125 lines
4.6 KiB
C
125 lines
4.6 KiB
C
/****************************************************************************
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* include/nuttx/mqueue.h
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*
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef ___INCLUDE_NUTTX_MQUEUE_H
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#define ___INCLUDE_NUTTX_MQUEUE_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <mqueue.h>
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#include <queue.h>
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#include <signal.h>
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#if CONFIG_MQ_MAXMSGSIZE > 0
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Global Type Declarations
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****************************************************************************/
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/* This structure defines a message queue */
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struct mq_des; /* forward reference */
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struct msgq_s
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{
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FAR struct msgq_s *flink; /* Forward link to next message queue */
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sq_queue_t msglist; /* Prioritized message list */
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int16_t maxmsgs; /* Maximum number of messages in the queue */
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int16_t nmsgs; /* Number of message in the queue */
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int16_t nconnect; /* Number of connections to message queue */
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int16_t nwaitnotfull; /* Number tasks waiting for not full */
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int16_t nwaitnotempty; /* Number tasks waiting for not empty */
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uint8_t maxmsgsize; /* Max size of message in message queue */
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bool unlinked; /* true if the msg queue has been unlinked */
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#ifndef CONFIG_DISABLE_SIGNALS
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FAR struct mq_des *ntmqdes; /* Notification: Owning mqdes (NULL if none) */
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pid_t ntpid; /* Notification: Receiving Task's PID */
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int ntsigno; /* Notification: Signal number */
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union sigval ntvalue; /* Notification: Signal value */
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#endif
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char name[1]; /* Start of the queue name */
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};
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typedef struct msgq_s msgq_t;
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#define SIZEOF_MQ_HEADER ((int)(((msgq_t*)NULL)->name))
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/* This describes the message queue descriptor that is held in the
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* task's TCB
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*/
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struct mq_des
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{
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FAR struct mq_des *flink; /* Forward link to next message descriptor */
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FAR msgq_t *msgq; /* Pointer to associated message queue */
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int oflags; /* Flags set when message queue was opened */
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};
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Global Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_MQ_MAXMSGSIZE > 0 */
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#endif /* ___INCLUDE_NUTTX_MQUEUE_H */
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