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126 lines
4.7 KiB
126 lines
4.7 KiB
/******************************************************************************** |
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* clock_abstime2ticks.c |
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* |
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* Copyright (C) 2007, 2008 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 <debug.h> |
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#include "clock_internal.h" |
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/******************************************************************************** |
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* Definitions |
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********************************************************************************/ |
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/******************************************************************************** |
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* Private Type Declarations |
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********************************************************************************/ |
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/******************************************************************************** |
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* Global Variables |
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********************************************************************************/ |
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/******************************************************************************** |
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* Private Variables |
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********************************************************************************/ |
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/******************************************************************************** |
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* Private Functions |
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********************************************************************************/ |
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/******************************************************************************** |
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* Public Functions |
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********************************************************************************/ |
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/******************************************************************************** |
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* Name: clock_abstime2ticks |
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* |
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* Description: |
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* Convert an absolute timespec delay to system timer ticks. |
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* |
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* Parameters: |
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* clockid - The timing source to use in the conversion |
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* reltime - Convert this absolue time to system clock ticks. |
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* ticks - Return the converted number of ticks here. |
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* |
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* Return Value: |
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* OK on success; A non-zero error number on failure; |
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* |
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* Assumptions: |
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* Interrupts should be disabled so that the time is not changing during the |
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* calculation |
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* |
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********************************************************************************/ |
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int clock_abstime2ticks(clockid_t clockid, FAR const struct timespec *abstime, |
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FAR int *ticks) |
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{ |
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struct timespec currtime; |
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struct timespec reltime; |
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int ret; |
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/* Convert the timespec to clock ticks. NOTE: Here we use internal knowledge |
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* that CLOCK_REALTIME is defined to be zero! |
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*/ |
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ret = clock_gettime(clockid, &currtime); |
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if (ret) |
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{ |
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return EINVAL; |
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} |
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/* The relative time to wait is the absolute time minus the current time. */ |
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reltime.tv_nsec = (abstime->tv_nsec - currtime.tv_nsec); |
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reltime.tv_sec = (abstime->tv_sec - currtime.tv_sec); |
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/* Check if we were supposed to borrow from the seconds to borrow from the |
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* seconds |
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*/ |
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if (reltime.tv_nsec < 0) |
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{ |
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reltime.tv_nsec += NSEC_PER_SEC; |
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reltime.tv_sec -= 1; |
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} |
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/* Convert this relative time into microseconds.*/ |
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return clock_time2ticks(&reltime, ticks); |
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}
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