119 lines
4.4 KiB
C
119 lines
4.4 KiB
C
/************************************************************************
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* sched/mq_recover.c
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*
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* Copyright (C) 2012 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 <assert.h>
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#include <nuttx/mqueue.h>
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#include <nuttx/sched.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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* Public Functions
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************************************************************************/
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/************************************************************************
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* Name: mq_recover
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*
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* Description:
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* This function is called when a task is deleted via task_deleted or
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* via pthread_cancel. I checks if the task was waiting for a message
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* queue event and adjusts counts appropriately.
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*
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* Inputs:
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* tcb - The TCB of the terminated task or thread
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*
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* Return Value:
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* None.
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*
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* Assumptions:
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* This function is called from task deletion logic in a safe context.
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*
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************************************************************************/
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void mq_recover(FAR struct tcb_s *tcb)
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{
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/* If were were waiting for a timed message queue event, then the
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* timer was canceled and deleted in task_recover() before this
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* function was called.
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*/
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/* Was the task waiting for a message queue to become non-empty? */
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if (tcb->task_state == TSTATE_WAIT_MQNOTEMPTY)
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{
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/* Decrement the count of waiters */
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DEBUGASSERT(tcb->msgwaitq && tcb->msgwaitq->nwaitnotempty > 0);
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tcb->msgwaitq->nwaitnotempty--;
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}
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/* Was the task waiting for a message queue to become non-full? */
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else if (tcb->task_state == TSTATE_WAIT_MQNOTFULL)
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{
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/* Decrement the count of waiters */
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DEBUGASSERT(tcb->msgwaitq && tcb->msgwaitq->nwaitnotfull > 0);
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tcb->msgwaitq->nwaitnotfull--;
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}
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}
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