuration.
*
- * In contrast to message queues created by rtems_message_queue_create(), the
- * message queues constructed by this directive use a user-provided message
- * buffer storage area.
- *
- * This directive is intended for applications which do not want to use the
- * RTEMS Workspace and instead statically allocate all operating system
- * resources. An application based solely on static allocation can avoid any
- * runtime memory allocators. This can simplify the application architecture
- * as well as any analysis that may be required.
- *
- * The value for #CONFIGURE_MESSAGE_BUFFER_MEMORY should not include memory for
- * message queues constructed by rtems_message_queue_construct().
- *
* @param config is the message queue configuration.
*
- * @param[out] id is the pointer to an object identifier variable. The
- * identifier of the constructed message queue object will be stored in this
- * variable, in case of a successful operation.
+ * @param[out] id is the pointer to an object identifier variable. When the
+ * directive call is successful, the identifier of the constructed message
+ * queue will be stored in this variable.
*
* @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
*
- * @retval ::RTEMS_INVALID_ADDRESS The id parameter was NULL.
+ * @retval ::RTEMS_INVALID_ADDRESS The ``config`` parameter was NULL.
*
* @retval ::RTEMS_INVALID_NAME The message queue name in the configuration was
* invalid.
*
+ * @retval ::RTEMS_INVALID_ADDRESS The ``id`` parameter was NULL.
+ *
* @retval ::RTEMS_INVALID_NUMBER The maximum number of pending messages in the
* configuration was zero.
*
@@ -161,101 +327,248 @@ typedef struct {
* @retval ::RTEMS_UNSATISFIED The message queue storage area size in the
* configuration was not equal to the size calculated from the maximum number
* of pending messages and the maximum message size.
+ *
+ * @par Notes
+ * @parblock
+ * In contrast to message queues created by rtems_message_queue_create(), the
+ * message queues constructed by this directive use a user-provided message
+ * buffer storage area.
+ *
+ * This directive is intended for applications which do not want to use the
+ * RTEMS Workspace and instead statically allocate all operating system
+ * resources. An application based solely on static allocation can avoid any
+ * runtime memory allocators. This can simplify the application architecture
+ * as well as any analysis that may be required.
+ *
+ * The value for #CONFIGURE_MESSAGE_BUFFER_MEMORY should not include memory for
+ * message queues constructed by rtems_message_queue_construct().
+ * @endparblock
+ *
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
+ *
+ * * The directive may be called from within device driver initialization
+ * context.
+ *
+ * * The directive may be called from within task context.
+ *
+ * * The directive may obtain and release the object allocator mutex. This may
+ * cause the calling task to be preempted.
+ *
+ * * When the directive operates on a global object, the directive sends a
+ * message to remote nodes. This may preempt the calling task.
+ *
+ * * The number of message queues available to the application is configured
+ * through the #CONFIGURE_MAXIMUM_MESSAGE_QUEUES application configuration
+ * option.
+ *
+ * * Where the object class corresponding to the directive is configured to use
+ * unlimited objects, the directive may allocate memory from the RTEMS
+ * Workspace.
+ *
+ * * The number of global objects available to the application is configured
+ * through the #CONFIGURE_MP_MAXIMUM_GLOBAL_OBJECTS application configuration
+ * option.
+ * @endparblock
*/
rtems_status_code rtems_message_queue_construct(
const rtems_message_queue_config *config,
rtems_id *id
);
-/**
- * @brief RTEMS Create Message Queue
- *
- * This routine implements the rtems_message_queue_create directive. The
- * message queue will have the @a name. If the @a attribute_set indicates
- * that the message queue is to be limited in the number of messages
- * that can be outstanding, then @a count indicates the maximum number of
- * messages that will be held. It returns the id of the created
- * message queue in @a id.
- *
- * @param[in] name is the user defined queue name
- * @param[in] count is the maximum message and reserved buffer count
- * @param[in] max_message_size is the maximum size of each message
- * @param[in] attribute_set is the process method
- * @param[in] id is the pointer to queue
- *
- * @retval This method returns RTEMS_SUCCESSFUL if there was not an
- * error. Otherwise, a status code is returned indicating the
- * source of the error. If successful, the @a id will
- * be filled in with the queue id.
