Cnd_timedwait
cnd_timedwait is a C threads-library function that atomically releases a mutex while waiting on a condition variable, then reacquires it after notification or an absolute timeout.
Modern C, Third Edition
cnd_timedwait is a C threads-library function that atomically releases a mutex while waiting for a condition variable and returns when signaled or when an absolute time limit is reached.
- How it is used
- Coordinates accounting, update, and drawing threads while limiting how long each condition wait lasts.
- How deep it goes
- Explains deadline construction, predicate rechecks, liveness reasoning, and the wait’s mutex release-and-acquire behavior.
- Examples
- Uses a one-second `life_wait` wrapper and accounting, update, and drawing wait loops.
- What you can do after
- Apply it via the C threads library to time-limit waits, recheck predicates, and reason about progress.
Modern C
cnd_timedwait is a C standard threads function that atomically releases a mutex while waiting on a condition variable until notification or an absolute timeout, then reacquires the mutex.
- How it is used
- Coordinates worker threads that should sleep until work arrives, the game finishes, or a frame-rate-oriented timeout expires.
- How deep it goes
- Explains arguments, absolute deadlines, mutex association, and predicate rechecking, but defers implementation internals.
- Examples
- Uses a one-second life_wait helper and accounting, update, and drawing thread predicates.
- What you can do after
- Apply it via C threads by supplying a condition variable, locked mutex, and absolute timespec deadline inside a predicate loop.
Related concepts
- lockinguses · Locking is a concurrency-control technique that restricts access to a shared resource or protected operation to prevent conflicting concurrent access.
- condition variableuses · A condition variable is a synchronization object that allows threads to wait for a shared-state condition and be notified when it may have changed.
- cnd_waitalternative to · cnd_wait is a C threads-library function that atomically releases a mutex while waiting on a condition variable and reacquires it before returning.
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