110 lines
4.3 KiB
C
110 lines
4.3 KiB
C
/********************************************************************************
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* include/mqueue.h
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*
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* Copyright (C) 2007, 2008 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_MQUEUE_H
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#define __INCLUDE_MQUEUE_H
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <sys/types.h>
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#include <signal.h>
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#include "queue.h"
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/********************************************************************************
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* Pre-processor Definitions
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********************************************************************************/
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#define MQ_NONBLOCK O_NONBLOCK
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/********************************************************************************
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* Public Type Declarations
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********************************************************************************/
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/* Message queue attributes */
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struct mq_attr
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{
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size_t mq_maxmsg; /* Max number of messages in queue */
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size_t mq_msgsize; /* Max message size */
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unsigned mq_flags; /* Queue flags */
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size_t mq_curmsgs; /* Number of messages currently in queue */
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};
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/* Message queue descriptor */
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typedef FAR struct mq_des *mqd_t;
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/********************************************************************************
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* Public Data
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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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{
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#else
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#define EXTERN extern
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#endif
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/********************************************************************************
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* Public Function Prototypes
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********************************************************************************/
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mqd_t mq_open(FAR const char *mq_name, int oflags, ...);
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int mq_close(mqd_t mqdes);
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int mq_unlink(FAR const char *mq_name);
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int mq_send(mqd_t mqdes, FAR const char *msg, size_t msglen,
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unsigned int prio);
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int mq_timedsend(mqd_t mqdes, FAR const char *msg, size_t msglen,
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unsigned int prio, FAR const struct timespec *abstime);
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ssize_t mq_receive(mqd_t mqdes, FAR char *msg, size_t msglen,
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FAR unsigned int *prio);
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ssize_t mq_timedreceive(mqd_t mqdes, FAR char *msg, size_t msglen,
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FAR unsigned int *prio,
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FAR const struct timespec *abstime);
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int mq_notify(mqd_t mqdes, FAR const struct sigevent *notification);
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int mq_setattr(mqd_t mqdes, FAR const struct mq_attr *mq_stat,
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FAR struct mq_attr *oldstat);
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int mq_getattr(mqd_t mqdes, FAR struct mq_attr *mq_stat);
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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 /* __INCLUDE_MQUEUE_H */
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