# Libtmux_unix.Subscription.next

- **Module:** Libtmux_unix
- **Package:** libtmux-unix
- **Language:** OCaml
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-ocaml/blob/205dfda49742592b479247049d186956e4a4cfe9/unix/libtmux_unix.mli#L157
- **Public owner:** Libtmux_unix
- **Page:** https://libtmux.org/en/ocaml/latest/reference/libtmux_unix-subscription-next/

```
val next :
  ?cancel:Cancellation.t ->
  ?timeout:float ->
  t -> (Libtmux.Output.event option, Libtmux.Error.t) result
```

Pump all subscription lanes until one event is available. Default deadline is one second. `None` follows a consumed End. A deadline keeps the subscription active; cancellation closes it and raises Cancelled.

## Parameters

- `cancel?` (`Cancellation.t`)
- `timeout?` (`float`)
- `arg1` (`t`)