- */
-rtems_status_code rtems_message_queue_create(
- rtems_name name,
- uint32_t count,
- size_t max_message_size,
- rtems_attribute attribute_set,
- rtems_id *id
-);
+/* Generated from spec:/rtems/message/if/ident */
/**
- * @brief RTEMS Message Queue Name to Id
- *
- * This routine implements the rtems_message_queue_ident directive.
- * This directive returns the message queue ID associated with NAME.
- * If more than one message queue is named name, then the message
- * queue to which the ID belongs is arbitrary. node indicates the
- * extent of the search for the ID of the message queue named name.
- * The search can be limited to a particular node or allowed to
- * encompass all nodes.
- *
- * @param[in] name is the user defined message queue name
- * @param[in] node is the node(s) to be searched
- * @param[in] id is the pointer to message queue id
- *
- * @retval RTEMS_SUCCESSFUL if successful or error code if unsuccessful and
- * *id filled with the message queue id
+ * @ingroup RTEMSAPIClassicMessage
+ *
+ * @brief Identifies a message queue by the object name.
+ *
+ * @param name is the object name to look up.
+ *
+ * @param node is the node or node set to search for a matching object.
+ *
+ * @param[out] id is the pointer to an object identifier variable. When the
+ * directive call is successful, the object identifier of an object with the
+ * specified name will be stored in this variable.
+ *
+ * This directive obtains a message queue identifier associated with the
+ * message queue name specified in ``name``.
+ *
+ * The node to search is specified in ``node``. It shall be
+ *
+ * * a valid node number,
+ *
+ * * the constant #RTEMS_SEARCH_ALL_NODES to search in all nodes,
+ *
+ * * the constant #RTEMS_SEARCH_LOCAL_NODE to search in the local node only, or
+ *
+ * * the constant #RTEMS_SEARCH_OTHER_NODES to search in all nodes except the
+ * local node.
+ *
+ * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``id`` parameter was NULL.
+ *
+ * @retval ::RTEMS_INVALID_NAME The ``name`` parameter was 0.
+ *
+ * @retval ::RTEMS_INVALID_NAME There was no object with the specified name on
+ * the specified nodes.
+ *
+ * @retval ::RTEMS_INVALID_NODE In multiprocessing configurations, the
+ * specified node was invalid.
+ *
+ * @par Notes
+ * @parblock
+ * If the message queue name is not unique, then the message queue identifier
+ * will match the first message queue with that name in the search order.
+ * However, this message queue identifier is not guaranteed to correspond to
+ * the desired message queue.
+ *
+ * The objects are searched from lowest to the highest index. If ``node`` is
+ * #RTEMS_SEARCH_ALL_NODES, all nodes are searched with the local node being
+ * searched first. All other nodes are searched from lowest to the highest
+ * node number.
+ *
+ * If node is a valid node number which does not represent the local node, then
+ * only the message queues exported by the designated node are searched.
+ *
+ * This directive does not generate activity on remote nodes. It accesses only
+ * the local copy of the global object table.
+ *
+ * The message queue identifier is used with other message related directives
+ * to access the message queue.
+ * @endparblock
+ *
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
+ *
+ * * The directive may be called from within any runtime context.
+ *
+ * * The directive will not cause the calling task to be preempted.
+ * @endparblock
*/
rtems_status_code rtems_message_queue_ident(
- rtems_name name,
- uint32_t node,
- rtems_id *id
+ rtems_name name,
+ uint32_t node,
+ rtems_id *id
);
+/* Generated from spec:/rtems/message/if/delete */
+
/**
- * @brief RTEMS Delete Message Queue
+ * @ingroup RTEMSAPIClassicMessage
*
- * This routine implements the rtems_message_queue_delete directive. The
- * message queue indicated by ID is deleted.
+ * @brief Deletes the message queue.
*
- * @param[in] id is the queue id
+ * @param id is the message queue identifier.
