alPendingEvents - Get total number of event queued in event queue
int alPendingEvents(ALeventQueue eventq)
eventq expects a valid ALeventQueue initialized by
alPendingEvents(3dm) Returns the total number of events queued up in
eventq. If the event queue is empty, it returns 0.
Upon successful completion, alPendingEvents will return an int value with
the number of events queued in eventq. Otherwise, alPendingEvents
returns -1 and sets an error number which can be retrieved with
alPendingEvents can fail for the following reason:
AL_BAD_INVALID_EVENTQ eventq is either invalid or null.
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