88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/****************************************************************************
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* sched/semaphore/sem_timeout.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 <errno.h>
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#include <nuttx/sched.h>
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#include <nuttx/wdog.h>
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#include <nuttx/irq.h>
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#include "semaphore/semaphore.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsem_timeout
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*
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* Description:
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* This function is called if the timeout elapses before before a
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* semaphore is acquired.
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*
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* Input Parameters:
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* pid - The task ID of the task to wakeup
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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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* - Called from the context of the timer interrupt handler.
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*
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****************************************************************************/
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void nxsem_timeout(wdparm_t pid)
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{
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FAR struct tcb_s *wtcb;
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irqstate_t flags;
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/* Disable interrupts to avoid race conditions */
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flags = enter_critical_section();
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/* Get the TCB associated with this PID. It is possible that
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* task may no longer be active when this watchdog goes off.
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*/
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wtcb = nxsched_get_tcb(pid);
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/* It is also possible that an interrupt/context switch beat us to the
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* punch and already changed the task's state.
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*/
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if (wtcb && wtcb->task_state == TSTATE_WAIT_SEM)
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{
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/* Cancel the semaphore wait */
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nxsem_wait_irq(wtcb, ETIMEDOUT);
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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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