*
- * @retval RTEMS_SUCCESSFUL if successful or error code if unsuccessful
+ * This directive deletes the message queue specified by ``id``. As a result of
+ * this directive, all tasks blocked waiting to receive a message from this
+ * queue will be readied and returned a status code which indicates that the
+ * message queue was deleted.
+ *
+ * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
+ *
+ * @retval ::RTEMS_INVALID_ID There was no message queue associated with the
+ * identifier specified by ``id``.
+ *
+ * @retval ::RTEMS_ILLEGAL_ON_REMOTE_OBJECT The message queue resided on a
+ * remote node.
+ *
+ * @par Notes
+ * @parblock
+ * When the message queue is deleted, any messages in the queue are returned to
+ * the free message buffer pool. Any information stored in those messages is
+ * lost. The message buffers allocated for the message queue are reclaimed.
+ *
+ * The QCB for the deleted message queue is reclaimed by RTEMS.
+ *
+ * When a global message queue is deleted, the message queue identifier must be
+ * transmitted to every node in the system for deletion from the local copy of
+ * the global object table.
+ *
+ * The message queue must reside on the local node, even if the message queue
+ * was created with the #RTEMS_GLOBAL attribute.
+ *
+ * Proxies, used to represent remote tasks, are reclaimed when the message
+ * queue is deleted.
+ * @endparblock
+ *
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
+ *
+ * * The directive may be called from within device driver initialization
+ * context.
+ *
+ * * The directive may be called from within task context.
+ *
+ * * The directive may obtain and release the object allocator mutex. This may
+ * cause the calling task to be preempted.
+ *
+ * * When the directive operates on a global object, the directive sends a
+ * message to remote nodes. This may preempt the calling task.
+ *
+ * * The calling task does not have to be the task that created the object.
+ * Any local task that knows the object identifier can delete the object.
+ *
+ * * Where the object class corresponding to the directive is configured to use
+ * unlimited objects, the directive may free memory to the RTEMS Workspace.
+ * @endparblock
*/
-rtems_status_code rtems_message_queue_delete(
- rtems_id id
-);
+rtems_status_code rtems_message_queue_delete( rtems_id id );
+
+/* Generated from spec:/rtems/message/if/send */
/**
- * @brief Sends a message to the message queue.
- *
- * This directive sends the message buffer to the message queue indicated by
- * ID. If one or more tasks is blocked waiting to receive a message from this
- * message queue, then one will receive the message. The task selected to
- * receive the message is based on the task queue discipline algorithm in use
- * by this particular message queue. If no tasks are waiting, then the message
- * buffer will be placed at the rear of the chain of pending messages for this
- * message queue.
- *
- * @param id The message queue ID.
- * @param buffer The message content buffer.
- * @param size The size of the message.
- *
- * @retval RTEMS_SUCCESSFUL Successful operation.
- * @retval RTEMS_INVALID_ID Invalid message queue ID.
- * @retval RTEMS_INVALID_ADDRESS The message buffer pointer is @c NULL.
- * @retval RTEMS_INVALID_SIZE The message size is larger than the maximum
- * message size of the message queue.
- * @retval RTEMS_TOO_MANY The new message would exceed the message queue limit
- * for pending messages.
+ * @ingroup RTEMSAPIClassicMessage
+ *
+ * @brief Puts the message at the rear of the queue.
+ *
+ * @param id is the queue identifier.
+ *
+ * @param buffer is the begin address of the message buffer to send.
+ *
+ * @param size is the size in bytes of the message buffer to send.
+ *
+ * This directive sends the message ``buffer`` of ``size`` bytes in length to
+ * the queue specified by ``id``. If a task is waiting at the queue, then the
+ * message is copied to the waiting task's buffer and the task is unblocked. If
+ * no tasks are waiting at the queue, then the message is copied to a message
+ * buffer which is obtained from this message queue's message buffer pool. The
+ * message buffer is then placed at the rear of the queue.
+ *
+ * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
+ *
+ * @retval ::RTEMS_INVALID_ID There was no queue associated with the identifier
+ * specified by ``id``.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``buffer`` parameter was NULL.
