[exec.schedule]

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

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

### 33.9.11 Sender factories [[exec.factories]](exec.factories#exec.schedule)

#### 33.9.11.1 execution​::​schedule [exec.schedule]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L2877)

schedule obtains a schedule sender ([[exec.async.ops]](exec.async.ops "33.3 Asynchronous operations"))
from a scheduler[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L2881)

The name schedule denotes a customization point object[.](#2.sentence-1)

For a subexpression sch,
the expression schedule(sch) is expression-equivalent tosch.schedule()[.](#2.sentence-2)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L2887)

*Mandates*: The type of sch.schedule() satisfies [sender](exec.snd.concepts#concept:sender "33.9.3 Sender concepts [exec.snd.concepts]")[.](#3.sentence-1)

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L2891)

If the expressionget_completion_scheduler<set_value_t>(get_env(sch.schedule())) == sch is ill-formed or evaluates to false,
the behavior of calling schedule(sch) is undefined[.](#4.sentence-1)