As one example, some clocks are cpu specific (rather than system specific). When a thread gets scheduled to a different cpu, it might be talking to a different clock, and getting a backwards time.
The user might also be changing the clock while the program is running, of course.
If the forward direction of time is important, make sure the the source of time is a monotonic clock API.
As one example, some clocks are cpu specific (rather than system specific). When a thread gets scheduled to a different cpu, it might be talking to a different clock, and getting a backwards time.
The user might also be changing the clock while the program is running, of course.
If the forward direction of time is important, make sure the the source of time is a monotonic clock API.