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/********************************************************************************
* sched/timer/timer_getoverrun.c
*
* Copyright (C) 2007, 2008, 2011 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 <time.h>
#include <errno.h>
#include "timer/timer.h"
#ifndef CONFIG_DISABLE_POSIX_TIMERS
/********************************************************************************
* Definitions
********************************************************************************/
/********************************************************************************
* Private Data
********************************************************************************/
/********************************************************************************
* Public Data
********************************************************************************/
/********************************************************************************
* Private Functions
********************************************************************************/
/********************************************************************************
* Public Functions
********************************************************************************/
/********************************************************************************
* Name: timer_getoverrun
*
* Description:
* Only a single signal will be queued to the process for a given timer at any
* point in time. When a timer for which a signal is still pending expires, no
* signal will be queued, and a timer overrun will occur. When a timer
* expiration signal is delivered to or accepted by a process, if the
* implementation supports the Realtime Signals Extension, the
* timer_getoverrun() function will return the timer expiration overrun count for
* the specified timer. The overrun count returned contains the number of extra
* timer expirations that occurred between the time the signal was generated
* (queued) and when it was delivered or accepted, up to but not including an
* implementation-defined maximum of DELAYTIMER_MAX. If the number of such
* extra expirations is greater than or equal to DELAYTIMER_MAX, then the
* overrun count will be set to DELAYTIMER_MAX. The value returned by
* timer_getoverrun() will apply to the most recent expiration signal delivery
* or acceptance for the timer. If no expiration signal has been delivered
* for the timer, or if the Realtime Signals Extension is not supported, the
* return value of timer_getoverrun() is unspecified.
*
* Parameters:
* timerid - The pre-thread timer, previously created by the call to
* timer_create(), whose overrun count will be returned..
*
* Return Value:
* If the timer_getoverrun() function succeeds, it will return the timer
* expiration overrun count as explained above. timer_getoverrun() will fail if:
*
* EINVAL - The timerid argument does not correspond to an ID returned by
* timer_create() but not yet deleted by timer_delete().
*
* Assumptions:
*
********************************************************************************/
int timer_getoverrun(timer_t timerid)
{
set_errno(ENOSYS);
return ERROR;
}
#endif /* CONFIG_DISABLE_POSIX_TIMERS */
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