+ *
+ * @retval ::RTEMS_INVALID_SIZE The size of the message exceeded the maximum
+ * message size of the queue as defined by rtems_message_queue_create() or
+ * rtems_message_queue_construct().
+ *
+ * @retval ::RTEMS_TOO_MANY The maximum number of pending messages supported by
+ * the queue as defined by rtems_message_queue_create() or
+ * rtems_message_queue_construct() has been reached.
+ *
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
+ *
+ * * The directive may be called from within task context.
+ *
+ * * The directive may be called from within interrupt context.
+ *
+ * * The directive may unblock another task which may preempt the calling task.
+ *
+ * * When the directive operates on a remote object, the directive sends a
+ * message to the remote node and waits for a reply. This will preempt the
+ * calling task.
+ * @endparblock
*/
rtems_status_code rtems_message_queue_send(
rtems_id id,
@@ -263,20 +576,55 @@ rtems_status_code rtems_message_queue_send(
size_t size
);
+/* Generated from spec:/rtems/message/if/urgent */
+
/**
- * @brief RTEMS Urgent Message Queue
+ * @ingroup RTEMSAPIClassicMessage
+ *
+ * @brief Puts the message at the front of the queue.
+ *
+ * @param id is the queue identifier.
+ *
+ * @param buffer is the begin address of the message buffer to send urgently.
+ *
+ * @param size is the size in bytes of the message buffer to send urgently.
+ *
+ * This directive sends the message ``buffer`` of ``size`` bytes in length to
+ * the queue specified by ``id``. If a task is waiting at the queue, then the
+ * message is copied to the waiting task's buffer and the task is unblocked. If
+ * no tasks are waiting at the queue, then the message is copied to a message
+ * buffer which is obtained from this message queue's message buffer pool. The
+ * message buffer is then placed at the front of the queue.
+ *
+ * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
+ *
+ * @retval ::RTEMS_INVALID_ID There was no queue associated with the identifier
+ * specified by ``id``.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``buffer`` parameter was NULL.
+ *
+ * @retval ::RTEMS_INVALID_SIZE The size of the message exceeded the maximum
+ * message size of the queue as defined by rtems_message_queue_create() or
+ * rtems_message_queue_construct().
+ *
+ * @retval ::RTEMS_TOO_MANY The maximum number of pending messages supported by
+ * the queue as defined by rtems_message_queue_create() or
+ * rtems_message_queue_construct() has been reached.
+ *
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
*
- * This routine implements the rtems_message_queue_urgent directive.
- * This directive has the same behavior as rtems_message_queue_send
- * except that if no tasks are waiting, the message buffer will
- * be placed at the FRONT of the chain of pending messages rather
- * than at the REAR.
+ * * The directive may be called from within task context.
*
- * @param[in] id is the pointer to message queue
- * @param[in] buffer is the pointer to message buffer
- * @param[in] size is the size of message to send urgently
+ * * The directive may be called from within interrupt context.
*
- * @retval RTEMS_SUCCESSFUL if successful or error code if unsuccessful
+ * * The directive may unblock another task which may preempt the calling task.
+ *
+ * * When the directive operates on a remote object, the directive sends a
+ * message to the remote node and waits for a reply. This will preempt the
+ * calling task.
+ * @endparblock
*/
rtems_status_code rtems_message_queue_urgent(
rtems_id id,
@@ -284,21 +632,61 @@ rtems_status_code rtems_message_queue_urgent(
size_t size
);
+/* Generated from spec:/rtems/message/if/broadcast */
+
/**
- * @brief RTEMS Broadcast Message Queue
+ * @ingroup RTEMSAPIClassicMessage
+ *
+ * @brief Broadcasts the messages to the tasks waiting at the queue.
+ *
+ * @param id is the queue identifier.
+ *
+ * @param buffer is the begin address of the message buffer to broadcast.
+ *
+ * @param size is the size in bytes of the message buffer to broadcast.
+ *
+ * @param[out] count is the pointer to an uint32_t variable. When the
+ * directive call is successful, the number of unblocked tasks will be stored
+ * in this variable.
