Wait
Wait is a synchronization operation that suspends a thread while releasing an associated lock or monitor, then reacquires it before returning after notification or interruption.
Learn Concurrent Programming with Go
Wait is a condition-variable operation that suspends an execution until the condition variable is signaled or broadcast while coordinating the wait with an associated mutex.
- How it is used
- Coordinates goroutines that must pause until protected shared state reaches a required condition.
- How deep it goes
- Explains atomic unlock-and-suspend behavior, wake-up reacquisition, looped checks, missed signals, and condition-variable waitgroup construction.
- Examples
- Uses a bank balance, a multiplayer-game lobby, missed completion signals, and a custom waitgroup.
- What you can do after
- Apply it via Go's sync.Cond to suspend goroutines safely until shared-state conditions change.
Read how Learn Concurrent Programming with Go explains wait →
100 Go Mistakes and How to Avoid Them
Wait is a sync.Cond method that releases its associated locker, blocks until notification, and reacquires the locker before returning.
- How it is used
- Coordinates goroutines that wait for shared state changes without consuming CPU in a polling loop.
- How deep it goes
- Explains locker release, blocking, reacquisition, predicate loops, and Broadcast through runnable synchronization code.
- Examples
- Uses donation balances, listener goroutines, goal predicates, and updater notifications to demonstrate waiting.
- What you can do after
- Apply it via Go's sync.Cond to replace busy polling when goroutines await shared-state changes.
Read how 100 Go Mistakes and How to Avoid Them explains wait →
Troubleshooting Java, Second Edition
The Java Object.wait method releases the object's monitor and suspends the calling thread until notification or interruption occurs.
- How it is used
- Coordinates producer-consumer threads around an empty or full shared list.
- How deep it goes
- Demonstrates synchronized implementations and profiles waiting overhead, but does not develop wait/notify semantics beyond the scenario.
- Examples
- Uses a bounded list with producer and consumer threads, million-iteration loops, and a runtime increase from about 9 to 50 seconds.
- What you can do after
- Diagnose waiting overhead by sampling execution, inspecting thread details, and comparing lock patterns.
Read how Troubleshooting Java, Second Edition explains wait →
Python Concurrency with asyncio
Condition.wait is a coroutine method that releases an acquired condition lock, waits for notification, and reacquires the lock before returning.
- How it is used
- Coordinates coroutines that must wait for shared-resource conditions or selective notifications while preserving exclusive access.
- How deep it goes
- Explains lock release, blocking, notification, and reacquisition through worker code, but does not descend into implementation internals.
- Examples
- Uses two waiting workers, a delayed notifier, and connection initialization guarded by a state predicate.
- What you can do after
- Apply it via asyncio.Condition to pause workers, receive notifications, and resume protected work after a condition becomes true.
Related concepts
- 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.
- wait/notify approachpart of · A wait/notify approach coordinates threads by suspending them with wait and resuming eligible waiting threads with notification.
- conditionpart of · A condition is a synchronization primitive associated with a lock that allows threads to wait for and signal changes in a shared state.
- Task.Waitcontrasts with · Task.Wait is a .NET method that synchronously blocks until a task completes and reports unsuccessful completion through an exception.
These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.