157 lines
4.6 KiB
C
157 lines
4.6 KiB
C
/****************************************************************************
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* sched/mqueue/mq_descreate.c
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*
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* Copyright (C) 2007-2009, 2013, 2016 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 <stdarg.h>
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#include <unistd.h>
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#include <string.h>
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#include <assert.h>
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#include <mqueue.h>
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#include <sched.h>
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#include <queue.h>
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#include <debug.h>
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#include <nuttx/arch.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 "mqueue/mqueue.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxmq_alloc_des
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*
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* Description:
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* Allocate a message queue descriptor.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* Reference to the allocated mq descriptor.
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*
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****************************************************************************/
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static mqd_t nxmq_alloc_des(void)
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{
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mqd_t mqdes;
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/* Try to get the message descriptorfrom the free list */
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mqdes = (mqd_t)sq_remfirst(&g_desfree);
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/* Check if we got one. */
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if (!mqdes)
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{
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/* Add another block of message descriptors to the list */
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nxmq_alloc_desblock();
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/* And try again */
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mqdes = (mqd_t)sq_remfirst(&g_desfree);
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}
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return mqdes;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxmq_create_des
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*
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* Description:
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* Create a message queue descriptor for the specified TCB
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*
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* Input Parameters:
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* mtcb - task that needs the descriptor.
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* msgq - Named message queue containing the message
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* oflags - access rights for the descriptor
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*
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* Returned Value:
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* On success, the message queue descriptor is returned. NULL is returned
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* on a failure to allocate.
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*
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****************************************************************************/
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mqd_t nxmq_create_des(FAR struct tcb_s *mtcb,
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FAR struct mqueue_inode_s *msgq, int oflags)
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{
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FAR struct task_group_s *group;
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mqd_t mqdes;
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/* A NULL TCB pointer means to use the TCB of the currently executing
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* task/thread.
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*/
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if (!mtcb)
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{
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mtcb = sched_self();
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}
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group = mtcb->group;
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DEBUGASSERT(group);
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/* Create a message queue descriptor for the TCB */
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mqdes = nxmq_alloc_des();
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if (mqdes)
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{
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/* Initialize the message queue descriptor */
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memset(mqdes, 0, sizeof(struct mq_des));
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mqdes->msgq = msgq;
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mqdes->oflags = oflags;
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/* And add it to the specified task's TCB */
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sq_addlast((FAR sq_entry_t *)mqdes, &group->tg_msgdesq);
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}
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return mqdes;
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}
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