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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 // QuicTime represents one point in time, stored in microsecond resolution. | 5 // QuicTime represents one point in time, stored in microsecond resolution. |
6 // QuicTime is monotonically increasing, even across system clock adjustments. | 6 // QuicTime is monotonically increasing, even across system clock adjustments. |
7 // The epoch (time 0) of QuicTime is unspecified. | 7 // The epoch (time 0) of QuicTime is unspecified. |
8 // | 8 // |
9 // This implementation wraps the classes base::TimeTicks and base::TimeDelta. | 9 // This implementation wraps the classes base::TimeTicks and base::TimeDelta. |
10 | 10 |
11 #ifndef NET_QUIC_CORE_QUIC_TIME_H_ | 11 #ifndef NET_QUIC_CORE_QUIC_TIME_H_ |
12 #define NET_QUIC_CORE_QUIC_TIME_H_ | 12 #define NET_QUIC_CORE_QUIC_TIME_H_ |
13 | 13 |
14 #include <stdint.h> | 14 #include <stdint.h> |
15 | 15 |
16 #include <cmath> | 16 #include <cmath> |
17 #include <ostream> | 17 #include <ostream> |
18 | 18 |
19 #include "base/compiler_specific.h" | 19 #include "base/compiler_specific.h" |
20 #include "base/time/time.h" | 20 #include "base/time/time.h" |
21 #include "net/base/net_export.h" | 21 #include "net/quic/platform/api/quic_export.h" |
22 | 22 |
23 #define QUICTIME_CONSTEXPR inline | 23 #define QUICTIME_CONSTEXPR inline |
24 | 24 |
25 namespace net { | 25 namespace net { |
26 | 26 |
27 // A QuicTime is a purely relative time. QuicTime values from different clocks | 27 // A QuicTime is a purely relative time. QuicTime values from different clocks |
28 // cannot be compared to each other. If you need an absolute time, see | 28 // cannot be compared to each other. If you need an absolute time, see |
29 // QuicWallTime, below. | 29 // QuicWallTime, below. |
30 class NET_EXPORT_PRIVATE QuicTime { | 30 class QUIC_EXPORT_PRIVATE QuicTime { |
31 public: | 31 public: |
32 // A QuicTime::Delta represents the signed difference between two points in | 32 // A QuicTime::Delta represents the signed difference between two points in |
33 // time, stored in microsecond resolution. | 33 // time, stored in microsecond resolution. |
34 class NET_EXPORT_PRIVATE Delta { | 34 class QUIC_EXPORT_PRIVATE Delta { |
35 public: | 35 public: |
36 explicit Delta(base::TimeDelta delta); | 36 explicit Delta(base::TimeDelta delta); |
37 | 37 |
38 // Create a object with an offset of 0. | 38 // Create a object with an offset of 0. |
39 static QUICTIME_CONSTEXPR Delta Zero() { return Delta(0); } | 39 static QUICTIME_CONSTEXPR Delta Zero() { return Delta(0); } |
40 | 40 |
41 // Create a object with infinite offset time. | 41 // Create a object with infinite offset time. |
42 static QUICTIME_CONSTEXPR Delta Infinite() { | 42 static QUICTIME_CONSTEXPR Delta Infinite() { |
43 return Delta(kQuicInfiniteTimeUs); | 43 return Delta(kQuicInfiniteTimeUs); |
44 } | 44 } |
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131 friend inline QuicTime::Delta operator-(QuicTime lhs, QuicTime rhs); | 131 friend inline QuicTime::Delta operator-(QuicTime lhs, QuicTime rhs); |
132 | 132 |
133 explicit QUICTIME_CONSTEXPR QuicTime(int64_t time) : time_(time) {} | 133 explicit QUICTIME_CONSTEXPR QuicTime(int64_t time) : time_(time) {} |
134 | 134 |
135 int64_t time_; | 135 int64_t time_; |
136 }; | 136 }; |
137 | 137 |
138 // A QuicWallTime represents an absolute time that is globally consistent. In | 138 // A QuicWallTime represents an absolute time that is globally consistent. In |
139 // practice, clock-skew means that comparing values from different machines | 139 // practice, clock-skew means that comparing values from different machines |
140 // requires some flexibility. | 140 // requires some flexibility. |
141 class NET_EXPORT_PRIVATE QuicWallTime { | 141 class QUIC_EXPORT_PRIVATE QuicWallTime { |
142 public: | 142 public: |
143 // FromUNIXSeconds constructs a QuicWallTime from a count of the seconds | 143 // FromUNIXSeconds constructs a QuicWallTime from a count of the seconds |
144 // since the UNIX epoch. | 144 // since the UNIX epoch. |
145 static QUICTIME_CONSTEXPR QuicWallTime FromUNIXSeconds(uint64_t seconds) { | 145 static QUICTIME_CONSTEXPR QuicWallTime FromUNIXSeconds(uint64_t seconds) { |
146 return QuicWallTime(seconds * 1000000); | 146 return QuicWallTime(seconds * 1000000); |
147 } | 147 } |
148 | 148 |
149 static QUICTIME_CONSTEXPR QuicWallTime | 149 static QUICTIME_CONSTEXPR QuicWallTime |
150 FromUNIXMicroseconds(uint64_t microseconds) { | 150 FromUNIXMicroseconds(uint64_t microseconds) { |
151 return QuicWallTime(microseconds); | 151 return QuicWallTime(microseconds); |
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265 | 265 |
266 // Override stream output operator for gtest. | 266 // Override stream output operator for gtest. |
267 inline std::ostream& operator<<(std::ostream& output, | 267 inline std::ostream& operator<<(std::ostream& output, |
268 const QuicTime::Delta delta) { | 268 const QuicTime::Delta delta) { |
269 output << delta.ToDebugValue(); | 269 output << delta.ToDebugValue(); |
270 return output; | 270 return output; |
271 } | 271 } |
272 } // namespace net | 272 } // namespace net |
273 | 273 |
274 #endif // NET_QUIC_CORE_QUIC_TIME_H_ | 274 #endif // NET_QUIC_CORE_QUIC_TIME_H_ |
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