| Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Time calculation functions. |
| 3 | * |
| 4 | * Copyright 2000-2006 Willy Tarreau <w@1wt.eu> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <sys/time.h> |
| Willy Tarreau | e3ba5f0 | 2006-06-29 18:54:54 +0200 | [diff] [blame] | 14 | |
| 15 | #include <common/config.h> |
| Willy Tarreau | 2dd0d47 | 2006-06-29 17:53:05 +0200 | [diff] [blame] | 16 | #include <common/time.h> |
| Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 17 | |
| 18 | struct timeval now; /* the current date at any moment */ |
| 19 | struct timeval start_date; /* the process's start date */ |
| 20 | |
| 21 | /* |
| 22 | * adds <ms> ms to <from>, set the result to <tv> and returns a pointer <tv> |
| 23 | */ |
| 24 | struct timeval *tv_delayfrom(struct timeval *tv, struct timeval *from, int ms) |
| 25 | { |
| 26 | if (!tv || !from) |
| 27 | return NULL; |
| 28 | tv->tv_usec = from->tv_usec + (ms%1000)*1000; |
| 29 | tv->tv_sec = from->tv_sec + (ms/1000); |
| 30 | while (tv->tv_usec >= 1000000) { |
| 31 | tv->tv_usec -= 1000000; |
| 32 | tv->tv_sec++; |
| 33 | } |
| 34 | return tv; |
| 35 | } |
| 36 | |
| 37 | /* |
| 38 | * compares <tv1> and <tv2> modulo 1ms: returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2 |
| 39 | * Must not be used when either argument is eternity. Use tv_cmp2_ms() for that. |
| 40 | */ |
| 41 | int tv_cmp_ms(struct timeval *tv1, struct timeval *tv2) |
| 42 | { |
| 43 | if (tv1->tv_sec == tv2->tv_sec) { |
| 44 | if (tv2->tv_usec >= tv1->tv_usec + 1000) |
| 45 | return -1; |
| 46 | else if (tv1->tv_usec >= tv2->tv_usec + 1000) |
| 47 | return 1; |
| 48 | else |
| 49 | return 0; |
| 50 | } |
| 51 | else if ((tv2->tv_sec > tv1->tv_sec + 1) || |
| 52 | ((tv2->tv_sec == tv1->tv_sec + 1) && (tv2->tv_usec + 1000000 >= tv1->tv_usec + 1000))) |
| 53 | return -1; |
| 54 | else if ((tv1->tv_sec > tv2->tv_sec + 1) || |
| 55 | ((tv1->tv_sec == tv2->tv_sec + 1) && (tv1->tv_usec + 1000000 >= tv2->tv_usec + 1000))) |
| 56 | return 1; |
| 57 | else |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * compares <tv1> and <tv2> : returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2, |
| 63 | * considering that 0 is the eternity. |
| 64 | */ |
| 65 | int tv_cmp2(struct timeval *tv1, struct timeval *tv2) |
| 66 | { |
| 67 | if (tv_iseternity(tv1)) |
| 68 | if (tv_iseternity(tv2)) |
| 69 | return 0; /* same */ |
| 70 | else |
| 71 | return 1; /* tv1 later than tv2 */ |
| 72 | else if (tv_iseternity(tv2)) |
| 73 | return -1; /* tv2 later than tv1 */ |
| 74 | |
| 75 | if (tv1->tv_sec > tv2->tv_sec) |
| 76 | return 1; |
| 77 | else if (tv1->tv_sec < tv2->tv_sec) |
| 78 | return -1; |
| 79 | else if (tv1->tv_usec > tv2->tv_usec) |
| 80 | return 1; |
| 81 | else if (tv1->tv_usec < tv2->tv_usec) |
| 82 | return -1; |
| 83 | else |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | /* |
