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 <inttypes.h> 18 #include <limits> 19 #include <sstream> 20 21 #include "time_utils.h" 22 23 #include "android-base/stringprintf.h" 24 25 #include "base/logging.h" 26 27 #if defined(__APPLE__) 28 #include <sys/time.h> 29 #endif 30 31 namespace art { 32 33 using android::base::StringPrintf; 34 35 std::string PrettyDuration(uint64_t nano_duration, size_t max_fraction_digits) { 36 if (nano_duration == 0) { 37 return "0"; 38 } else { 39 return FormatDuration(nano_duration, GetAppropriateTimeUnit(nano_duration), 40 max_fraction_digits); 41 } 42 } 43 44 TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration) { 45 const uint64_t one_sec = 1000 * 1000 * 1000; 46 const uint64_t one_ms = 1000 * 1000; 47 const uint64_t one_us = 1000; 48 if (nano_duration >= one_sec) { 49 return kTimeUnitSecond; 50 } else if (nano_duration >= one_ms) { 51 return kTimeUnitMillisecond; 52 } else if (nano_duration >= one_us) { 53 return kTimeUnitMicrosecond; 54 } else { 55 return kTimeUnitNanosecond; 56 } 57 } 58 59 uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit) { 60 const uint64_t one_sec = 1000 * 1000 * 1000; 61 const uint64_t one_ms = 1000 * 1000; 62 const uint64_t one_us = 1000; 63 64 switch (time_unit) { 65 case kTimeUnitSecond: 66 return one_sec; 67 case kTimeUnitMillisecond: 68 return one_ms; 69 case kTimeUnitMicrosecond: 70 return one_us; 71 case kTimeUnitNanosecond: 72 return 1; 73 } 74 return 0; 75 } 76 77 std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit, 78 size_t max_fraction_digits) { 79 const char* unit = nullptr; 80 uint64_t divisor = GetNsToTimeUnitDivisor(time_unit); 81 switch (time_unit) { 82 case kTimeUnitSecond: 83 unit = "s"; 84 break; 85 case kTimeUnitMillisecond: 86 unit = "ms"; 87 break; 88 case kTimeUnitMicrosecond: 89 unit = "us"; 90 break; 91 case kTimeUnitNanosecond: 92 unit = "ns"; 93 break; 94 } 95 const uint64_t whole_part = nano_duration / divisor; 96 uint64_t fractional_part = nano_duration % divisor; 97 if (fractional_part == 0) { 98 return StringPrintf("%" PRIu64 "%s", whole_part, unit); 99 } else { 100 static constexpr size_t kMaxDigits = 30; 101 size_t avail_digits = kMaxDigits; 102 char fraction_buffer[kMaxDigits]; 103 char* ptr = fraction_buffer; 104 uint64_t multiplier = 10; 105 // This infinite loops if fractional part is 0. 106 while (avail_digits > 1 && fractional_part * multiplier < divisor) { 107 multiplier *= 10; 108 *ptr++ = '0'; 109 avail_digits--; 110 } 111 snprintf(ptr, avail_digits, "%" PRIu64, fractional_part); 112 fraction_buffer[std::min(kMaxDigits - 1, max_fraction_digits)] = '\0'; 113 return StringPrintf("%" PRIu64 ".%s%s", whole_part, fraction_buffer, unit); 114 } 115 } 116 117 std::string GetIsoDate() { 118 time_t now = time(nullptr); 119 tm tmbuf; 120 tm* ptm = localtime_r(&now, &tmbuf); 121 return StringPrintf("%04d-%02d-%02d %02d:%02d:%02d", 122 ptm->tm_year + 1900, ptm->tm_mon+1, ptm->tm_mday, 123 ptm->tm_hour, ptm->tm_min, ptm->tm_sec); 124 } 125 126 uint64_t MilliTime() { 127 #if defined(__linux__) 128 timespec now; 129 clock_gettime(CLOCK_MONOTONIC, &now); 130 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_nsec / UINT64_C(1000000); 131 #else // __APPLE__ 132 timeval now; 133 gettimeofday(&now, nullptr); 134 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000) + now.tv_usec / UINT64_C(1000); 135 #endif 136 } 137 138 uint64_t MicroTime() { 139 #if defined(__linux__) 140 timespec now; 141 clock_gettime(CLOCK_MONOTONIC, &now); 142 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 143 #else // __APPLE__ 144 timeval now; 145 gettimeofday(&now, nullptr); 146 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_usec; 147 #endif 148 } 149 150 uint64_t NanoTime() { 151 #if defined(__linux__) 152 timespec now; 153 clock_gettime(CLOCK_MONOTONIC, &now); 154 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 155 #else // __APPLE__ 156 timeval now; 157 gettimeofday(&now, nullptr); 158 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_usec * UINT64_C(1000); 159 #endif 160 } 161 162 uint64_t ThreadCpuNanoTime() { 163 #if defined(__linux__) 164 timespec now; 165 clock_gettime(CLOCK_THREAD_CPUTIME_ID, &now); 166 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 167 #else // __APPLE__ 168 UNIMPLEMENTED(WARNING); 169 return -1; 170 #endif 171 } 172 173 uint64_t ProcessCpuNanoTime() { 174 #if defined(__linux__) 175 timespec now; 176 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &now); 177 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; 178 #else 179 UNIMPLEMENTED(WARNING); 180 return -1; 181 #endif 182 } 183 184 void NanoSleep(uint64_t ns) { 185 timespec tm; 186 tm.tv_sec = ns / MsToNs(1000); 187 tm.tv_nsec = ns - static_cast<uint64_t>(tm.tv_sec) * MsToNs(1000); 188 nanosleep(&tm, nullptr); 189 } 190 191 void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts) { 192 if (absolute) { 193 #if !defined(__APPLE__) 194 clock_gettime(clock, ts); 195 #else 196 UNUSED(clock); 197 timeval tv; 198 gettimeofday(&tv, nullptr); 199 ts->tv_sec = tv.tv_sec; 200 ts->tv_nsec = tv.tv_usec * 1000; 201 #endif 202 } else { 203 ts->tv_sec = 0; 204 ts->tv_nsec = 0; 205 } 206 207 int64_t end_sec = ts->tv_sec + ms / 1000; 208 constexpr int32_t int32_max = std::numeric_limits<int32_t>::max(); 209 if (UNLIKELY(end_sec >= int32_max)) { 210 // Either ms was intended to denote an infinite timeout, or we have a 211 // problem. The former generally uses the largest possible millisecond 212 // or nanosecond value. Log only in the latter case. 213 constexpr int64_t int64_max = std::numeric_limits<int64_t>::max(); 214 if (ms != int64_max && ms != int64_max / (1000 * 1000)) { 215 LOG(INFO) << "Note: end time exceeds INT32_MAX: " << end_sec; 216 } 217 end_sec = int32_max - 1; // Allow for increment below. 218 } 219 ts->tv_sec = end_sec; 220 ts->tv_nsec = (ts->tv_nsec + (ms % 1000) * 1000000) + ns; 221 222 // Catch rollover. 223 if (ts->tv_nsec >= 1000000000L) { 224 ts->tv_sec++; 225 ts->tv_nsec -= 1000000000L; 226 } 227 } 228 229 } // namespace art 230