# Server.signal(_:)

- **Module:** Server
- **Package:** libtmux-swift
- **Language:** Swift
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-swift/blob/254f8b2be7eb60cacc3ffcb3ea8e456784f582df/Sources/LibTmux/Wait.swift#L54
- **Page:** https://libtmux.org/en/swift/latest/reference/server-signal(_-)/

```
Server.signal(_:)(channel: String) -> ()
```

Releases one waiter on `channel`.

Signalling a channel nobody is waiting on does not queue: it leaves the
channel ready, so the next wait returns at once and spends it. A second
signal puts the channel back rather than storing a second release, so
an unpaired signal is worth avoiding — what a later wait does depends
on how many went unmatched, not how many were sent.

## Raises

- `TmuxError`