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- /****************************************************************************
- * sched/mqueue/mq_waitirq.c
- *
- * Copyright (C) 2007-2009, 2011, 2014, 2016 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 <sched.h>
- #include <errno.h>
- #include <nuttx/irq.h>
- #include <nuttx/arch.h>
- #include <nuttx/mqueue.h>
- #include "mqueue/mqueue.h"
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxmq_wait_irq
- *
- * Description:
- * This function is called when a signal or a timeout is received by a
- * task that is waiting on a message queue -- either for a queue to
- * becoming not full (on mq_send and friends) or not empty (on mq_receive
- * and friends).
- *
- * Input Parameters:
- * wtcb - A pointer to the TCB of the task that is waiting on a message
- * queue, but has received a signal instead.
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- *
- ****************************************************************************/
- void nxmq_wait_irq(FAR struct tcb_s *wtcb, int errcode)
- {
- FAR struct mqueue_inode_s *msgq;
- irqstate_t flags;
- /* Disable interrupts. This is necessary because an interrupt handler may
- * attempt to send a message while we are doing this.
- */
- flags = enter_critical_section();
- /* It is possible that an interrupt/context switch beat us to the punch and
- * already changed the task's state. NOTE: The operations within the if
- * are safe because interrupts are always disabled with the msgwaitq,
- * nwaitnotempty, and nwaitnotfull fields are modified.
- */
- if (wtcb->task_state == TSTATE_WAIT_MQNOTEMPTY ||
- wtcb->task_state == TSTATE_WAIT_MQNOTFULL)
- {
- /* Get the message queue associated with the waiter from the TCB */
- msgq = wtcb->msgwaitq;
- DEBUGASSERT(msgq);
- wtcb->msgwaitq = NULL;
- /* Decrement the count of waiters and cancel the wait */
- if (wtcb->task_state == TSTATE_WAIT_MQNOTEMPTY)
- {
- DEBUGASSERT(msgq->nwaitnotempty > 0);
- msgq->nwaitnotempty--;
- }
- else
- {
- DEBUGASSERT(msgq->nwaitnotfull > 0);
- msgq->nwaitnotfull--;
- }
- /* Mark the errno value for the thread. */
- wtcb->pterrno = errcode;
- /* Restart the task. */
- up_unblock_task(wtcb);
- }
- /* Interrupts may now be enabled. */
- leave_critical_section(flags);
- }
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