KITFORMA · EDITORIAL ANSWER
Why can condition_variable.wait wake before work is ready?
KitForma editorial guide. A notification is not a stored permission, and waits can return without the application predicate being satisfied. Treating wakeup alone as readiness races with other consumers.
Step-by-step answer
A notification is not a stored permission, and waits can return without the application predicate being satisfied. Treating wakeup alone as readiness races with other consumers.
Protect the shared predicate with the same mutex and use the predicate overload, such as
cv.wait(lock, [&]{ return ready || stopping; });. Update state under its synchronization policy and distinguish shutdown from work availability. Do not read the protected flag unsafely outside the lock.
Test notification before waiting, competing consumers and shutdown with no work. A timeout also needs a predicate check. The mutex and predicate establish correctness; adding arbitrary sleeps only changes the race timing.Sources and verification
Sources checked:
Scope: This editorial guide is based on the cited sources and tool behavior. A forum question or a query observed for our site does not establish market search volume, low competition, guaranteed rankings or inadequate answers elsewhere.
This editorial answer was prepared by KitForma with AI assistance. It is not presented as a real member question or an independent user review. Check the sources and the result with your own file; report corrections in the discussion.