118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/****************************************************************************
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* sched/mqueue/mq_msgqalloc.c
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*
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* Copyright (C) 2014 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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/****************************************************************************
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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: mq_msgqalloc
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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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* 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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* Return 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 *mq_msgqalloc(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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#ifndef CONFIG_DISABLE_SIGNALS
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msgq->ntpid = INVALID_PROCESS_ID;
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#endif
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}
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return msgq;
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}
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