1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Get Process Times |
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5 | * @ingroup libcsupport |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2013. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | /* |
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22 | * Needed to get the prototype for this newlib helper method |
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23 | */ |
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24 | #define _COMPILING_NEWLIB |
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25 | |
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26 | #include <rtems.h> |
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27 | |
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28 | #include <sys/times.h> |
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29 | #include <sys/time.h> |
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30 | |
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31 | #include <string.h> |
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32 | #include <time.h> |
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33 | |
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34 | #include <rtems/seterr.h> |
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35 | #include <rtems/score/todimpl.h> |
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36 | #include <rtems/score/timestamp.h> |
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37 | #include <rtems/score/threadimpl.h> |
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38 | |
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39 | /** |
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40 | * POSIX 1003.1b 4.5.2 - Get Process Times |
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41 | */ |
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42 | clock_t _times( |
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43 | struct tms *ptms |
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44 | ) |
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45 | { |
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46 | rtems_interval ticks, us_per_tick; |
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47 | |
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48 | if ( !ptms ) |
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49 | rtems_set_errno_and_return_minus_one( EFAULT ); |
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50 | |
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51 | memset( ptms, 0, sizeof( *ptms ) ); |
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52 | |
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53 | /* |
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54 | * This call does not depend on TOD being initialized and can't fail. |
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55 | */ |
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56 | |
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57 | ticks = rtems_clock_get_ticks_since_boot(); |
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58 | us_per_tick = rtems_configuration_get_microseconds_per_tick(); |
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59 | |
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60 | /* |
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61 | * RTEMS technically has no notion of system versus user time |
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62 | * since there is no separation of OS from application tasks. |
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63 | * But we can at least make a distinction between the number |
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64 | * of ticks since boot and the number of ticks executed by this |
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65 | * this thread. |
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66 | */ |
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67 | { |
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68 | Timestamp_Control cpu_time_used; |
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69 | Timestamp_Control per_tick; |
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70 | uint32_t ticks_of_executing; |
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71 | uint32_t fractional_ticks; |
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72 | |
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73 | _Thread_Get_CPU_time_used( _Thread_Get_executing(), &cpu_time_used ); |
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74 | _Timestamp_Set( |
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75 | &per_tick, |
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76 | rtems_configuration_get_microseconds_per_tick() / |
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77 | TOD_MICROSECONDS_PER_SECOND, |
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78 | (rtems_configuration_get_nanoseconds_per_tick() % |
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79 | TOD_NANOSECONDS_PER_SECOND) |
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80 | ); |
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81 | _Timestamp_Divide( |
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82 | &cpu_time_used, |
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83 | &per_tick, |
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84 | &ticks_of_executing, |
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85 | &fractional_ticks |
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86 | ); |
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87 | |
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88 | ptms->tms_utime = ticks_of_executing * us_per_tick; |
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89 | } |
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90 | |
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91 | ptms->tms_stime = ticks * us_per_tick; |
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92 | |
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93 | return ticks * us_per_tick; |
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94 | } |
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95 | |
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96 | /** |
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97 | * times() system call wrapper for _times() above. |
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98 | */ |
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99 | clock_t times( |
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100 | struct tms *ptms |
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101 | ) |
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102 | { |
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103 | return _times( ptms ); |
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104 | } |
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105 | |
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106 | #if defined(RTEMS_NEWLIB) |
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107 | |
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108 | #include <reent.h> |
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109 | |
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110 | /** |
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111 | * This is the Newlib dependent reentrant version of times(). |
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112 | */ |
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113 | clock_t _times_r( |
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114 | struct _reent *ptr RTEMS_UNUSED, |
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115 | struct tms *ptms |
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116 | ) |
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117 | { |
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118 | return _times( ptms ); |
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119 | } |
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120 | #endif |
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