104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
|
/****************************************************************************
|
||
|
|
* sched/semaphore/sem_timeout.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2011, 2013-2015 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 <errno.h>
|
||
|
|
|
||
|
|
#include <nuttx/sched.h>
|
||
|
|
#include <nuttx/wdog.h>
|
||
|
|
|
||
|
|
#include <arch/irq.h>
|
||
|
|
|
||
|
|
#include "semaphore/semaphore.h"
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Public Functions
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Name: sem_timeout
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* This function is called if the timeout elapses before before a
|
||
|
|
* semaphore is acquired.
|
||
|
|
*
|
||
|
|
* Parameters:
|
||
|
|
* argc - The number of arguments (should be 1)
|
||
|
|
* pid - The task ID of the task to wakeup
|
||
|
|
*
|
||
|
|
* Return Value:
|
||
|
|
* None
|
||
|
|
*
|
||
|
|
* Assumptions:
|
||
|
|
* - Called from the context of the timer interrupt handler.
|
||
|
|
*
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
void sem_timeout(int argc, wdparm_t pid)
|
||
|
|
{
|
||
|
|
FAR struct tcb_s *wtcb;
|
||
|
|
irqstate_t flags;
|
||
|
|
|
||
|
|
/* Disable interrupts to avoid race conditions */
|
||
|
|
|
||
|
|
flags = irqsave();
|
||
|
|
|
||
|
|
/* Get the TCB associated with this PID. It is possible that
|
||
|
|
* task may no longer be active when this watchdog goes off.
|
||
|
|
*/
|
||
|
|
|
||
|
|
wtcb = sched_gettcb((pid_t)pid);
|
||
|
|
|
||
|
|
/* It is also possible that an interrupt/context switch beat us to the
|
||
|
|
* punch and already changed the task's state.
|
||
|
|
*/
|
||
|
|
|
||
|
|
if (wtcb && wtcb->task_state == TSTATE_WAIT_SEM)
|
||
|
|
{
|
||
|
|
/* Cancel the semaphore wait */
|
||
|
|
|
||
|
|
sem_waitirq(wtcb, ETIMEDOUT);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Interrupts may now be enabled. */
|
||
|
|
|
||
|
|
irqrestore(flags);
|
||
|
|
}
|