1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "time_utils.h" 18 19 #include <inttypes.h> 20 #include <stdio.h> 21 22 #include <limits> 23 #include <sstream> 24 25 #include "android-base/stringprintf.h" 26 27 #include "logging.h" 28 29 #if defined(__APPLE__) 30 #include <sys/time.h> 31 #endif 32 33 namespace art { 34 35 namespace { 36 37 #if !defined(__linux__) 38 int GetTimeOfDay(struct timeval* tv, struct timezone* tz) { 39 #ifdef _WIN32 40 return mingw_gettimeofday(tv, tz); 41 #else 42 return gettimeofday(tv, tz); 43 #endif 44 } 45 #endif 46 47 } // namespace 48 49 using android::base::StringPrintf; 50 51 std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits) { 52 if (nano_duration == 0) { 53 return "0"; 54 } else { 55 return FormatDuration(nano_duration, GetAppropriateTimeUnit(nano_duration), 56 max_fraction_digits); 57 } 58 } 59 60 TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration) { 61 const uint64_t one_sec = 1000 * 1000 * 1000; 62 const uint64_t one_ms = 1000 * 1000; 63 const uint64_t one_us = 1000; 64 if (nano_duration >= one_sec) { 65 return kTimeUnitSecond; 66 } else if (nano_duration >= one_ms) { 67 return kTimeUnitMillisecond; 68 } else if (nano_duration >= one_us) { 69 return kTimeUnitMicrosecond; 70 } else { 71 return kTimeUnitNanosecond; 72 } 73 } 74 75 uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit) { 76 const uint64_t one_sec = 1000 * 1000 * 1000; 77 const uint64_t one_ms = 1000 * 1000; 78 const uint64_t one_us = 1000; 79 80 switch (time_unit) { 81 case kTimeUnitSecond: 82 return one_sec; 83 case kTimeUnitMillisecond: 84 return one_ms; 85 case kTimeUnitMicrosecond: 86 return one_us; 87 case kTimeUnitNanosecond: 88 return 1; 89 } 90 return 0; 91 } 92 93 std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit, 94 size_t max_fraction_digits) { 95 const char* unit = nullptr; 96 uint64_t divisor = GetNsToTimeUnitDivisor(time_unit); 97 switch (time_unit) { 98 case kTimeUnitSecond: 99 unit = "s"; 100 break; 101 case kTimeUnitMillisecond: 102 unit = "ms"; 103 break; 104 case kTimeUnitMicrosecond: 105 unit = "us"; 106 break; 107 case kTimeUnitNanosecond: 108 unit = "ns"; 109 break; 110 } 111 const uint64_t whole_part = nano_duration / divisor; 112 uint64_t fractional_part = nano_duration % divisor; 113 if (fractional_part == 0) { 114 return StringPrintf("%" PRIu64 "%s", whole_part, unit); 115 } else { 116 static constexpr size_t kMaxDigits = 30; 117 size_t avail_digits = kMaxDigits; 118 char fraction_buffer[kMaxDigits]; 119 char* ptr = fraction_buffer; 120 uint64_t multiplier = 10; 121 // This infinite loops if fractional part is 0. 122 while (avail_digits > 1 && fractional_part * multiplier < divisor) { 123 multiplier *= 10; 124 *ptr++ = '0'; 125 avail_digits--; 126 } 127 snprintf(ptr, avail_digits, "%" PRIu64, fractional_part); 128 fraction_buffer[std::min(kMaxDigits - 1, max_fraction_digits)] = '\0'; 129 return StringPrintf("%" PRIu64 ".