+ *
+ * This directive causes all tasks that are waiting at the queue specified by
+ * ``id`` to be unblocked and sent the message contained in ``buffer``. Before
+ * a task is unblocked, the message ``buffer`` of ``size`` byes in length is
+ * copied to that task's message buffer. The number of tasks that were
+ * unblocked is returned in ``count``.
+ *
+ * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
+ *
+ * @retval ::RTEMS_INVALID_ID There was no queue associated with the identifier
+ * specified by ``id``.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``buffer`` parameter was NULL.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``count`` parameter was NULL.
+ *
+ * @retval ::RTEMS_INVALID_SIZE The size of the message exceeded the maximum
+ * message size of the queue as defined by rtems_message_queue_create() or
+ * rtems_message_queue_construct().
+ *
+ * @par Notes
+ * The execution time of this directive is directly related to the number of
+ * tasks waiting on the message queue, although it is more efficient than the
+ * equivalent number of invocations of rtems_message_queue_send().
*
- * This routine implements the rtems_message_queue_broadcast directive.
- * This directive sends the message buffer to all of the tasks blocked
- * waiting for a message on the message queue indicated by ID.
- * If no tasks are waiting, then the message buffer will not be queued.
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
*
- * @param[in] id is the pointer to message queue
- * @param[in] buffer is the pointer to message buffer
- * @param[in] size is the size of message to broadcast
- * @param[in] count pointer to area to store number of threads made ready
+ * * The directive may be called from within task context.
*
- * @retval RTEMS_SUCCESSFUL if successful or error code if unsuccessful and
- * *count filled in with number of threads made ready
+ * * The directive may be called from within interrupt context.
+ *
+ * * The directive may unblock another task which may preempt the calling task.
+ *
+ * * When the directive operates on a remote object, the directive sends a
+ * message to the remote node and waits for a reply. This will preempt the
+ * calling task.
+ * @endparblock
*/
rtems_status_code rtems_message_queue_broadcast(
rtems_id id,
@@ -307,72 +695,221 @@ rtems_status_code rtems_message_queue_broadcast(
uint32_t *count
);
+/* Generated from spec:/rtems/message/if/receive */
+
/**
- * @brief Receives a message from the message queue
- *
- * This directive is invoked when the calling task wishes to receive a message
- * from the message queue indicated by ID. The received message is to be placed
- * in the buffer. If no messages are outstanding and the option set indicates
- * that the task is willing to block, then the task will be blocked until a
- * message arrives or until, optionally, timeout clock ticks have passed.
- *
- * @param id The message queue ID.
- * @param[out] buffer The buffer for the message content. The buffer must be
- * large enough to store maximum size messages of this message queue.
- * @param[out] size The size of the message.
- * @param option_set The option set, e.g. RTEMS_NO_WAIT or RTEMS_WAIT.
- * @param timeout The number of ticks to wait if the RTEMS_WAIT is set. Use
- * RTEMS_NO_TIMEOUT to wait indefinitely.
- *
- * @retval RTEMS_SUCCESSFUL Successful operation.
- * @retval RTEMS_INVALID_ID Invalid message queue ID.
- * @retval RTEMS_INVALID_ADDRESS The message buffer pointer or the message size
- * pointer is @c NULL.
- * @retval RTEMS_TIMEOUT A timeout occurred and no message was received.
+ * @ingroup RTEMSAPIClassicMessage
+ *
+ * @brief Receives a message from the queue.
+ *
+ * @param id is the queue identifier.
+ *
+ * @param buffer is the begin address of the buffer to receive the message.
+ * The buffer shall be large enough to receive a message of the maximum
+ * length of the queue as defined by rtems_message_queue_create() or
+ * rtems_message_queue_construct(). The ``size`` parameter cannot be used to
+ * specify the size of the buffer.
+ *
+ * @param size is the pointer to a size_t variable. When the directive call is
+ * successful, the size in bytes of the received messages will be stored in
+ * this variable. This parameter cannot be used to specify the size of the
+ * buffer.
+ *
+ * @param option_set is the option set.
