BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file BTime.h |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | * @section DESCRIPTION |
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30 | * |
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31 | * System time abstraction used by {@link BReactor}. |
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32 | */ |
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33 | |||
34 | #ifndef BADVPN_SYSTEM_BTIME_H |
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35 | #define BADVPN_SYSTEM_BTIME_H |
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36 | |||
37 | #if defined(BADVPN_USE_WINAPI) |
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38 | #include <windows.h> |
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39 | #elif defined(BADVPN_EMSCRIPTEN) |
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40 | #include <emscripten/emscripten.h> |
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41 | #else |
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42 | #include <time.h> |
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43 | #include <sys/time.h> |
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44 | #endif |
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45 | |||
46 | #include <stdint.h> |
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47 | |||
48 | #include <misc/debug.h> |
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49 | #include <misc/overflow.h> |
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50 | #include <base/BLog.h> |
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51 | |||
52 | #include <generated/blog_channel_BTime.h> |
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53 | |||
54 | typedef int64_t btime_t; |
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55 | |||
56 | #define BTIME_MIN INT64_MIN |
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57 | |||
58 | struct _BTime_global { |
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59 | #ifndef NDEBUG |
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60 | int initialized; // initialized statically |
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61 | #endif |
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62 | #if defined(BADVPN_USE_WINAPI) |
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63 | LARGE_INTEGER start_time; |
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64 | #elif defined(BADVPN_EMSCRIPTEN) |
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65 | btime_t start_time; |
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66 | #else |
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67 | btime_t start_time; |
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68 | int use_gettimeofday; |
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69 | #endif |
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70 | }; |
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71 | |||
72 | extern struct _BTime_global btime_global; |
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73 | |||
74 | static void BTime_Init (void) |
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75 | { |
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76 | ASSERT(!btime_global.initialized) |
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77 | |||
78 | #if defined(BADVPN_USE_WINAPI) |
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79 | |||
80 | ASSERT_FORCE(QueryPerformanceCounter(&btime_global.start_time)) |
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81 | |||
82 | #elif defined(BADVPN_EMSCRIPTEN) |
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83 | |||
84 | btime_global.start_time = emscripten_get_now(); |
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85 | |||
86 | #else |
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87 | |||
88 | struct timespec ts; |
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89 | if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) { |
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90 | BLog(BLOG_WARNING, "CLOCK_MONOTONIC is not available. Timers will be confused by clock changes."); |
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91 | |||
92 | struct timeval tv; |
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93 | ASSERT_FORCE(gettimeofday(&tv, NULL) == 0) |
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94 | |||
95 | btime_global.start_time = (int64_t)tv.tv_sec * 1000 + (int64_t)tv.tv_usec/1000; |
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96 | btime_global.use_gettimeofday = 1; |
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97 | } else { |
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98 | btime_global.start_time = (int64_t)ts.tv_sec * 1000 + (int64_t)ts.tv_nsec/1000000; |
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99 | btime_global.use_gettimeofday = 0; |
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100 | } |
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101 | |||
102 | #endif |
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103 | |||
104 | #ifndef NDEBUG |
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105 | btime_global.initialized = 1; |
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106 | #endif |
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107 | } |
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108 | |||
109 | static btime_t btime_gettime (void) |
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110 | { |
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111 | ASSERT(btime_global.initialized) |
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112 | |||
113 | #if defined(BADVPN_USE_WINAPI) |
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114 | |||
115 | LARGE_INTEGER count; |
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116 | LARGE_INTEGER freq; |
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117 | ASSERT_FORCE(QueryPerformanceCounter(&count)) |
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118 | ASSERT_FORCE(QueryPerformanceFrequency(&freq)) |
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119 | return (((count.QuadPart - btime_global.start_time.QuadPart) * 1000) / freq.QuadPart); |
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120 | |||
121 | #elif defined(BADVPN_EMSCRIPTEN) |
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122 | |||
123 | return (btime_t)emscripten_get_now() - btime_global.start_time; |
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124 | |||
125 | #else |
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126 | |||
127 | if (btime_global.use_gettimeofday) { |
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128 | struct timeval tv; |
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129 | ASSERT_FORCE(gettimeofday(&tv, NULL) == 0) |
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130 | return ((int64_t)tv.tv_sec * 1000 + (int64_t)tv.tv_usec/1000); |
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131 | } else { |
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132 | struct timespec ts; |
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133 | ASSERT_FORCE(clock_gettime(CLOCK_MONOTONIC, &ts) == 0) |
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134 | return (((int64_t)ts.tv_sec * 1000 + (int64_t)ts.tv_nsec/1000000) - btime_global.start_time); |
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135 | } |
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136 | |||
137 | #endif |
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138 | } |
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139 | |||
140 | static btime_t btime_add (btime_t t1, btime_t t2) |
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141 | { |
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142 | // handle overflow |
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143 | int overflows = add_int64_overflows(t1, t2); |
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144 | btime_t sum; |
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145 | if (overflows != 0) { |
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146 | if (overflows > 0) { |
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147 | sum = INT64_MAX; |
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148 | } else { |
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149 | sum = INT64_MIN; |
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150 | } |
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151 | } else { |
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152 | sum = t1 + t2; |
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153 | } |
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154 | |||
155 | return sum; |
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156 | } |
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157 | |||
158 | static btime_t btime_getpast (void) |
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159 | { |
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160 | return INT64_MIN; |
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161 | } |
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162 | |||
163 | #endif |