104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/****************************************************************************
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* sched/mqueue/mq_msgfree.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <assert.h>
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#include <queue.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/kmalloc.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: nxmq_free_msg
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*
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* Description:
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* The nxmq_free_msg function will return a message to the free pool of
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* messages if it was a pre-allocated message. If the message was
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* allocated dynamically it will be deallocated.
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*
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* Input Parameters:
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* mqmsg - message to free
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void nxmq_free_msg(FAR struct mqueue_msg_s *mqmsg)
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{
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irqstate_t flags;
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/* If this is a generally available pre-allocated message,
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* then just put it back in the free list.
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*/
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if (mqmsg->type == MQ_ALLOC_FIXED)
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{
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/* Make sure we avoid concurrent access to the free
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* list from interrupt handlers.
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*/
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flags = enter_critical_section();
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sq_addlast((FAR sq_entry_t *)mqmsg, &g_msgfree);
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leave_critical_section(flags);
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}
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/* If this is a message pre-allocated for interrupts,
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* then put it back in the correct free list.
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*/
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else if (mqmsg->type == MQ_ALLOC_IRQ)
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{
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/* Make sure we avoid concurrent access to the free
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* list from interrupt handlers.
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*/
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flags = enter_critical_section();
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sq_addlast((FAR sq_entry_t *)mqmsg, &g_msgfreeirq);
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leave_critical_section(flags);
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}
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/* Otherwise, deallocate it. Note: interrupt handlers
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* will never deallocate messages because they will not
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* received them.
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*/
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else if (mqmsg->type == MQ_ALLOC_DYN)
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{
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kmm_free(mqmsg);
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}
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else
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{
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DEBUGPANIC();
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}
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}
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