6a3c2aded6
* Simplify EINTR/ECANCEL error handling 1. Add semaphore uninterruptible wait function 2 .Replace semaphore wait loop with a single uninterruptible wait 3. Replace all sem_xxx to nxsem_xxx * Unify the void cast usage 1. Remove void cast for function because many place ignore the returned value witout cast 2. Replace void cast for variable with UNUSED macro
109 lines
4.3 KiB
C
109 lines
4.3 KiB
C
/****************************************************************************
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* sched/timer/timer_gettime.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <time.h>
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#include <errno.h>
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#include "clock/clock.h"
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#include "timer/timer.h"
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#ifndef CONFIG_DISABLE_POSIX_TIMERS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: timer_gettime
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*
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* Description:
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* The timer_gettime() function will store the amount of time until the
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* specified timer, timerid, expires and the reload value of the timer
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* into the space pointed to by the value argument. The it_value member
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* of this structure will contain the amount of time before the timer
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* expires, or zero if the timer is disarmed. This value is returned as
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* the interval until timer expiration, even if the timer was armed with
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* absolute time. The it_interval member of value will contain the reload
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* value last set by timer_settime().
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*
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* Input Parameters:
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* timerid - The pre-thread timer, previously created by the call to
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* timer_create(), whose remaining time count will be returned..
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*
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* Returned Value:
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* If the timer_gettime() succeeds, a value of 0 (OK) will be returned.
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* If an error occurs, the value -1 (ERROR) will be returned, and errno
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* set to indicate the error.
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*
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* EINVAL - The timerid argument does not correspond to an ID returned by
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* timer_create() but not yet deleted by timer_delete().
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*
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* Assumptions/Limitations:
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* Due to the asynchronous operation of this function, the time reported
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* by this function could be significantly more than that actual time
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* remaining on the timer at any time.
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*
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****************************************************************************/
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int timer_gettime(timer_t timerid, FAR struct itimerspec *value)
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{
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FAR struct posix_timer_s *timer = (FAR struct posix_timer_s *)timerid;
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sclock_t ticks;
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if (!timer || !value)
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{
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set_errno(EINVAL);
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return ERROR;
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}
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/* Get the number of ticks before the underlying watchdog expires */
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ticks = wd_gettime(timer->pt_wdog);
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/* Convert that to a struct timespec and return it */
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clock_ticks2time(ticks, &value->it_value);
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clock_ticks2time(timer->pt_last, &value->it_interval);
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return OK;
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}
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#endif /* CONFIG_DISABLE_POSIX_TIMERS */
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