What is Condition variable?

A synchronization mechanism that puts a thread to sleep until a condition holds and wakes it on a signal from another thread. The condition must be rechecked after waking.

Field: Multicore & Synchronization

Condition variable in the explanations

Waiting on a condition variable releases the lock and sleeps; when signaled, the thread reacquires the lock and returns.
When waiting on a condition variable until a queue becomes …

Questions that mention Condition variable (1)

When waiting on a condition variable until a queue becomes non-empty, why is the condition rechecked in a while loop rather than an if after waking?

Related terms

ABA problem Acquire-release semantics Atomic instruction Barrier synchronization Bus snooping Compare-and-swap Critical section Data race Deadlock Directory-based coherence

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