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CancelWaitableTimer info  Overview  Group

The CancelWaitableTimer function sets the specified “waitable” timer to the inactive state.

BOOL CancelWaitableTimer(

    HANDLE hTimer

// handle to a timer object




Identifies the timer object. The CreateWaitableTimer or OpenWaitableTimer function returns this handle.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


The CancelWaitableTimer function does not change the signaled state of the timer. It stops the timer before it can be set to the signaled state. Therefore, threads performing a wait operation on the timer remain waiting until they time out or the timer is reactivated and its state is set to signaled.

To reactivate the timer, call the SetWaitableTimer function.

See Also

CreateWaitableTimer, OpenWaitableTimer, SetWaitableTimer 

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