112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/****************************************************************************
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* sched/mqueue/mq_waitirq.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 <sched.h>
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#include <assert.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: nxmq_wait_irq
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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 and friends) or not empty (on mq_receive
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* and friends).
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*
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* Input 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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* Returned 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 nxmq_wait_irq(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 waitobj,
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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->waitobj;
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DEBUGASSERT(msgq);
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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 error value for the thread. */
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wtcb->errcode = 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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