%s%s", whole_part, fraction_buffer, unit); 130 } 131 } 132 133 std::string GetIsoDate() { 134 time_t now = time(nullptr); 135 tm tmbuf; 136 #ifdef _WIN32 137 localtime_s(&tmbuf, &now); 138 tm* ptm = &tmbuf; 139 #else 140 tm* ptm = localtime_r(&now, &tmbuf); 141 #endif 142 return StringPrintf("%04d-%02d-%02d %02d:%02d:%02d", 143 ptm->tm_year + 1900, ptm->tm_mon+1, ptm->tm_mday, 144 ptm->tm_hour, ptm->tm_min, ptm->tm_sec); 145 } 146 147 uint64_t MilliTime() { 148 #if defined(__linux__) 149 timespec now; 150 clock_gettime(CLOCK_MONOTONIC, &now); 151 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_nsec / UINT64_C(1000000); 152 #else 153 timeval now; 154 GetTimeOfDay(&now, nullptr); 155 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_usec / UINT64_C(1000); 156 #endif 157 } 158 159 uint64_t MicroTime() { 160 #if defined(__linux__) 161 timespec now; 162 clock_gettime(CLOCK_MONOTONIC, &now); 163 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 164 #else 165 timeval now; 166 GetTimeOfDay(&now, nullptr); 167 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_usec; 168 #endif 169 } 170 171 uint64_t NanoTime() { 172 #if defined(__linux__) 173 timespec now; 174 clock_gettime(CLOCK_MONOTONIC, &now); 175 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 176 #else 177 timeval now; 178 GetTimeOfDay(&now, nullptr); 179 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_usec * UINT64_C(1000); 180 #endif 181 } 182 183 uint64_t ThreadCpuNanoTime() { 184 #if defined(__linux__) 185 timespec now; 186 clock_gettime(CLOCK_THREAD_CPUTIME_ID, &now); 187 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 188 #else 189 UNIMPLEMENTED(WARNING); 190 return -1; 191 #endif 192 } 193 194 uint64_t ProcessCpuNanoTime() { 195 #if defined(__linux__) 196 timespec now; 197 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &now); 198 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 199 #else 200 // We cannot use clock_gettime() here. Return the process wall clock time 201 // (using art::NanoTime, which relies on gettimeofday()) as approximation of 202 // the process CPU time instead. 203 // 204 // Note: clock_gettime() is available from macOS 10.12 (Darwin 16), but we try 205 // to keep things simple here. 206 return NanoTime(); 207 #endif 208 } 209 210 void NanoSleep(uint64_t ns) { 211 timespec tm; 212 tm.tv_sec = ns / MsToNs(1000); 213 tm.tv_nsec = ns - static_cast<uint64_t>(tm.tv_sec) * MsToNs(1000); 214 nanosleep(&tm, nullptr); 215 } 216 217 void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts) { 218 if (absolute) { 219 #if defined(__linux__) 220 clock_gettime(clock, ts); 221 #else 222 UNUSED(clock); 223 timeval tv; 224 GetTimeOfDay(&tv, nullptr); 225 ts->tv_sec = tv.tv_sec; 226 ts->tv_nsec = tv.tv_usec * 1000; 227 #endif 228 } else { 229 ts->tv_sec = 0; 230 ts->tv_nsec = 0; 231 } 232 233 int64_t end_sec = ts->tv_sec + ms / 1000; 234 constexpr int32_t int32_max = std::numeric_limits<int32_t>::max(); 235 if (UNLIKELY(end_sec >= int32_max)) { 236 // Either ms was intended to denote an infinite timeout, or we have a 237 // problem. The former generally uses the largest possible millisecond 238 // or nanosecond value. Log only in the latter case. 239 constexpr int64_t int64_max = std::numeric_limits<int64_t>::max(); 240 if (ms != int64_max && ms != int64_max / (1000 * 1000)) { 241 LOG(INFO) << "Note: end time exceeds INT32_MAX: " << end_sec; 242 } 243 end_sec = int32_max - 1; // Allow for increment below. 244 } 245 ts->tv_sec = end_sec; 246 ts->tv_nsec = (ts->tv_nsec + (ms % 1000) * 1000000) + ns; 247 248 // Catch rollover. 249 if (ts->tv_nsec >= 1000000000L) { 250 ts->tv_sec++; 251 ts->tv_nsec -= 1000000000L; 252 } 253 } 254 255 } // namespace art 256