+ *
+ * @param timeout is the timeout in clock ticks if the #RTEMS_WAIT option is
+ * set. Use #RTEMS_NO_TIMEOUT to wait potentially forever.
+ *
+ * This directive receives a message from the queue specified by ``id``.
+ *
+ * The **option set** specified in ``option_set`` is built through a *bitwise
+ * or* of the option constants described below. Not all combinations of
+ * options are allowed. Some options are mutually exclusive. If mutually
+ * exclusive options are combined, the behaviour is undefined. Options not
+ * mentioned below are not evaluated by this directive and have no effect.
+ * Default options can be selected by using the #RTEMS_DEFAULT_OPTIONS
+ * constant.
+ *
+ * The calling task can **wait** or **try to receive** a message from the queue
+ * according to the mutually exclusive #RTEMS_WAIT and #RTEMS_NO_WAIT options.
+ *
+ * * **Waiting to receive** a message from the queue is the default and can be
+ * emphasized through the use of the #RTEMS_WAIT option. The ``timeout``
+ * parameter defines how long the calling task is willing to wait. Use
+ * #RTEMS_NO_TIMEOUT to wait potentially forever, otherwise set a timeout
+ * interval in clock ticks.
+ *
+ * * **Trying to receive** a message from the queue is selected by the
+ * #RTEMS_NO_WAIT option. If this option is defined, then the ``timeout``
+ * parameter is ignored. When a message from the queue cannot be immediately
+ * received, then the ::RTEMS_UNSATISFIED status is returned.
+ *
+ * With either #RTEMS_WAIT or #RTEMS_NO_WAIT if there is at least one message
+ * in the queue, then it is copied to the buffer, the size is set to return the
+ * length of the message in bytes, and this directive returns immediately with
+ * the ::RTEMS_SUCCESSFUL status code. The buffer has to be big enough to
+ * receive a message of the maximum length with respect to this message queue.
+ *
+ * If the calling task chooses to return immediately and the queue is empty,
+ * then the directive returns immediately with the ::RTEMS_UNSATISFIED status
+ * cod. If the calling task chooses to wait at the message queue and the queue
+ * is empty, then the calling task is placed on the message wait queue and
+ * blocked. If the queue was created with the #RTEMS_PRIORITY option
+ * specified, then the calling task is inserted into the wait queue according
+ * to its priority. But, if the queue was created with the #RTEMS_FIFO option
+ * specified, then the calling task is placed at the rear of the wait queue.
+ *
+ * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
+ *
+ * @retval ::RTEMS_INVALID_ID There was no queue associated with the identifier
+ * specified by ``id``.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``buffer`` parameter was NULL.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``size`` parameter was NULL.
+ *
+ * @retval ::RTEMS_UNSATISFIED The queue was empty.
+ *
+ * @retval ::RTEMS_UNSATISFIED The queue was flushed while the calling task was
+ * waiting to receive a message.
+ *
+ * @retval ::RTEMS_TIMEOUT The timeout happened while the calling task was
+ * waiting to receive a message
+ *
+ * @retval ::RTEMS_OBJECT_WAS_DELETED The queue was deleted while the calling
+ * task was waiting to receive a message.
+ *
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
+ *
+ * * When a local queue is accessed and the #RTEMS_NO_WAIT option is set, the
+ * directive may be called from within interrupt context.
+ *
+ * * The directive may be called from within task context.
+ *
+ * * When the request cannot be immediately satisfied and the #RTEMS_WAIT
+ * option is set, the calling task blocks at some point during the directive
+ * call.
+ *
+ * * The timeout functionality of the directive requires a clock tick.
+ *
+ * * When the directive operates on a remote object, the directive sends a
+ * message to the remote node and waits for a reply. This will preempt the
+ * calling task.
+ * @endparblock
*/
rtems_status_code rtems_message_queue_receive(
- rtems_id id,
- void *buffer,
- size_t *size,
- rtems_option option_set,
- rtems_interval timeout
+ rtems_id id,
+ void *buffer,
+ size_t *size,
+ rtems_option option_set,
+ rtems_interval timeout
);
+/* Generated from spec:/rtems/message/if/get-number-pending */
+
/**
- * @brief rtems_message_queue_flush
+ * @ingroup RTEMSAPIClassicMessage
+ *
+ * @brief Gets the number of messages pending on the queue.
