[exec.unstoppable]

# 33 Execution control library [[exec]](./#exec)

## 33.9 Senders [[exec.snd]](exec.snd#exec.unstoppable)

### 33.9.12 Sender adaptors [[exec.adapt]](exec.adapt#exec.unstoppable)

#### 33.9.12.4 execution​::​unstoppable [exec.unstoppable]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L3210)

unstoppable is a sender adaptor
that connects its inner sender
with a receiver that has the execution environment of the outer receiver
but with an object of type never_stop_token as the result of the get_stop_token query[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L3217)

For a subexpression sndr,unstoppable(sndr) is expression-equivalent towrite_env(sndr, prop(get_stop_token, never_stop_token{}))[.](#2.sentence-1)