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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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79 // Seed the random number generator. | 79 // Seed the random number generator. |
80 // Convert the current time to a 64-bit integer first, before converting it | 80 // Convert the current time to a 64-bit integer first, before converting it |
81 // to an unsigned. Going directly will cause an overflow and the seed to be | 81 // to an unsigned. Going directly will cause an overflow and the seed to be |
82 // set to all ones. The seed will be identical for different instances that | 82 // set to all ones. The seed will be identical for different instances that |
83 // call this setup code within the same millisecond. | 83 // call this setup code within the same millisecond. |
84 uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); | 84 uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); |
85 srandom(static_cast<unsigned int>(seed)); | 85 srandom(static_cast<unsigned int>(seed)); |
86 } | 86 } |
87 | 87 |
88 | 88 |
89 int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) { | |
90 struct rusage usage; | |
91 | |
92 if (getrusage(RUSAGE_SELF, &usage) < 0) return -1; | |
93 *secs = usage.ru_utime.tv_sec; | |
94 *usecs = usage.ru_utime.tv_usec; | |
95 return 0; | |
96 } | |
97 | |
98 | |
99 double OS::TimeCurrentMillis() { | |
100 struct timeval tv; | |
101 if (gettimeofday(&tv, NULL) < 0) return 0.0; | |
102 return (static_cast<double>(tv.tv_sec) * 1000) + | |
103 (static_cast<double>(tv.tv_usec) / 1000); | |
104 } | |
105 | |
106 | |
107 int64_t OS::Ticks() { | |
108 // Mac OS's gettimeofday has microsecond resolution. | |
109 struct timeval tv; | |
110 if (gettimeofday(&tv, NULL) < 0) | |
111 return 0; | |
112 return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec; | |
113 } | |
114 | |
115 | |
116 char* OS::LocalTimezone(double time) { | |
117 time_t tv = static_cast<time_t>(floor(time/msPerSecond)); | |
118 struct tm* t = localtime(&tv); | |
119 return const_cast<char*>(t->tm_zone); | |
120 } | |
121 | |
122 | |
123 double OS::DaylightSavingsOffset(double time) { | |
124 time_t tv = static_cast<time_t>(floor(time/msPerSecond)); | |
125 struct tm* t = localtime(&tv); | |
126 return t->tm_isdst > 0 ? 3600 * msPerSecond : 0; | |
127 } | |
128 | |
129 | |
130 double OS::LocalTimeOffset() { | |
131 time_t tv = time(NULL); | |
132 struct tm* t = localtime(&tv); | |
133 // tm_gmtoff includes any daylight savings offset, so subtract it. | |
134 return static_cast<double>(t->tm_gmtoff * msPerSecond - | |
135 (t->tm_isdst > 0 ? 3600 * msPerSecond : 0)); | |
136 } | |
137 | |
138 | |
139 FILE* OS::FOpen(const char* path, const char* mode) { | 89 FILE* OS::FOpen(const char* path, const char* mode) { |
140 return fopen(path, mode); | 90 return fopen(path, mode); |
141 } | 91 } |
142 | 92 |
143 | 93 |
144 void OS::Print(const char* format, ...) { | 94 void OS::Print(const char* format, ...) { |
145 va_list args; | 95 va_list args; |
146 va_start(args, format); | 96 va_start(args, format); |
147 VPrint(format, args); | 97 VPrint(format, args); |
148 va_end(args); | 98 va_end(args); |
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655 } | 605 } |
656 | 606 |
657 // This sampler is no longer the active sampler. | 607 // This sampler is no longer the active sampler. |
658 active_sampler_ = NULL; | 608 active_sampler_ = NULL; |
659 active_ = false; | 609 active_ = false; |
660 } | 610 } |
661 | 611 |
662 #endif // ENABLE_LOGGING_AND_PROFILING | 612 #endif // ENABLE_LOGGING_AND_PROFILING |
663 | 613 |
664 } } // namespace v8::internal | 614 } } // namespace v8::internal |
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