127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/****************************************************************************
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* sched/mqueue/mq_waitirq.c
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*
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* Copyright (C) 2007-2009, 2011, 2014, 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 <sched.h>
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#include <errno.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mq_waitirq
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*
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* Description:
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* This function is called when a signal or a timeout is received by a
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* task that is waiting on a message queue -- either for a queue to
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* becoming not full (on mq_send) or not empty (on mq_receive).
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*
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* Parameters:
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* wtcb - A pointer to the TCB of the task that is waiting on a message
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* queue, but has received a signal instead.
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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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*
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****************************************************************************/
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void mq_waitirq(FAR struct tcb_s *wtcb, int errcode)
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{
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FAR struct mqueue_inode_s *msgq;
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irqstate_t flags;
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/* Disable interrupts. This is necessary because an interrupt handler may
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* attempt to send a message while we are doing this.
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*/
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flags = enter_critical_section();
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/* It is possible that an interrupt/context switch beat us to the punch and
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* already changed the task's state. NOTE: The operations within the if
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* are safe because interrupts are always disabled with the msgwaitq,
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* nwaitnotempty, and nwaitnotfull fields are modified.
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*/
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if (wtcb->task_state == TSTATE_WAIT_MQNOTEMPTY ||
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wtcb->task_state == TSTATE_WAIT_MQNOTFULL)
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{
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/* Get the message queue associated with the waiter from the TCB */
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msgq = wtcb->msgwaitq;
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DEBUGASSERT(msgq);
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wtcb->msgwaitq = NULL;
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/* Decrement the count of waiters and cancel the wait */
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if (wtcb->task_state == TSTATE_WAIT_MQNOTEMPTY)
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{
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DEBUGASSERT(msgq->nwaitnotempty > 0);
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msgq->nwaitnotempty--;
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}
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else
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{
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DEBUGASSERT(msgq->nwaitnotfull > 0);
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msgq->nwaitnotfull--;
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}
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/* Mark the errno value for the thread. */
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wtcb->pterrno = errcode;
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/* Restart the task. */
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up_unblock_task(wtcb);
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}
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/* Interrupts may now be enabled. */
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leave_critical_section(flags);
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}
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