| /* |
| * Copyright 2005 The WebRTC Project Authors. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef WEBRTC_BASE_TIMEUTILS_H_ |
| #define WEBRTC_BASE_TIMEUTILS_H_ |
| |
| #include <ctime> |
| #include <time.h> |
| |
| #include "webrtc/base/basictypes.h" |
| |
| namespace rtc { |
| |
| static const int64_t kNumMillisecsPerSec = INT64_C(1000); |
| static const int64_t kNumMicrosecsPerSec = INT64_C(1000000); |
| static const int64_t kNumNanosecsPerSec = INT64_C(1000000000); |
| |
| static const int64_t kNumMicrosecsPerMillisec = |
| kNumMicrosecsPerSec / kNumMillisecsPerSec; |
| static const int64_t kNumNanosecsPerMillisec = |
| kNumNanosecsPerSec / kNumMillisecsPerSec; |
| static const int64_t kNumNanosecsPerMicrosec = |
| kNumNanosecsPerSec / kNumMicrosecsPerSec; |
| |
| // TODO(honghaiz): Define a type for the time value specifically. |
| |
| class ClockInterface { |
| public: |
| virtual ~ClockInterface() {} |
| virtual uint64_t TimeNanos() const = 0; |
| }; |
| |
| // Sets the global source of time. This is useful mainly for unit tests. |
| // |
| // Returns the previously set ClockInterface, or nullptr if none is set. |
| // |
| // Does not transfer ownership of the clock. SetClockForTesting(nullptr) |
| // should be called before the ClockInterface is deleted. |
| // |
| // This method is not thread-safe; it should only be used when no other thread |
| // is running (for example, at the start/end of a unit test, or start/end of |
| // main()). |
| // |
| // TODO(deadbeef): Instead of having functions that access this global |
| // ClockInterface, we may want to pass the ClockInterface into everything |
| // that uses it, eliminating the need for a global variable and this function. |
| ClockInterface* SetClockForTesting(ClockInterface* clock); |
| |
| // Returns the actual system time, even if a clock is set for testing. |
| // Useful for timeouts while using a test clock, or for logging. |
| uint64_t SystemTimeNanos(); |
| int64_t SystemTimeMillis(); |
| |
| // Returns the current time in milliseconds in 32 bits. |
| uint32_t Time32(); |
| |
| // Returns the current time in milliseconds in 64 bits. |
| int64_t TimeMillis(); |
| // Deprecated. Do not use this in any new code. |
| inline int64_t Time() { |
| return TimeMillis(); |
| } |
| |
| // Returns the current time in microseconds. |
| uint64_t TimeMicros(); |
| |
| // Returns the current time in nanoseconds. |
| uint64_t TimeNanos(); |
| |
| // Returns a future timestamp, 'elapsed' milliseconds from now. |
| int64_t TimeAfter(int64_t elapsed); |
| |
| // Number of milliseconds that would elapse between 'earlier' and 'later' |
| // timestamps. The value is negative if 'later' occurs before 'earlier'. |
| int64_t TimeDiff(int64_t later, int64_t earlier); |
| int32_t TimeDiff32(uint32_t later, uint32_t earlier); |
| |
| // The number of milliseconds that have elapsed since 'earlier'. |
| inline int64_t TimeSince(int64_t earlier) { |
| return TimeMillis() - earlier; |
| } |
| |
| // The number of milliseconds that will elapse between now and 'later'. |
| inline int64_t TimeUntil(uint64_t later) { |
| return later - TimeMillis(); |
| } |
| |
| class TimestampWrapAroundHandler { |
| public: |
| TimestampWrapAroundHandler(); |
| |
| int64_t Unwrap(uint32_t ts); |
| |
| private: |
| uint32_t last_ts_; |
| int64_t num_wrap_; |
| }; |
| |
| // Convert from std::tm, which is relative to 1900-01-01 00:00 to number of |
| // seconds from 1970-01-01 00:00 ("epoch"). Don't return time_t since that |
| // is still 32 bits on many systems. |
| int64_t TmToSeconds(const std::tm& tm); |
| |
| } // namespace rtc |
| |
| #endif // WEBRTC_BASE_TIMEUTILS_H_ |