This function provides a single operation that sets (to signaled) the state of the specified event object and then resets it (to nonsignaled) after releasing the appropriate number of waiting threads.
At a Glance
| Header file: | Kfuncs.h |
| Versions: | 1.0 and later |
Syntax
BOOL PulseEvent(HANDLE hEvent);
Parameters
hEvent
Handle to the event object. The CreateEvent function returns this handle.
Return Values
Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.
Remarks
For a manual-reset event object, all waiting threads that can be released immediately are released. The function then resets the event object’s state to nonsignaled and returns.
For an auto-reset event object, the function resets the state to nonsignaled and returns after releasing a single waiting thread, even if multiple threads are waiting.
If no threads are waiting, or if no thread can be released immediately, PulseEvent simply sets the event object’s state to nonsignaled and returns.
Note that for a thread using the multiple-object wait functions to wait for all specified objects to be signaled, PulseEvent can set the event object’s state to signaled and reset it to nonsignaled without causing the wait function to return. This happens if not all of the specified objects are simultaneously signaled.
See Also