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- /****************************************************************************
- * sched/mqueue/mq_msgqalloc.c
- *
- * Copyright (C) 2014, 2017 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <mqueue.h>
- #include <assert.h>
- #include <nuttx/kmalloc.h>
- #include <nuttx/sched.h>
- #include <nuttx/mqueue.h>
- #include "sched/sched.h"
- #include "mqueue/mqueue.h"
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxmq_alloc_msgq
- *
- * Description:
- * This function implements a part of the POSIX message queue open logic.
- * It allocates and initializes a struct mqueue_inode_s structure.
- *
- * Input Parameters:
- * mode - mode_t value is ignored
- * attr - The mq_maxmsg attribute is used at the time that the message
- * queue is created to determine the maximum number of
- * messages that may be placed in the message queue.
- *
- * Returned Value:
- * The allocated and initialized message queue structure or NULL in the
- * event of a failure.
- *
- ****************************************************************************/
- FAR struct mqueue_inode_s *nxmq_alloc_msgq(mode_t mode,
- FAR struct mq_attr *attr)
- {
- FAR struct mqueue_inode_s *msgq;
- /* Check if the caller is attempting to allocate a message for messages
- * larger than the configured maximum message size.
- */
- DEBUGASSERT(!attr || attr->mq_msgsize <= MQ_MAX_BYTES);
- if (attr && attr->mq_msgsize > MQ_MAX_BYTES)
- {
- return NULL;
- }
- /* Allocate memory for the new message queue. */
- msgq = (FAR struct mqueue_inode_s *)
- kmm_zalloc(sizeof(struct mqueue_inode_s));
- if (msgq)
- {
- /* Initialize the new named message queue */
- sq_init(&msgq->msglist);
- if (attr)
- {
- msgq->maxmsgs = (int16_t)attr->mq_maxmsg;
- msgq->maxmsgsize = (int16_t)attr->mq_msgsize;
- }
- else
- {
- msgq->maxmsgs = MQ_MAX_MSGS;
- msgq->maxmsgsize = MQ_MAX_BYTES;
- }
- msgq->ntpid = INVALID_PROCESS_ID;
- }
- return msgq;
- }
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