4.104.115
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1 | /** |
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2 | * @file score/src/timespecdividebyinteger.c |
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3 | */ |
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4 | |
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5 | /* |
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6 | * COPYRIGHT (c) 1989-2007. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.com/license/LICENSE. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #if HAVE_CONFIG_H |
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17 | #include "config.h" |
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18 | #endif |
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19 | |
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20 | #include <rtems/system.h> |
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21 | #include <sys/types.h> |
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22 | #include <rtems/score/timespec.h> |
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23 | #include <rtems/score/tod.h> |
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24 | |
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25 | void _Timespec_Divide_by_integer( |
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26 | const struct timespec *time, |
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27 | uint32_t iterations, |
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28 | struct timespec *result |
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29 | ) |
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30 | { |
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31 | uint64_t t; |
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32 | |
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33 | /* |
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34 | * For math simplicity just convert the timespec to nanoseconds |
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35 | * in a 64-bit integer. |
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36 | */ |
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37 | t = time->tv_sec; |
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38 | t *= TOD_NANOSECONDS_PER_SECOND; |
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39 | t += time->tv_nsec; |
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40 | |
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41 | /* |
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42 | * Divide to get nanoseconds per iteration |
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43 | */ |
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44 | |
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45 | t /= iterations; |
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46 | |
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47 | /* |
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48 | * Put it back in the timespec result |
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49 | */ |
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50 | |
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51 | result->tv_sec = t / TOD_NANOSECONDS_PER_SECOND; |
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52 | result->tv_nsec = t % TOD_NANOSECONDS_PER_SECOND; |
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53 | } |
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