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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 // Time represents an absolute point in time, internally represented as | 5 // Time represents an absolute point in time, internally represented as |
| 6 // microseconds (s/1,000,000) since a platform-dependent epoch. Each | 6 // microseconds (s/1,000,000) since a platform-dependent epoch. Each |
| 7 // platform's epoch, along with other system-dependent clock interface | 7 // platform's epoch, along with other system-dependent clock interface |
| 8 // routines, is defined in time_PLATFORM.cc. | 8 // routines, is defined in time_PLATFORM.cc. |
| 9 // | 9 // |
| 10 // TimeDelta represents a duration of time, internally represented in | 10 // TimeDelta represents a duration of time, internally represented in |
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| 252 static Time FromDoubleT(double dt); | 252 static Time FromDoubleT(double dt); |
| 253 double ToDoubleT() const; | 253 double ToDoubleT() const; |
| 254 | 254 |
| 255 #if defined(OS_POSIX) | 255 #if defined(OS_POSIX) |
| 256 struct timeval ToTimeVal() const; | 256 struct timeval ToTimeVal() const; |
| 257 #endif | 257 #endif |
| 258 | 258 |
| 259 #if defined(OS_WIN) | 259 #if defined(OS_WIN) |
| 260 static Time FromFileTime(FILETIME ft); | 260 static Time FromFileTime(FILETIME ft); |
| 261 FILETIME ToFileTime() const; | 261 FILETIME ToFileTime() const; |
| 262 static Time FromLargeInteger(LARGE_INTEGER li); |
| 262 | 263 |
| 263 // The minimum time of a low resolution timer. This is basically a windows | 264 // The minimum time of a low resolution timer. This is basically a windows |
| 264 // constant of ~15.6ms. While it does vary on some older OS versions, we'll | 265 // constant of ~15.6ms. While it does vary on some older OS versions, we'll |
| 265 // treat it as static across all windows versions. | 266 // treat it as static across all windows versions. |
| 266 static const int kMinLowResolutionThresholdMs = 16; | 267 static const int kMinLowResolutionThresholdMs = 16; |
| 267 | 268 |
| 268 // Enable or disable Windows high resolution timer. If the high resolution | 269 // Enable or disable Windows high resolution timer. If the high resolution |
| 269 // timer is not enabled, calls to ActivateHighResolutionTimer will fail. | 270 // timer is not enabled, calls to ActivateHighResolutionTimer will fail. |
| 270 // When disabling the high resolution timer, this function will not cause | 271 // When disabling the high resolution timer, this function will not cause |
| 271 // the high resolution timer to be deactivated, but will prevent future | 272 // the high resolution timer to be deactivated, but will prevent future |
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| 540 #endif | 541 #endif |
| 541 }; | 542 }; |
| 542 | 543 |
| 543 inline TimeTicks TimeDelta::operator+(TimeTicks t) const { | 544 inline TimeTicks TimeDelta::operator+(TimeTicks t) const { |
| 544 return TimeTicks(t.ticks_ + delta_); | 545 return TimeTicks(t.ticks_ + delta_); |
| 545 } | 546 } |
| 546 | 547 |
| 547 } // namespace base | 548 } // namespace base |
| 548 | 549 |
| 549 #endif // BASE_TIME_H_ | 550 #endif // BASE_TIME_H_ |
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