KITFORMA · EDITORIAL GUIDE
Why must a Java condition wait recheck its predicate after waking?
KitForma editorial guide. A wakeup is permission to check shared state again, not proof that the desired condition is now true. Another worker may have consumed the available work.
Step-by-step guidance
A wakeup is permission to check shared state again, not proof that the desired condition is now true. Another worker may have consumed the available work.
Hold the associated lock and wait in a loop:
while (queue.isEmpty()) condition.await();. Change the predicate under the same synchronization discipline and signal after the relevant state transition. Always release the lock in finally. Prefer an existing blocking queue when that matches the problem instead of rebuilding its coordination protocol.
Test multiple waiting consumers and cancellation. A single producer/consumer example may hide the bug. The loop also accommodates spurious wakeups, but it cannot repair a predicate read outside the lock or a signal sent without updating state.Sources and verification
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