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Issue 1519563003: Use a monotonic clock in the implementation of Timer. (Closed) Base URL: git@github.com:dart-lang/sdk.git@master
Patch Set: Created 5 years ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 #include "platform/globals.h" 5 #include "platform/globals.h"
6 #if defined(TARGET_OS_WINDOWS) 6 #if defined(TARGET_OS_WINDOWS)
7 7
8 #include <errno.h> // NOLINT 8 #include <errno.h> // NOLINT
9 #include <time.h> // NOLINT 9 #include <time.h> // NOLINT
10 10
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161 unicode_argc = argc; 161 unicode_argc = argc;
162 } 162 }
163 for (int i = 0; i < unicode_argc; i++) { 163 for (int i = 0; i < unicode_argc; i++) {
164 wchar_t* arg = unicode_argv[i]; 164 wchar_t* arg = unicode_argv[i];
165 argv[i] = StringUtilsWin::WideToUtf8(arg); 165 argv[i] = StringUtilsWin::WideToUtf8(arg);
166 } 166 }
167 LocalFree(unicode_argv); 167 LocalFree(unicode_argv);
168 return true; 168 return true;
169 } 169 }
170 170
171 int64_t TimerUtils::GetCurrentTimeMilliseconds() { 171 int64_t TimerUtils::GetCurrentMonotonicMillis() {
172 return GetCurrentTimeMicros() / 1000; 172 return GetCurrentMonotonicMicros() / 1000;
173 } 173 }
174 174
175 int64_t TimerUtils::GetCurrentTimeMicros() { 175 static int64_t qpc_ticks_per_second = 0;
176 static const int64_t kTimeEpoc = 116444736000000000LL;
177 static const int64_t kTimeScaler = 10; // 100 ns to us.
178 176
179 // Although win32 uses 64-bit integers for representing timestamps, 177 int64_t TimerUtils::GetCurrentMonotonicMicros() {
180 // these are packed into a FILETIME structure. The FILETIME 178 if (qpc_ticks_per_second == 0) {
181 // structure is just a struct representing a 64-bit integer. The 179 // QueryPerformanceCounter not supported, fallback.
182 // TimeStamp union allows access to both a FILETIME and an integer 180 return GetCurrentTimeMicros();
183 // representation of the timestamp. The Windows timestamp is in 181 }
184 // 100-nanosecond intervals since January 1, 1601. 182 // Grab performance counter value.
185 union TimeStamp { 183 LARGE_INTEGER now;
186 FILETIME ft_; 184 QueryPerformanceCounter(&now);
187 int64_t t_; 185 int64_t qpc_value = static_cast<int64_t>(now.QuadPart);
188 }; 186 // Convert to microseconds.
189 TimeStamp time; 187 int64_t seconds = qpc_value / qpc_ticks_per_second;
190 GetSystemTimeAsFileTime(&time.ft_); 188 int64_t leftover_ticks = qpc_value - (seconds * qpc_ticks_per_second);
191 return (time.t_ - kTimeEpoc) / kTimeScaler; 189 int64_t result = seconds * kMicrosecondsPerSecond;
190 result += ((leftover_ticks * kMicrosecondsPerSecond) / qpc_ticks_per_second);
191 return result;
192 }
193
194
195 void* OS::AlignedAllocate(intptr_t size, intptr_t alignment) {
196 const int kMinimumAlignment = 16;
197 ASSERT(Utils::IsPowerOfTwo(alignment));
198 ASSERT(alignment >= kMinimumAlignment);
199 void* p = _aligned_malloc(size, alignment);
200 if (p == NULL) {
201 UNREACHABLE();
202 }
203 return p;
192 } 204 }
193 205
194 void TimerUtils::Sleep(int64_t millis) { 206 void TimerUtils::Sleep(int64_t millis) {
195 ::Sleep(millis); 207 ::Sleep(millis);
196 } 208 }
197 209
198 } // namespace bin 210 } // namespace bin
199 } // namespace dart 211 } // namespace dart
200 212
201 #endif // defined(TARGET_OS_WINDOWS) 213 #endif // defined(TARGET_OS_WINDOWS)
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