Merge "Add docs to SystemClock.h" am: 0d4089cb1c
Original change: https://android-review.googlesource.com/c/platform/system/core/+/1603259 MUST ONLY BE SUBMITTED BY AUTOMERGER Change-Id: Ibc4f3675aef646a2f8fa9e0dcc4cd0cdc56292fd
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#include <stdint.h>
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#include <sys/types.h>
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// See https://developer.android.com/reference/android/os/SystemClock
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// to learn more about Android's timekeeping facilities.
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namespace android {
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// Returns milliseconds since boot, not counting time spent in deep sleep.
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int64_t uptimeMillis();
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// Returns nanoseconds since boot, not counting time spent in deep sleep.
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int64_t uptimeNanos();
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// Returns milliseconds since boot, including time spent in sleep.
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int64_t elapsedRealtime();
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// Returns nanoseconds since boot, including time spent in sleep.
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int64_t elapsedRealtimeNano();
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} // namespace android
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