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