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Diffstat (limited to 'nuttx/sched/mq_descreate.c')
-rw-r--r-- | nuttx/sched/mq_descreate.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/nuttx/sched/mq_descreate.c b/nuttx/sched/mq_descreate.c new file mode 100644 index 000000000..14937888c --- /dev/null +++ b/nuttx/sched/mq_descreate.c @@ -0,0 +1,159 @@ +/**************************************************************************** + * sched/mq_descreate.c + * + * Copyright (C) 2007-2009 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 <stdarg.h> +#include <unistd.h> +#include <string.h> +#include <assert.h> +#include <mqueue.h> +#include <sched.h> +#include <queue.h> +#include <debug.h> + +#include <nuttx/arch.h> +#include <nuttx/kmalloc.h> + +#include "os_internal.h" +#include "sig_internal.h" + +#include "mq_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: mq_desalloc + * + * Description: + * Allocate a message queue descriptor. + * + * Inputs: + * None + * + * Return Value: + * Reference to the allocated mq descriptor. + * + ****************************************************************************/ + +static mqd_t mq_desalloc(void) +{ + mqd_t mqdes; + + /* Try to get the message descriptorfrom the free list */ + + mqdes = (mqd_t)sq_remfirst(&g_desfree); + + /* Check if we got one. */ + + if (!mqdes) + { + /* Add another block of message descriptors to the list */ + + mq_desblockalloc(); + + /* And try again */ + + mqdes = (mqd_t)sq_remfirst(&g_desfree); + } + + return mqdes; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: mq_descreate + * + * Description: + * Create a message queue descriptor for the specified TCB + * + * Inputs: + * TCB - task that needs the descriptor. + * msgq - Named message queue containing the message + * oflags - access rights for the descriptor + * + * Return Value: + * On success, the message queue descriptor is returned. NULL is returned + * on a failure to allocate. + * + ****************************************************************************/ + +mqd_t mq_descreate(FAR _TCB* mtcb, FAR msgq_t* msgq, int oflags) +{ + mqd_t mqdes; + + /* Create a message queue descriptor for the TCB */ + + mqdes = mq_desalloc(); + if (mqdes) + { + /* Initialize the MQ descriptor */ + + memset(mqdes, 0, sizeof(struct mq_des)); + mqdes->msgq = msgq; + mqdes->oflags = oflags; + + /* And add it to the specified tasks's TCB */ + + sq_addlast((FAR sq_entry_t*)mqdes, &mtcb->msgdesq); + } + + return mqdes; +} |