Close function
In Go, close is a built-in function that marks a channel closed, preventing further sends and allowing receivers to detect completion.
Learn Go with Pocket-Sized Projects
The close function is a Go built-in that marks a channel as closed so that no more values can be sent on it and receivers can detect completion.
- How it is used
- Uses channel closure to signal completed goroutines, end channel listening, and notify multiple maze-solving workers to quit.
- How deep it goes
- Explains reads after closure, zero values, two-value receives, and shutdown patterns; does not examine runtime internals.
- Examples
- Shows a buffered completion channel and a concurrent maze solver whose workers stop through a quit channel.
- What you can do after
- Practice/perform channel closure to notify waiting goroutines and distinguish completion from a sent zero value.
Read how Learn Go with Pocket-Sized Projects explains close function →
Learn Concurrent Programming with Go
close is a Go built-in function that marks a channel as closed so that no further values can be sent to it.
- How it is used
- Signals that a channel has no more values and lets receivers terminate cleanly.
- How deep it goes
- Explains closure, post-closure reads, the open flag, range loops, and pipeline flushing, but not channel implementation internals.
- Examples
- Uses integer messages, comma-ok receives, range loops, and a longest-words pipeline that flushes results on closure.
- What you can do after
- Apply it by closing channels after final sends and stopping receivers with the open flag or a range loop.
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Go in Practice, Second Edition
The Go close function marks a channel as unable to accept further sent values and enables receivers to observe that it is closed.
- How it is used
- Coordinates graceful shutdown between goroutines communicating through channels.
- How deep it goes
- Explains send-after-close panics, zero-value receives, comma-ok detection, and a done-channel shutdown pattern.
- Examples
- Uses timeout-driven programs, an improper close panic, comma-ok reception, and a done-channel implementation.
- What you can do after
- Apply it via coordinated sender-side closure and diagnose panics caused by sends racing with closure.
Read how Go in Practice, Second Edition explains close function →
Related concepts
- closed channelproduces · A closed channel is a Go channel that accepts no further sends while allowing receives to complete, including delivery of buffered values.
- deferused by · Defer is a language feature that schedules an operation to execute when the surrounding function or scope exits, including during exceptional unwinding.
- channelused by · A channel is a medium, mechanism, or pathway through which information or messages are conveyed between participants or endpoints.
- channelconfigures · A channel is a typed Go communication and synchronization mechanism through which goroutines send and receive values.
- range clauseaddresses · A range clause iterates over elements of an array, slice, map, or channel and assigns the iteration results to loop variables.
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