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 #define _POSIX_THREAD_SAFE_FUNCTIONS // For mingw localtime_r(). 18 19 #include "time_utils.h" 20 21 #include <inttypes.h> 22 #include <stdio.h> 23 24 #include <limits> 25 #include <sstream> 26 27 #include "android-base/stringprintf.h" 28 29 #include "logging.h" 30 31 #if defined(__APPLE__) 32 #include <sys/time.h> 33 #endif 34 35 namespace art { 36 37 namespace { 38 39 #if !defined(__linux__) GetTimeOfDay(struct timeval * tv,struct timezone * tz)40 int GetTimeOfDay(struct timeval* tv, struct timezone* tz) { 41 #ifdef _WIN32 42 return mingw_gettimeofday(tv, tz); 43 #else 44 return gettimeofday(tv, tz); 45 #endif 46 } 47 #endif 48 49 } // namespace 50 51 using android::base::StringPrintf; 52 PrettyDuration(uint64_t nano_duration,size_t max_fraction_digits)53 std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits) { 54 if (nano_duration == 0) { 55 return "0"; 56 } else { 57 return FormatDuration(nano_duration, GetAppropriateTimeUnit(nano_duration), 58 max_fraction_digits); 59 } 60 } 61 GetAppropriateTimeUnit(uint64_t nano_duration)62 TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration) { 63 const uint64_t one_sec = 1000 * 1000 * 1000; 64 const uint64_t one_ms = 1000 * 1000; 65 const uint64_t one_us = 1000; 66 if (nano_duration >= one_sec) { 67 return kTimeUnitSecond; 68 } else if (nano_duration >= one_ms) { 69 return kTimeUnitMillisecond; 70 } else if (nano_duration >= one_us) { 71 return kTimeUnitMicrosecond; 72 } else { 73 return kTimeUnitNanosecond; 74 } 75 } 76 GetNsToTimeUnitDivisor(TimeUnit time_unit)77 uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit) { 78 const uint64_t one_sec = 1000 * 1000 * 1000; 79 const uint64_t one_ms = 1000 * 1000; 80 const uint64_t one_us = 1000; 81 82 switch (time_unit) { 83 case kTimeUnitSecond: 84 return one_sec; 85 case kTimeUnitMillisecond: 86 return one_ms; 87 case kTimeUnitMicrosecond: 88 return one_us; 89 case kTimeUnitNanosecond: 90 return 1; 91 } 92 return 0; 93 } 94 FormatDuration(uint64_t nano_duration,TimeUnit time_unit,size_t max_fraction_digits)95 std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit, 96 size_t max_fraction_digits) { 97 const char* unit = nullptr; 98 uint64_t divisor = GetNsToTimeUnitDivisor(time_unit); 99 switch (time_unit) { 100 case kTimeUnitSecond: 101 unit = "s"; 102 break; 103 case kTimeUnitMillisecond: 104 unit = "ms"; 105 break; 106 case kTimeUnitMicrosecond: 107 unit = "us"; 108 break; 109 case kTimeUnitNanosecond: 110 unit = "ns"; 111 break; 112 } 113 const uint64_t whole_part = nano_duration / divisor; 114 uint64_t fractional_part = nano_duration % divisor; 115 if (fractional_part == 0) { 116 return StringPrintf("%" PRIu64 "%s", whole_part, unit); 117 } else { 118 static constexpr size_t kMaxDigits = 30; 119 size_t avail_digits = kMaxDigits; 120 char fraction_buffer[kMaxDigits]; 121 char* ptr = fraction_buffer; 122 uint64_t multiplier = 10; 123 // This infinite loops if fractional part is 0. 124 while (avail_digits > 1 && fractional_part * multiplier < divisor) { 125 multiplier *= 10; 126 *ptr++ = '0'; 127 avail_digits--; 128 } 129 snprintf(ptr, avail_digits, "%" PRIu64, fractional_part); 130 fraction_buffer[std::min(kMaxDigits - 1, max_fraction_digits)] = '\0'; 131 return StringPrintf("%" PRIu64 ".%s%s", whole_part, fraction_buffer, unit); 132 } 133 } 134 GetIsoDate()135 std::string GetIsoDate() { 136 tm tmbuf; 137 int ns; 138 if (__builtin_available(macOS 10.12, *)) { 139 timespec now; 140 clock_gettime(CLOCK_REALTIME, &now); 141 localtime_r(&now.tv_sec, &tmbuf); 142 ns = now.tv_nsec; 143 } else { 144 time_t now = time(nullptr); 145 localtime_r(&now, &tmbuf); 146 ns = 0; 147 } 148 char zone[16] = {}; 149 strftime(zone, sizeof(zone), "%z", &tmbuf); 150 return StringPrintf("%04d-%02d-%02d %02d:%02d:%02d.