123 lines
3.9 KiB
C
123 lines
3.9 KiB
C
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/****************************************************************************
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* sched/mqueue/msg.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __SCHED_MQUEUE_MSG_H
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#define __SCHED_MQUEUE_MSG_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 <nuttx/irq.h>
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#include <nuttx/mqueue.h>
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#include <sys/msg.h>
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#include <errno.h>
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#if defined(CONFIG_MQ_MAXMSGSIZE) && CONFIG_MQ_MAXMSGSIZE > 0
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define MSG_MAX_BYTES CONFIG_MQ_MAXMSGSIZE
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#define MSG_MAX_MSGS 16
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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struct msgq_s
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{
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struct mqueue_cmn_s cmn;
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struct list_node msglist; /* Prioritized message list */
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key_t key;
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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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uint16_t maxmsgsize; /* Max size of message in message queue */
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};
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struct msgbuf_s
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{
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struct list_node node;
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uint16_t msize; /* Message data length */
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long mtype; /* Message type, must be > 0 */
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char mtext[MSG_MAX_BYTES]; /* Message data */
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};
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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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EXTERN struct list_node g_msgfreelist;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: nxmsg_alloc
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*
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* Description:
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* Allocate a message queue instance
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*
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****************************************************************************/
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int nxmsg_alloc(FAR struct msgq_s **pmsgq);
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/****************************************************************************
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* Name: nxmsg_free
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*
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* Description:
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* Free the message queue instance
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*
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****************************************************************************/
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void nxmsg_free(FAR struct msgq_s *msgq);
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/****************************************************************************
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* Name: nxmsg_lookup
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*
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* Description:
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* Find the message queue in look-up table
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*
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****************************************************************************/
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FAR struct msgq_s *nxmsg_lookup(key_t key);
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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 /* defined(CONFIG_MQ_MAXMSGSIZE) && CONFIG_MQ_MAXMSGSIZE > 0 */
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#endif /* __SCHED_MQUEUE_MSG_H */
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