Returns a timestamp in microseconds (1/1'000'000th of a second) as an integer (64bit). A typical use case is the exact measurement of time intervals, e.g. for profiling and logging purposes.
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The time stamp is calculated in microseconds beginning at the Unix epoch.
It's not guarantied that a time stamp is unique. On a sufficiently fast machine it is possible to retrieve two identical time stamps. In some cases, the utility function getSequenceNumber() may be the better solution. |