%09d%s", 151 tmbuf.tm_year + 1900, tmbuf.tm_mon+1, tmbuf.tm_mday, 152 tmbuf.tm_hour, tmbuf.tm_min, tmbuf.tm_sec, ns, zone); 153 } 154 MilliTime()155 uint64_t MilliTime() { 156 #if defined(__linux__) 157 timespec now; 158 clock_gettime(CLOCK_MONOTONIC, &now); 159 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_nsec / UINT64_C(1000000); 160 #else 161 timeval now; 162 GetTimeOfDay(&now, nullptr); 163 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_usec / UINT64_C(1000); 164 #endif 165 } 166 MicroTime()167 uint64_t MicroTime() { 168 #if defined(__linux__) 169 timespec now; 170 clock_gettime(CLOCK_MONOTONIC, &now); 171 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 172 #else 173 timeval now; 174 GetTimeOfDay(&now, nullptr); 175 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_usec; 176 #endif 177 } 178 NanoTime()179 uint64_t NanoTime() { 180 #if defined(__linux__) 181 timespec now; 182 clock_gettime(CLOCK_MONOTONIC, &now); 183 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 184 #else 185 timeval now; 186 GetTimeOfDay(&now, nullptr); 187 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_usec * UINT64_C(1000); 188 #endif 189 } 190 ThreadCpuNanoTime()191 uint64_t ThreadCpuNanoTime() { 192 #if defined(__linux__) 193 timespec now; 194 clock_gettime(CLOCK_THREAD_CPUTIME_ID, &now); 195 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 196 #else 197 UNIMPLEMENTED(WARNING); 198 return -1; 199 #endif 200 } 201 ProcessCpuNanoTime()202 uint64_t ProcessCpuNanoTime() { 203 #if defined(__linux__) 204 timespec now; 205 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &now); 206 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 207 #else 208 // We cannot use clock_gettime() here. Return the process wall clock time 209 // (using art::NanoTime, which relies on gettimeofday()) as approximation of 210 // the process CPU time instead. 211 // 212 // Note: clock_gettime() is available from macOS 10.12 (Darwin 16), but we try 213 // to keep things simple here. 214 return NanoTime(); 215 #endif 216 } 217 NanoSleep(uint64_t ns)218 void NanoSleep(uint64_t ns) { 219 timespec tm; 220 tm.tv_sec = SaturatedTimeT(ns / MsToNs(1000)); 221 tm.tv_nsec = ns - static_cast<uint64_t>(tm.tv_sec) * MsToNs(1000); 222 nanosleep(&tm, nullptr); 223 } 224 InitTimeSpec(bool absolute,int clock,int64_t ms,int32_t ns,timespec * ts)225 void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts) { 226 if (absolute) { 227 #if defined(__linux__) 228 clock_gettime(clock, ts); 229 #else 230 UNUSED(clock); 231 timeval tv; 232 GetTimeOfDay(&tv, nullptr); 233 ts->tv_sec = tv.tv_sec; 234 ts->tv_nsec = tv.tv_usec * 1000; 235 #endif 236 } else { 237 ts->tv_sec = 0; 238 ts->tv_nsec = 0; 239 } 240 241 int64_t end_sec = ts->tv_sec + ms / 1000; 242 constexpr int32_t int32_max = std::numeric_limits<int32_t>::max(); 243 if (UNLIKELY(end_sec >= int32_max)) { 244 // Either ms was intended to denote an infinite timeout, or we have a 245 // problem. The former generally uses the largest possible millisecond 246 // or nanosecond value. Log only in the latter case. 247 constexpr int64_t int64_max = std::numeric_limits<int64_t>::max(); 248 if (ms != int64_max && ms != int64_max / (1000 * 1000)) { 249 LOG(INFO) << "Note: end time exceeds INT32_MAX: " << end_sec; 250 } 251 end_sec = int32_max - 1; // Allow for increment below. 252 } 253 ts->tv_sec = end_sec; 254 ts->tv_nsec = (ts->tv_nsec + (ms % 1000) * 1000000) + ns; 255 256 // Catch rollover. 257 if (ts->tv_nsec >= 1000000000L) { 258 ts->tv_sec++; 259 ts->tv_nsec -= 1000000000L; 260 } 261 } 262 263 } // namespace art 264