1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup RTEMSScoreTimespec |
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7 | * |
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8 | * @brief This source file contains the implementation of |
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9 | * _Timespec_To_ticks(). |
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10 | */ |
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11 | |
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12 | /* |
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13 | * COPYRIGHT (c) 1989-2007. |
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14 | * On-Line Applications Research Corporation (OAR). |
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15 | * |
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16 | * Redistribution and use in source and binary forms, with or without |
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17 | * modification, are permitted provided that the following conditions |
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18 | * are met: |
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19 | * 1. Redistributions of source code must retain the above copyright |
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20 | * notice, this list of conditions and the following disclaimer. |
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21 | * 2. Redistributions in binary form must reproduce the above copyright |
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22 | * notice, this list of conditions and the following disclaimer in the |
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23 | * documentation and/or other materials provided with the distribution. |
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24 | * |
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25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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26 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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29 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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35 | * POSSIBILITY OF SUCH DAMAGE. |
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36 | */ |
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37 | |
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38 | #ifdef HAVE_CONFIG_H |
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39 | #include "config.h" |
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40 | #endif |
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41 | |
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42 | #include <rtems/score/timespec.h> |
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43 | #include <rtems/score/todimpl.h> |
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44 | #include <rtems/config.h> |
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45 | |
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46 | /** |
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47 | * |
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48 | * This routines converts a timespec to the corresponding number of ticks. |
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49 | */ |
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50 | |
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51 | uint32_t _Timespec_To_ticks( |
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52 | const struct timespec *time |
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53 | ) |
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54 | { |
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55 | uint32_t ticks; |
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56 | uint32_t nanoseconds_per_tick; |
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57 | |
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58 | if ( (time->tv_sec == 0) && (time->tv_nsec == 0) ) |
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59 | return 0; |
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60 | |
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61 | /** |
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62 | * We should ensure the ticks not be truncated by integer division. We |
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63 | * need to have it be greater than or equal to the requested time. It |
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64 | * should not be shorter. |
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65 | */ |
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66 | ticks = time->tv_sec * TOD_TICKS_PER_SECOND; |
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67 | nanoseconds_per_tick = rtems_configuration_get_nanoseconds_per_tick(); |
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68 | ticks += time->tv_nsec / nanoseconds_per_tick; |
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69 | |
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70 | if ( (time->tv_nsec % nanoseconds_per_tick) != 0 ) |
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71 | ticks += 1; |
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72 | |
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73 | return ticks; |
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74 | } |
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