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
PrettyDuration(uint64_t nano_duration,size_t max_fraction_digits)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
GetAppropriateTimeUnit(uint64_t nano_duration)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
GetNsToTimeUnitDivisor(TimeUnit time_unit)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
FormatDuration(uint64_t nano_duration,TimeUnit time_unit,size_t max_fraction_digits)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
GetIsoDate()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
MilliTime()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
MicroTime()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
NanoTime()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
ThreadCpuNanoTime()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
ProcessCpuNanoTime()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
NanoSleep(uint64_t ns)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
InitTimeSpec(bool absolute,int clock,int64_t ms,int32_t ns,timespec * ts)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