1 | /* Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
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3 | |
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4 | The GNU C Library is free software; you can redistribute it and/or |
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5 | modify it under the terms of the GNU Lesser General Public |
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6 | License as published by the Free Software Foundation; either |
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7 | version 2.1 of the License, or (at your option) any later version. |
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8 | |
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9 | The GNU C Library is distributed in the hope that it will be useful, |
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 | Lesser General Public License for more details. |
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13 | |
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14 | You should have received a copy of the GNU Lesser General Public |
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15 | License along with the GNU C Library; if not, write to the Free |
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16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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17 | 02111-1307 USA. */ |
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18 | |
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19 | #include <errno.h> |
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20 | #include <stdint.h> |
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21 | #include <time.h> |
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22 | #include <sys/time.h> |
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23 | #include <libc-internal.h> |
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24 | #include <hp-timing.h> |
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25 | |
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26 | |
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27 | #if HP_TIMING_AVAIL |
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28 | /* Clock frequency of the processor. We make it a 64-bit variable |
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29 | because some jokers are already playing with processors with more |
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30 | than 4GHz. */ |
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31 | static hp_timing_t freq; |
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32 | |
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33 | |
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34 | /* We need the starting time for the process. */ |
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35 | extern hp_timing_t _dl_cpuclock_offset; |
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36 | |
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37 | |
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38 | /* This function is defined in the thread library. */ |
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39 | extern int __pthread_clock_gettime (hp_timing_t freq, struct timespec *tp) |
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40 | __attribute__ ((__weak__)); |
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41 | #endif |
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42 | |
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43 | |
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44 | /* Get current value of CLOCK and store it in TP. */ |
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45 | int |
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46 | clock_gettime (clockid_t clock_id, struct timespec *tp) |
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47 | { |
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48 | struct timeval tv; |
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49 | int retval = -1; |
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50 | |
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51 | switch (clock_id) |
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52 | { |
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53 | case CLOCK_REALTIME: |
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54 | retval = gettimeofday (&tv, NULL); |
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55 | if (retval == 0) |
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56 | /* Convert into `timespec'. */ |
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57 | TIMEVAL_TO_TIMESPEC (&tv, tp); |
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58 | break; |
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59 | |
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60 | #if HP_TIMING_AVAIL |
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61 | case CLOCK_PROCESS_CPUTIME_ID: |
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62 | case CLOCK_THREAD_CPUTIME_ID: |
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63 | { |
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64 | hp_timing_t tsc; |
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65 | |
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66 | if (__builtin_expect (freq == 0, 0)) |
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67 | { |
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68 | /* This can only happen if we haven't initialized the `freq' |
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69 | variable yet. Do this now. We don't have to protect this |
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70 | code against multiple execution since all of them should |
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71 | lead to the same result. */ |
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72 | freq = __get_clockfreq (); |
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73 | if (__builtin_expect (freq == 0, 0)) |
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74 | /* Something went wrong. */ |
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75 | break; |
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76 | } |
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77 | |
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78 | if (clock_id == CLOCK_THREAD_CPUTIME_ID |
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79 | && __pthread_clock_gettime != NULL) |
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80 | { |
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81 | retval = __pthread_clock_gettime (freq, tp); |
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82 | break; |
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83 | } |
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84 | |
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85 | /* Get the current counter. */ |
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86 | HP_TIMING_NOW (tsc); |
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87 | |
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88 | /* Compute the offset since the start time of the process. */ |
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89 | tsc -= _dl_cpuclock_offset; |
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90 | |
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91 | /* Compute the seconds. */ |
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92 | tp->tv_sec = tsc / freq; |
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93 | |
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94 | /* And the nanoseconds. This computation should be stable until |
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95 | we get machines with about 16GHz frequency. */ |
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96 | tp->tv_nsec = ((tsc % freq) * UINT64_C (1000000000)) / freq; |
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97 | |
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98 | retval = 0; |
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99 | } |
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100 | break; |
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101 | #endif |
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102 | |
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103 | default: |
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104 | __set_errno (EINVAL); |
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105 | break; |
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106 | } |
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107 | |
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108 | return retval; |
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109 | } |
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