| 88 | * compares <tv1> and <tv2> modulo 1 ms: returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2, |
| 89 | * considering that 0 is the eternity. |
| 90 | */ |
| 91 | int tv_cmp2_ms(struct timeval *tv1, struct timeval *tv2) |
| 92 | { |
| 93 | if (tv_iseternity(tv1)) |
| 94 | if (tv_iseternity(tv2)) |
| 95 | return 0; /* same */ |
| 96 | else |
| 97 | return 1; /* tv1 later than tv2 */ |
| 98 | else if (tv_iseternity(tv2)) |
| 99 | return -1; /* tv2 later than tv1 */ |
| 100 | |
| 101 | if (tv1->tv_sec == tv2->tv_sec) { |
| 102 | if (tv1->tv_usec >= tv2->tv_usec + 1000) |
| 103 | return 1; |
| 104 | else if (tv2->tv_usec >= tv1->tv_usec + 1000) |
| 105 | return -1; |
| 106 | else |
| 107 | return 0; |
| 108 | } |
| 109 | else if ((tv1->tv_sec > tv2->tv_sec + 1) || |
| 110 | ((tv1->tv_sec == tv2->tv_sec + 1) && (tv1->tv_usec + 1000000 >= tv2->tv_usec + 1000))) |
| 111 | return 1; |
| 112 | else if ((tv2->tv_sec > tv1->tv_sec + 1) || |
| 113 | ((tv2->tv_sec == tv1->tv_sec + 1) && (tv2->tv_usec + 1000000 >= tv1->tv_usec + 1000))) |
| 114 | return -1; |
| 115 | else |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * returns the remaining time between tv1=now and event=tv2 |
| 121 | * if tv2 is passed, 0 is returned. |
| 122 | * Returns TIME_ETERNITY if tv2 is eternity. |
| 123 | */ |
| 124 | unsigned long tv_remain2(struct timeval *tv1, struct timeval *tv2) |
| 125 | { |
| 126 | unsigned long ret; |
| 127 | |
| 128 | if (tv_iseternity(tv2)) |
| 129 | return TIME_ETERNITY; |
| 130 | |
| 131 | if (tv_cmp_ms(tv1, tv2) >= 0) |
| 132 | return 0; /* event elapsed */ |
| 133 | |
| 134 | ret = (tv2->tv_sec - tv1->tv_sec) * 1000; |
| 135 | if (tv2->tv_usec > tv1->tv_usec) |
| 136 | ret += (tv2->tv_usec - tv1->tv_usec) / 1000; |
| 137 | else |
| 138 | ret -= (tv1->tv_usec - tv2->tv_usec) / 1000; |
| 139 | return (unsigned long) ret; |
| 140 | } |
| 141 | |
| 142 | |
| 143 | /* |
| 144 | * returns the absolute difference, in ms, between tv1 and tv2 |
| 145 | * Must not be used when either argument is eternity. |
| 146 | */ |
| 147 | unsigned long tv_delta(struct timeval *tv1, struct timeval *tv2) |
| 148 | { |
| 149 | int cmp; |
| 150 | unsigned long ret; |
| 151 | |
| 152 | |
| 153 | cmp = tv_cmp(tv1, tv2); |
| 154 | if (!cmp) |
| 155 | return 0; /* same dates, null diff */ |
| 156 | else if (cmp < 0) { |
| 157 | struct timeval *tmp = tv1; |
| 158 | tv1 = tv2; |
| 159 | tv2 = tmp; |
| 160 | } |
| 161 | ret = (tv1->tv_sec - tv2->tv_sec) * 1000; |
| 162 | if (tv1->tv_usec > tv2->tv_usec) |
| 163 | ret += (tv1->tv_usec - tv2->tv_usec) / 1000; |
| 164 | else |
| 165 | ret -= (tv2->tv_usec - tv1->tv_usec) / 1000; |
| 166 | return (unsigned long) ret; |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * Local variables: |
| 171 | * c-indent-level: 8 |
| 172 | * c-basic-offset: 8 |
| 173 | * End: |
| 174 | */ |