Since your thread is in an alertable state, as soon as an APC entry appears, the system wakes your thread and empties the queue (by calling the callback routines).
Source: wiktionary
Alertable
Synonyms for "alertable"
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If you know the HANDLE of a thread you wish to signal, and that thread has performed an alertable wait, then queueing an APC is often significantly quicker than waking the target thread by using kernel objects (as we are about to review).
Source: wiktionary
Every thread has a queue of APCs attached to it, and these are processed when the thread is in an alertable state, such as when they call functions like WaitForSingleObjectEx, WaitForMultipleObjectsEx, and Sleep.
Source: wiktionary
Bids marked in red on the convention card must be alerted. Cue-bids of an opponent's suit, however, are not alertable.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.