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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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76 // Seed the random number generator. | 76 // Seed the random number generator. |
77 // Convert the current time to a 64-bit integer first, before converting it | 77 // Convert the current time to a 64-bit integer first, before converting it |
78 // to an unsigned. Going directly can cause an overflow and the seed to be | 78 // to an unsigned. Going directly can cause an overflow and the seed to be |
79 // set to all ones. The seed will be identical for different instances that | 79 // set to all ones. The seed will be identical for different instances that |
80 // call this setup code within the same millisecond. | 80 // call this setup code within the same millisecond. |
81 uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); | 81 uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); |
82 srandom(static_cast<unsigned int>(seed)); | 82 srandom(static_cast<unsigned int>(seed)); |
83 } | 83 } |
84 | 84 |
85 | 85 |
86 int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) { | |
87 struct rusage usage; | |
88 | |
89 if (getrusage(RUSAGE_SELF, &usage) < 0) return -1; | |
90 *secs = usage.ru_utime.tv_sec; | |
91 *usecs = usage.ru_utime.tv_usec; | |
92 return 0; | |
93 } | |
94 | |
95 | |
96 double OS::TimeCurrentMillis() { | |
97 struct timeval tv; | |
98 if (gettimeofday(&tv, NULL) < 0) return 0.0; | |
99 return (static_cast<double>(tv.tv_sec) * 1000) + | |
100 (static_cast<double>(tv.tv_usec) / 1000); | |
101 } | |
102 | |
103 | |
104 int64_t OS::Ticks() { | |
105 // FreeBSD's gettimeofday has microsecond resolution. | |
106 struct timeval tv; | |
107 if (gettimeofday(&tv, NULL) < 0) | |
108 return 0; | |
109 return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec; | |
110 } | |
111 | |
112 | |
113 char* OS::LocalTimezone(double time) { | |
114 time_t tv = static_cast<time_t>(floor(time/msPerSecond)); | |
115 struct tm* t = localtime(&tv); | |
116 return const_cast<char*>(t->tm_zone); | |
117 } | |
118 | |
119 | |
120 double OS::DaylightSavingsOffset(double time) { | |
121 time_t tv = static_cast<time_t>(floor(time/msPerSecond)); | |
122 struct tm* t = localtime(&tv); | |
123 return t->tm_isdst > 0 ? 3600 * msPerSecond : 0; | |
124 } | |
125 | |
126 | |
127 double OS::LocalTimeOffset() { | |
128 time_t tv = time(NULL); | |
129 struct tm* t = localtime(&tv); | |
130 // tm_gmtoff includes any daylight savings offset, so subtract it. | |
131 return static_cast<double>(t->tm_gmtoff * msPerSecond - | |
132 (t->tm_isdst > 0 ? 3600 * msPerSecond : 0)); | |
133 } | |
134 | |
135 | |
136 FILE* OS::FOpen(const char* path, const char* mode) { | 86 FILE* OS::FOpen(const char* path, const char* mode) { |
137 return fopen(path, mode); | 87 return fopen(path, mode); |
138 } | 88 } |
139 | 89 |
140 | 90 |
141 void OS::Print(const char* format, ...) { | 91 void OS::Print(const char* format, ...) { |
142 va_list args; | 92 va_list args; |
143 va_start(args, format); | 93 va_start(args, format); |
144 VPrint(format, args); | 94 VPrint(format, args); |
145 va_end(args); | 95 va_end(args); |
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729 } | 679 } |
730 | 680 |
731 // This sampler is no longer the active sampler. | 681 // This sampler is no longer the active sampler. |
732 active_sampler_ = NULL; | 682 active_sampler_ = NULL; |
733 active_ = false; | 683 active_ = false; |
734 } | 684 } |
735 | 685 |
736 #endif // ENABLE_LOGGING_AND_PROFILING | 686 #endif // ENABLE_LOGGING_AND_PROFILING |
737 | 687 |
738 } } // namespace v8::internal | 688 } } // namespace v8::internal |
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