101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/****************************************************************************
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* sched/mqueue/mq_msgqalloc.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <mqueue.h>
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#include <assert.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/sched.h>
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#include <nuttx/mqueue.h>
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#include "sched/sched.h"
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#include "mqueue/mqueue.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxmq_alloc_msgq
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*
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* Description:
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* This function implements a part of the POSIX message queue open logic.
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* It allocates and initializes a struct mqueue_inode_s structure.
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*
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* Input Parameters:
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* mode - mode_t value is ignored
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* attr - The mq_maxmsg attribute is used at the time that the message
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* queue is created to determine the maximum number of
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* messages that may be placed in the message queue.
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*
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* Returned Value:
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* The allocated and initialized message queue structure or NULL in the
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* event of a failure.
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*
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****************************************************************************/
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FAR struct mqueue_inode_s *nxmq_alloc_msgq(mode_t mode,
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FAR struct mq_attr *attr)
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{
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FAR struct mqueue_inode_s *msgq;
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/* Check if the caller is attempting to allocate a message for messages
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* larger than the configured maximum message size.
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*/
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DEBUGASSERT(!attr || attr->mq_msgsize <= MQ_MAX_BYTES);
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if (attr && attr->mq_msgsize > MQ_MAX_BYTES)
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{
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return NULL;
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}
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/* Allocate memory for the new message queue. */
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msgq = (FAR struct mqueue_inode_s *)
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kmm_zalloc(sizeof(struct mqueue_inode_s));
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if (msgq)
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{
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/* Initialize the new named message queue */
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sq_init(&msgq->msglist);
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if (attr)
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{
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msgq->maxmsgs = (int16_t)attr->mq_maxmsg;
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msgq->maxmsgsize = (int16_t)attr->mq_msgsize;
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}
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else
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{
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msgq->maxmsgs = MQ_MAX_MSGS;
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msgq->maxmsgsize = MQ_MAX_BYTES;
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}
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msgq->ntpid = INVALID_PROCESS_ID;
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}
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return msgq;
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}
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