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ITsVISTA KB-Link: KB2028281

WaitForSingleObject API may not time-out at a specified time.

Consider this scenario:

  • You use a Windows Vista based computer and the computer supports HPET.
  • Any time synchronization service such as Windows Timer Services is not used.
  • The API such as WaitForSingleObject is used to timeout at a specified time.
  • Get the system time immediately after WaitForSingleObject API returns.

WaitForSingleObject API is expected to time-out at the specified time. But the system time obtained at this point may not have reached the specified time.

Example:
In WaitForSingleObject API, set the parameter so that timeout will occur at 09:00:00 in the next morning. Now, when WaitForSingleObject API is expired, the obtained time may be 08:59:59.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2028281.

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