*
- * This routine implements the rtems_message_queue_flush directive.
- * This directive takes all outstanding messages for the message
- * queue indicated by ID and returns them to the inactive message
- * chain. The number of messages flushed is returned in COUNT.
+ * @param id is the queue identifier.
+ *
+ * @param[out] count is the pointer to an uint32_t variable. When the
+ * directive call is successful, the number of pending messages will be
+ * stored in this variable.
+ *
+ * This directive returns the number of messages pending on the queue specified
+ * by ``id`` in ``count``. If no messages are present on the queue, count is
+ * set to zero.
+ *
+ * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
*
- * Message Queue Manager
+ * @retval ::RTEMS_INVALID_ID There was no queue associated with the identifier
+ * specified by ``id``.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``count`` parameter was NULL.
+ *
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
+ *
+ * * The directive may be called from within task context.
+ *
+ * * The directive may be called from within interrupt context.
+ *
+ * * When the directive operates on a remote object, the directive sends a
+ * message to the remote node and waits for a reply. This will preempt the
+ * calling task.
+ * @endparblock
*/
-rtems_status_code rtems_message_queue_flush(
+rtems_status_code rtems_message_queue_get_number_pending(
rtems_id id,
uint32_t *count
);
+/* Generated from spec:/rtems/message/if/flush */
+
/**
- * @brief RTEMS Message Queue Get Number Pending
+ * @ingroup RTEMSAPIClassicMessage
*
- * Message Queue Manager
+ * @brief Flushes all messages on the queue.
*
- * This routine implements the rtems_message_queue_get_number_pending
- * directive. This directive returns the number of pending
- * messages for the message queue indicated by ID
- * chain. The number of messages pending is returned in COUNT.
+ * @param id is the queue identifier.
+ *
+ * @param[out] count is the pointer to an uint32_t variable. When the
+ * directive call is successful, the number of unblocked tasks will be stored
+ * in this variable.
+ *
+ * This directive removes all pending messages from the queue specified by
+ * ``id``. The number of messages removed is returned in ``count``. If no
+ * messages are present on the queue, count is set to zero.
+ *
+ * @retval ::RTEMS_SUCCESSFUL The requested operation was successful.
+ *
+ * @retval ::RTEMS_INVALID_ID There was no queue associated with the identifier
+ * specified by ``id``.
+ *
+ * @retval ::RTEMS_INVALID_ADDRESS The ``count`` parameter was NULL.
+ *
+ * @par Constraints
+ * @parblock
+ * The following constraints apply to this directive:
+ *
+ * * The directive may be called from within task context.
+ *
+ * * The directive may be called from within interrupt context.
+ *
+ * * When the directive operates on a remote object, the directive sends a
+ * message to the remote node and waits for a reply. This will preempt the
+ * calling task.
+ * @endparblock
*/
-rtems_status_code rtems_message_queue_get_number_pending(
- rtems_id id,
- uint32_t *count
-);
+rtems_status_code rtems_message_queue_flush( rtems_id id, uint32_t *count );
-/**@}*/
+/* Generated from spec:/rtems/message/if/buffer */
+
+/**
+ * @ingroup RTEMSAPIClassicMessage
+ *
+ * @brief Defines a structure which can be used as a message queue buffer for
+ * messages of the specified maximum size.
+ *
+ * @param _maximum_message_size is the maximum message size in bytes.
+ *
+ * @par Notes
+ * Use this macro to define the message buffer storage area for
+ * rtems_message_queue_construct().
+ */
+#define RTEMS_MESSAGE_QUEUE_BUFFER( _maximum_message_size ) \
+ struct { \
+ CORE_message_queue_Buffer _buffer; \
+ char _message[ _maximum_message_size ]; \
+ }
#ifdef __cplusplus
}
#endif
-#endif
-/* end of include file */
+#endif /* _RTEMS_RTEMS_MESSAGE_H */