Sync.Cond
sync.Cond is a Go standard-library condition-variable type that coordinates waiting and signaling among goroutines using a sync.Locker.
100 Go Mistakes and How to Avoid Them
sync.Cond is a Go synchronization type that coordinates goroutines waiting for a condition associated with a locker.
- How it is used
- Coordinates goroutines waiting for different conditions on shared state, especially when one update must notify multiple listeners.
- How deep it goes
- Explains busy-loop and channel alternatives before showing a complete sync.Cond implementation with locking, waiting, and broadcasting.
- Examples
- Uses donation balances, $10 and $15 goals, busy polling, shared-channel delivery, and Broadcast-based waiting.
- What you can do after
- Apply it via sync.Cond to notify multiple goroutines whenever shared state changes.
Read how 100 Go Mistakes and How to Avoid Them explains sync.Cond →
Learn Concurrent Programming with Go
The Go standard-library condition-variable type that coordinates waiting and signaling through a sync.Locker.
- How it is used
- Coordinates goroutines waiting for shared state to satisfy a condition, such as having enough money to spend.
- How deep it goes
- Explains the API and guarded wait-signal pattern, including atomic unlock-and-suspend behavior, but avoids implementation internals.
- Examples
- Uses Stingy and Spendy goroutines to coordinate deposits and spending through a shared bank balance.
- What you can do after
- Build it from scratch using sync.NewCond, Locker methods, Wait, Signal, and a mutex-protected condition loop.
Read how Learn Concurrent Programming with Go explains sync.Cond →
Related concepts
- condition variableimplements · 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.
- goroutineuses · A goroutine is a lightweight function execution unit managed by the Go runtime that runs concurrently with other program activity.
- Broadcastuses · Broadcast is a sync.Cond method that wakes all goroutines currently waiting on the condition.
- busy-waiting loopaddresses · A busy-waiting loop repeatedly checks a condition while actively consuming processor resources instead of blocking or relinquishing control.
- channelalternative to · A channel is a medium, mechanism, or pathway through which information or messages are conveyed between participants or endpoints.
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