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159 lines
5.0 KiB
159 lines
5.0 KiB
/**************************************************************************** |
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* sched/mq_descreate.c |
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* |
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* Copyright (C) 2007-2009 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 "os_internal.h" |
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#include "sig_internal.h" |
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#include "mq_internal.h" |
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/**************************************************************************** |
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* Definitions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Type Declarations |
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****************************************************************************/ |
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/**************************************************************************** |
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* Global Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: mq_desalloc |
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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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* Inputs: |
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* None |
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* |
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* Return 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 mq_desalloc(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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mq_desblockalloc(); |
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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: mq_descreate |
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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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* Inputs: |
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* TCB - 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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* Return 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 mq_descreate(FAR _TCB* mtcb, FAR msgq_t* msgq, int oflags) |
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{ |
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mqd_t mqdes; |
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/* Create a message queue descriptor for the TCB */ |
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mqdes = mq_desalloc(); |
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if (mqdes) |
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{ |
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/* Initialize the MQ 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 tasks's TCB */ |
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sq_addlast((FAR sq_entry_t*)mqdes, &mtcb->msgdesq); |
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} |
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return mqdes; |
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}
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